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  1. Article ; Online: Research on representation of particle size distribution for standard sands

    Wang, Jing / Ling, Jinghua / Ling, Daosheng / Hu, Tiantian / He, Chunjian

    Powder Technology. 2023 June, v. 424 p.118537-

    2023  

    Abstract: The determination of favorite engineering indexes which are sufficient and necessary to reflect particle size distribution (PSD) is a key issue to bridge micro to macro behaviors of granular materials. Focusing on the continuous gradings, standard sand ... ...

    Abstract The determination of favorite engineering indexes which are sufficient and necessary to reflect particle size distribution (PSD) is a key issue to bridge micro to macro behaviors of granular materials. Focusing on the continuous gradings, standard sand is selected as a representative, and the data of six typical sands is firstly collected to establish a database of PSD. Secondly, the cumulative central beta distribution is adopted to describe grading curves of particles due to its greater flexibility and fewer parameters, and the physical validation of its parameters is analyzed further. Six combinations of five engineering indexes are respectively applied to calculate the parameters of cumulative central beta distribution. The deviation between the analysis results and the observed data is evaluated. The study reveals that mean particle size D₅₀ and coefficient of uniformity Cᵤ are the most proper combination to describe PSD and can be used to link the PSDs to micro-macro mechanical responses.
    Keywords databases ; particle size ; particle size distribution ; sand ; Granular materials ; Cumulative central beta distribution ; Standard sands ; Engineering indexes ; Deviation evaluation
    Language English
    Dates of publication 2023-06
    Publishing place Elsevier B.V.
    Document type Article ; Online
    Note Pre-press version
    ISSN 0032-5910
    DOI 10.1016/j.powtec.2023.118537
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  2. Article ; Online: Large-deformation consolidation models of saturated–unsaturated materials under self-weight and evaporation

    Chen, Xuanquan / Qi, Shunchao / Paul, Simms / Wang, Yuntao / Ling, Daosheng / Yang, Xingguo

    Journal of Hydrology. 2023 Feb., v. 617 p.129130-

    2023  

    Abstract: This paper develops the one-dimensional large-deformation consