LIVIVO - Das Suchportal für Lebenswissenschaften

switch to English language
Zurück zur letzten Suche Suchhistorie
Erweiterte Suche

Ihre letzten Suchen

  1. AU="HE Xiufeng"
  2. AU=Freeman Hugh J AU=Freeman Hugh J
  3. AU="Choi, John Kim"
  4. AU="Streng, Bianca M M"
  5. AU="Franklin, Renty B"
  6. AU="Tetri, Laura H"
  7. AU="Badve, Sunil V"
  8. AU=Zhang Yinan
  9. AU="Piquero, Nicole Leeper"
  10. AU="Russo, Giorgio Ivan" AU="Russo, Giorgio Ivan"
  11. AU=Pourdowlat Guitti
  12. AU="Frisenda, Riccardo"
  13. AU=Palmucci Stefano

Suchergebnis

Treffer 1 - 10 von insgesamt 65

Suchoptionen

  1. Artikel ; Online: Monitoring of coastal sedimentation changes based on GNSS and GNSS-IR

    WANG Xiaolei / NIU Zijin / HE Xiufeng / LI Runchuan

    Acta Geodaetica et Cartographica Sinica, Vol 52, Iss 1, Pp 32-

    2023  Band 40

    Abstract: Coastal settlement monitoring usually uses the Global Navigation Satellite System (GNSS) positioning technology to measure at present. However, it only reflects the sediment settlement below the station base, and the settlement information above the ... ...

    Abstract Coastal settlement monitoring usually uses the Global Navigation Satellite System (GNSS) positioning technology to measure at present. However, it only reflects the sediment settlement below the station base, and the settlement information above the station base cannot be obtained. In coastal areas, sediments accumulate rapidly, and settlement changes greatly under compaction and alluvium. Therefore, it is necessary to monitor the settlement above the base in order to obtain the overall coastal settlement information. With the continuous development of GNSS, a new GNSS interactive reflectometry (GNSS-IR) technology has been proved to be able to use multipath effect for reflector height monitoring. Because the base of GNSS station is deep and the base length remains unchanged, the ground height change obtained by GNSS-IR technology can reflect the settlement above the base. Therefore, the paper use GNSS-IR technology to measure the subsidence changes above the base; At the same time, the settlement below the base change is obtained by using GNSS positioning technology, and then the total settlement change is obtained by using GNSS-IR and GNSS positioning technology. The Mississippi River Delta with large sediment thickness is selected as the test area, and the data of FSHS, GRIS and MSIN stations are selected for analysis. The results show that GNSS-IR can be used to measure the settlement rate above the base, and the corrected total settlement rate is equivalent to the relative sea level rise rate, which can better estimate the flood susceptibility and land loss.
    Schlagwörter gnss-ir ; gnss positioning ; coastal sedimentation changes ; subsidence changes above the base ; total sedimentation changes ; Mathematical geography. Cartography ; GA1-1776
    Thema/Rubrik (Code) 550
    Sprache Chinesisch
    Erscheinungsdatum 2023-01-01T00:00:00Z
    Verlag Surveying and Mapping Press
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

    Zusatzmaterialien

    Kategorien

    Fernleihe an ZB MED

    Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

  2. Artikel: New insights into the 2020 Sardoba dam failure in Uzbekistan from Earth observation

    Xiao, Ruya / Jiang, Mi / Li, Zhenhong / He, Xiufeng

    International journal of applied earth observation and geoinformation. 2022 Mar., v. 107

    2022  

    Abstract: On 1 May 2020, the Sardoba Reservoir in Uzbekistan breached its western wall, and the uncontrolled release of water caused casualties, environmental damages and economic losses. We investigate the dam failure based on three sets of Earth observation data, ...

    Abstract On 1 May 2020, the Sardoba Reservoir in Uzbekistan breached its western wall, and the uncontrolled release of water caused casualties, environmental damages and economic losses. We investigate the dam failure based on three sets of Earth observation data, including: (i) satellite altimetry products, i.e., ICESat-2 data, with the aim of understanding the topographic features in the study area; (ii) multi-geometry Sentinel-1 SAR data to retrieve the pre-failure deformation along the vertical and horizontaleast-west directions between 2017 and 2020; (iii) optical images from Sentinel-2 satellites and Global Precipitation Measurement (GPM) products, which are involved in exploring the environmental status before the failure. We analyse the possible causes of the collapse in terms of both physical and human factors. The differential settlement of ∼60 mm revealed by InSAR at the failure section is a sign of internal erosion through the embankment, which is the physical factor contributing to the failure. The opportunity to prevent the collapse were missed due to the human factor of ignorance brought by limitations of the conventional monitoring methods. Neither ground observations nor satellite-based GPM products show extreme precipitation in the region, ruling out the likelihood of rainfall-induced overtopping. The settlement rate of the embankment shows no decaying trend, indicating that the dam is undergoing the primary consolidation phase of total settlement. Maximum settlement of ∼270 mm (∼0.8% of the dam height) has happened on the north bank since the reservoir impoundment, which should raise concern in future monitoring and surveillance. The results reveal that InSAR can discern the failure precursor by detecting surface motion, and that the deformation signals can help to warn of risks and avoid dam damage. We recommend InSAR deformation monitoring be included in future safety programs, providing detailed deformation and resisting risks of ignorance.
    Schlagwörter deformation ; humans ; monitoring ; satellite altimetry ; satellites ; spatial data ; topography ; Uzbekistan
    Sprache Englisch
    Erscheinungsverlauf 2022-03
    Erscheinungsort Elsevier B.V.
    Dokumenttyp Artikel
    ISSN 1569-8432
    DOI 10.1016/j.jag.2022.102705
    Datenquelle NAL Katalog (AGRICOLA)

    Volltext online

    Zusatzmaterialien

    Kategorien

    Über subito bestellen

    Dieser Service ist kostenpflichtig (siehe Lieferbedingungen von subito). Bestellungen, die einen Artikel nebst Supplementary Material umfassen, werden grundsätzlich wie mehrfache Bestellungen bearbeitet. Gebühren fallen in diesen Fällen für jede einzelne Bestellung an.

    Fernleihe an ZB MED

    Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

  3. Artikel ; Online: A GNSS water vapor tomography method considering boundary signals and vertical constraint

    HE Xiufeng / ZHAN Wei / SHI Hongkai

    Acta Geodaetica et Cartographica Sinica, Vol 50, Iss 7, Pp 853-

    2021  Band 862

    Abstract: GNSS three-dimensional water vapor tomography technology is used to obtain all-weather atmospheric water vapor distribution information with high spatial and temporal resolution. At present, the observation data of the tomographic model considering only ... ...

    Abstract GNSS three-dimensional water vapor tomography technology is used to obtain all-weather atmospheric water vapor distribution information with high spatial and temporal resolution. At present, the observation data of the tomographic model considering only the top signal have low utilization rate and large grid space rate, and the vertical constraint equation adopted is less consistent with the actual water vapor distribution. This paper based on the function fitted with sounding information to establish a vertical constraints, designs and implements a tomographic method considering boundary signals, uses the observation data of Hong Kong CORS network and radio sounding products. The improvement of the results of water vapor tomography by introducing boundary signals and for vertical constraint equation are analyzed in detail. The results show that the addition of boundary signals increases the observation equation by 51.9%, decreases the grid space rate significantly, and reduces the root-mean-square error of the solution results by 12.1%. Compared with the traditional constraint equation based on the exponential decline characteristic in the vertical direction, the root-mean-square error of the vertical constraint solution adopted in this paper is reduced by 5.7%.
    Schlagwörter gnss ; 3d water vapor ; tomography ; boundary incident signals ; vertical constraint ; radiosonde data ; Mathematical geography. Cartography ; GA1-1776
    Thema/Rubrik (Code) 551
    Sprache Chinesisch
    Erscheinungsdatum 2021-07-01T00:00:00Z
    Verlag Surveying and Mapping Press
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

    Zusatzmaterialien

    Kategorien

    Fernleihe an ZB MED

    Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

  4. Artikel ; Online: Geometry-free single-epoch resolution of BDS-3 multi-frequency carrier ambi-guities

    ZHANG Zhetao / LI Bofeng / HE Xiufeng

    Acta Geodaetica et Cartographica Sinica, Vol 49, Iss 9, Pp 1139-

    2020  Band 1148

    Abstract: The BDS-3 navigation satellite system currently provides five-frequency observations, so theoretically it can perform multi-frequency carrier ambiguity resolution (MCAR). This paper systematically studies the basic theory and method of the MCAR, ... ...

    Abstract The BDS-3 navigation satellite system currently provides five-frequency observations, so theoretically it can perform multi-frequency carrier ambiguity resolution (MCAR). This paper systematically studies the basic theory and method of the MCAR, including three-frequency (TCAR), four-frequency (FCAR) and five-frequency (FiCAR) carrier ambiguity resolution. Firstly, from the perspective of linear combination, basic mathematical models including TCAR, FCAR and FiCAR methods are given. Secondly, the high-quality signals and the optimal linear combinations under different conditions of baseline lengths-are discussed. In addition, single-epoch ambiguity resolution using geometry-free model is analyzed. Finally, experiments were conducted using the real BDS-3 five-frequency data. The results showed that the MCAR can effectively fix the ambiguities in single epoch, and the increase of the frequency number can significantly improve the success rates of the ambiguity resolution.
    Schlagwörter bds-3 ; ambiguity resolution ; multi-frequency observations ; geometry-free model ; single epoch ; Mathematical geography. Cartography ; GA1-1776
    Thema/Rubrik (Code) 600
    Sprache Chinesisch
    Erscheinungsdatum 2020-09-01T00:00:00Z
    Verlag Surveying and Mapping Press
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

    Zusatzmaterialien

    Kategorien

    Fernleihe an ZB MED

    Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

  5. Artikel ; Online: Retrieval of coastal typhoon storm surge using multi-GNSS-IR

    HE Xiufeng / WANG Jie / Wang Xiaolei / SONG Minfeng

    Acta Geodaetica et Cartographica Sinica, Vol 49, Iss 9, Pp 1168-

    2020  Band 1178

    Abstract: Typhoon storm surges cause great losses to coastal cities every year. In recent years, a ground-based remote sensing technology using GNSS reflected signal has been proved to be able to monitor tidal level, called global navigation satellite system ... ...

    Abstract Typhoon storm surges cause great losses to coastal cities every year. In recent years, a ground-based remote sensing technology using GNSS reflected signal has been proved to be able to monitor tidal level, called global navigation satellite system interferometric reflectometry (GNSS-IR), which can supplement the data of tide gauge. However, storm surges have strong destructiveness and occur quickly, the time resolution of GPS cannot meet the requirement to monitor this marine disaster. In this paper, three coastal storm surge events were monitored using the multi-mode and multi-frequency GNSS data of HKQT site in Hong Kong, China and BHMA site in Bahamas Islands. Firstly, we analyzed the quality of multiple system data. Then, multi-mode and multi-frequency GNSS-IR was used for monitoring three storm surges caused by hurricane "Dorian" in 2019, typhoon "Mangkhut" in 2018 and typhoon "Hato" in 2017.The sliding window least squares method was used to correct the results and compared with tide gauge observations. The experimental results showed that the accuracy of "Dorian" is better than 14 cm, and the accuracy of "Hato" and "Mangkhut" are both better than 9 cm. Compared with GPS, it could improve the accuracy and the time resolution of the results, which is helpful to record the whole process of tide rising, peak and falling in storm surge. And it can play an important role in the study of marine disasters.
    Schlagwörter gnss-ir ; storm surge ; retrieval ; multiple system ; sea surface ; Mathematical geography. Cartography ; GA1-1776
    Thema/Rubrik (Code) 333
    Sprache Chinesisch
    Erscheinungsdatum 2020-09-01T00:00:00Z
    Verlag Surveying and Mapping Press
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

    Zusatzmaterialien

    Kategorien

    Fernleihe an ZB MED

    Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

  6. Artikel: A Correction Method of Height Variation Error Based on One SNR Arc Applied in GNSS–IR Sea-Level Retrieval

    Wang, Xiaolei / Niu, Zijin / Chen, Shu / He, Xiufeng

    Remote Sensing. 2021 Dec. 21, v. 14, no. 1

    2021  

    Abstract: Sea-level monitoring is important for the safety of coastal cities and analysis of ocean and climate. Sea levels can be estimated based using the global navigation satellite system–interferometry reflectometry (GNSS–IR). The frequency in a signal-to- ... ...

    Abstract Sea-level monitoring is important for the safety of coastal cities and analysis of ocean and climate. Sea levels can be estimated based using the global navigation satellite system–interferometry reflectometry (GNSS–IR). The frequency in a signal-to-noise ratio (SNR) arc has been found to be related to the height between the GNSS antenna and reflecting surface, which is called reflector height (RH, h). The height variation of the reflecting surface causes an error, and this error is the most significant error in the GNSS–IR sea-level retrieval. The key to the correction of height variation error lies in the determination of the RH variation rate h˙. The classical correction method determines h˙ based on tide analysis of a coarse RH series over a longer time period. Therefore, h˙ inherits errors in coarse RH series, which contains significant bias during a storm surge, and correcting this requires data accumulation. This study proposes a correction method of height variation error based on just one SNR arc based on wavelet analysis and least-square estimation. First, using wavelet analysis, instantaneous frequencies are extracted in one SNR arc; these frequencies are then converted to RH series. Second, using least-square estimation, h and h˙ are conjointly solved based on the RH series from wavelet analysis. Data of GNSS site HKQT located in Hong Kong, China, during a period of time that includes Typhoon Hato were used. The root-mean-square errors (RMSEs) of retrievals were 21.5 cm for L1, 9.5 cm for L2P, 9.3 cm for L2C, and 7.6 cm for L5 of GPS; 16.8 cm for L1C, 14.1 cm for L1P, 12.6 cm for L2C, and 10.7 cm for L2P of GLONASS; 15.7 cm for L1, 11.2 cm for L5, 12.2 cm for L7, and 9.6 cm for L8 of Galileo. Results showed this method can correct the height variation error based on just one SNR arc, can avoid the inheritance of errors, and can be used during periods of storm surge.
    Schlagwörter climate ; reflectometry ; satellites ; sea level ; signal-to-noise ratio ; typhoons ; wavelet ; China
    Sprache Englisch
    Erscheinungsverlauf 2021-1221
    Erscheinungsort Multidisciplinary Digital Publishing Institute
    Dokumenttyp Artikel
    ZDB-ID 2513863-7
    ISSN 2072-4292
    ISSN 2072-4292
    DOI 10.3390/rs14010011
    Datenquelle NAL Katalog (AGRICOLA)

    Zusatzmaterialien

    Kategorien

    Über subito bestellen

    Dieser Service ist kostenpflichtig (siehe Lieferbedingungen von subito). Bestellungen, die einen Artikel nebst Supplementary Material umfassen, werden grundsätzlich wie mehrfache Bestellungen bearbeitet. Gebühren fallen in diesen Fällen für jede einzelne Bestellung an.

  7. Artikel: Statistical assessment metrics for InSAR atmospheric correction: Applications to generic atmospheric correction online service for InSAR (GACOS) in Eastern China

    Xiao, Ruya / Yu, Chen / Li, Zhenhong / He, Xiufeng

    International journal of applied earth observation and geoinformation. 2021 Apr., v. 96

    2021  

    Abstract: The atmospheric effect represents one of the major error sources in Interferometric Synthetic Aperture Radar (InSAR), and its mitigation is found crucial for high-precision InSAR applications. Numerous studies on InSAR atmospheric correction methods and ... ...

    Abstract The atmospheric effect represents one of the major error sources in Interferometric Synthetic Aperture Radar (InSAR), and its mitigation is found crucial for high-precision InSAR applications. Numerous studies on InSAR atmospheric correction methods and applications covering a wide range of regions worldwide have been reported with varying degrees of success. However, more efforts on the performance assessment are needed, and the conclusions may lack statistical significance due to the limited interferograms involved in most of these analyses. To optimally utilise different InSAR atmospheric correction methods and avoid potential uncertainty caused, appropriate statistical metrics to assess the correction performance must be set up. In this work, we provide a general guideline for statistical assessment of InSAR atmospheric correction. Based on the physical properties of the atmosphere, three metrics are applied: (i) the phase standard deviation which assesses the overall performance of the correction; (ii) the spatial structure function which evaluates the reduction of the long-wavelength atmospheric effect; and (iii) the phase-elevation correlation coefficient which measures the reduction of the stratified component of the atmospheric delay. The performance of the Generic Atmospheric Correction Online Service for InSAR (GACOS) products for two typical terrains in Eastern China is evaluated. Statistical results of the 1250 Sentinel-1 interferograms covering the Yellow River Delta and Shandong hilly region show that (i) GACOS reduces the interferometric phase standard deviation in 84.6% of the interferograms by an average of 36.4%; (ii) the phase decorrelation distance decreases from 321 km to 225 km on average after correction; and (iii) the mean phase-elevation correlation declines by 33.3% for the areas with considerable topographic variations. The results verify the effectiveness of GACOS products in Eastern China for the first time, and the three proposed metrics further characterise the sources of improvement after correction.
    Schlagwörter guidelines ; interferometry ; river deltas ; spatial data ; standard deviation ; synthetic aperture radar ; topography ; uncertainty ; China ; Yellow River
    Sprache Englisch
    Erscheinungsverlauf 2021-04
    Erscheinungsort Elsevier B.V.
    Dokumenttyp Artikel
    ISSN 1569-8432
    DOI 10.1016/j.jag.2020.102289
    Datenquelle NAL Katalog (AGRICOLA)

    Volltext online

    Zusatzmaterialien

    Kategorien

    Über subito bestellen

    Dieser Service ist kostenpflichtig (siehe Lieferbedingungen von subito). Bestellungen, die einen Artikel nebst Supplementary Material umfassen, werden grundsätzlich wie mehrfache Bestellungen bearbeitet. Gebühren fallen in diesen Fällen für jede einzelne Bestellung an.

    Fernleihe an ZB MED

    Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

  8. Artikel ; Online: Preliminary study on theory and method of ground-based GNSS-IR wind speed

    WANG Xiaolei / HE Xiufeng / CHEN Shu / ZHANG Qin / SONG Minfeng

    Acta Geodaetica et Cartographica Sinica, Vol 50, Iss 10, Pp 1298-

    2021  Band 1307

    Abstract: With the development of Global Navigation Satellite Systems (GNSS), the multipath effect that was once regarded as one error source has been proven can be used to monitor reflecting surface parameters such as water level, snow depth, vegetation water ... ...

    Abstract With the development of Global Navigation Satellite Systems (GNSS), the multipath effect that was once regarded as one error source has been proven can be used to monitor reflecting surface parameters such as water level, snow depth, vegetation water content, and soil moisture using a technology named GNSS-interferometry reflectomety (GNSS-IR). In order to expand monitoring objects and applications of GNSS-IR, this paper proposed the theory and method to retrieve wind speed using ground-based GNSS-IR. The theory includes the signal-to-noise ratio (SNR) multipath oscillation theory, the scattering model theory, and wave spectrum theory. This paper simulated the mathematical model between the SNR cutoff elevation angle and the wind speed, and used the wavelet analysis to extract SNR cutoff elevation angle and a unified method to unify reference of cutoff elevation angle. Data of HKQT station, located in Hong Kong, during the period of "Mangkhut" and "Hato" were used. The results showed that the variations of GPS L5 SNR cutoff elevation angles had a good corresponding relationship with the measured wind speeds, and the correlation coefficient reached 70%~85%. Also, the variations of cutoff elevation angles can describe the change of wind speed from low wind speed to high wind speed and there was a specific mathematical relationship between them. Finally, this paper discussed two difficulties to overcome in the GNSS-IR wind speed retrieval technology.
    Schlagwörter gnss-ir ; wind speed ; multipath ; signal-to-noise ratio ; masking angle ; wavelet analysis ; Mathematical geography. Cartography ; GA1-1776
    Thema/Rubrik (Code) 551
    Sprache Chinesisch
    Erscheinungsdatum 2021-10-01T00:00:00Z
    Verlag Surveying and Mapping Press
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

    Zusatzmaterialien

    Kategorien

    Fernleihe an ZB MED

    Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

  9. Artikel ; Online: Monitoring and analysis of subsidence along Lian-Yan railway using multi-temporal Sentinel-1A InSAR

    HE Xiufeng / GAO Zhuang / XIAO Ruya / LUO Haibin / FENG Can

    Acta Geodaetica et Cartographica Sinica, Vol 50, Iss 5, Pp 600-

    2021  Band 611

    Abstract: Multi-temporal interferometry synthetic aperture radar (MT-InSAR) has the capability to monitor deformation with millimeter precision over wide areas. It has been widely applied for the monitoring of land subsidence. In recent years, much attention was ... ...

    Abstract Multi-temporal interferometry synthetic aperture radar (MT-InSAR) has the capability to monitor deformation with millimeter precision over wide areas. It has been widely applied for the monitoring of land subsidence. In recent years, much attention was paid on monitoring of the subsidence along large-scale man-made linear features represented by high speed railway(HSR) with MT-InSAR. This paper conducts a tentative test for applying C-band SAR data to the deformation monitoring of HSR subgrade, phase stability analysis and improved StaMPS technology were jointly used to increase the point density and stability of deformation parameter solution. In this paper, a total of 47 Sentinel-1A images spanning 21 months were processed for MT-InSAR analysis along Lian-Yan HSR, and the accuracy of linear deformation velocity and time-series deformation were evaluated respectively by the data of continuous BDS (BeiDou navigation satellite system) monitoring station. The results demonstrate that C-band Sentinel-1A data is capable of achieving millimeter accuracy in linear deformation velocity and time-series deformation, the mean root mean square error (RMSE) value of time-series displacement differences between the InSAR and the BDS is 3.8 mm, agreed well with BDS monitoring data, and the overall performance of Lian-Yan HSR is stable.
    Schlagwörter multiple-temporal insar ; bds ; lian-yan railway ; subsidence monitoring ; sentinel-1a ; Mathematical geography. Cartography ; GA1-1776
    Sprache Chinesisch
    Erscheinungsdatum 2021-05-01T00:00:00Z
    Verlag Surveying and Mapping Press
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

    Zusatzmaterialien

    Kategorien

    Fernleihe an ZB MED

    Sie können sich den gewünschten Titel als lokale Nutzerin oder lokaler Nutzer von ZB MED direkt an den Standort Köln schicken lassen.

  10. Artikel ; Online: Numerical solution for circular tunnel excavated in strain-softening rock masses considering damaged zone.

    Li, Jinwang / Shen, Caihua / He, Xiufeng / Zheng, Xiangtian / Yuan, Jiaojiao

    Scientific reports

    2022  Band 12, Heft 1, Seite(n) 4465

    Abstract: Despite the extensive investigation on the stress and displacement distributions in tunnels, few have considered the influences of the damaged zone around a tunnel on the strength and stiffness parameters of the surrounding rock, including the gradual ... ...

    Abstract Despite the extensive investigation on the stress and displacement distributions in tunnels, few have considered the influences of the damaged zone around a tunnel on the strength and stiffness parameters of the surrounding rock, including the gradual variation in the damaged factor D and dimensionless damaged radius [Formula: see text], under the effect of excavation disturbance. In this paper, a numerical solution is presented for the stresses and displacement of a circular tunnel excavated in a Hoek-Brown rock mass considering the progressive destruction of the damaged zone. First, the results obtained using the proposed algorithm are compared with those obtained using other numerical solutions, demonstrating a high degree of accuracy through some examples. Second, the influences of the damaged factor [Formula: see text] and dimensionless damaged radius [Formula: see text] on the stresses, radial displacement, plastic radii, and ground response curve are investigated. The results show that, as the damaged factor D increases, the radial displacement and plastic radius increase, whereas the tangential stress decreases. Both the plastic radius and displacement decrease with decreasing [Formula: see text]. This shows that the damaged factor D has a significant effect on tunnel convergence.
    Sprache Englisch
    Erscheinungsdatum 2022-03-16
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-022-08531-3
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

    Über subito bestellen

    Dieser Service ist kostenpflichtig (siehe Lieferbedingungen von subito). Bestellungen, die einen Artikel nebst Supplementary Material umfassen, werden grundsätzlich wie mehrfache Bestellungen bearbeitet. Gebühren fallen in diesen Fällen für jede einzelne Bestellung an.

Zum Seitenanfang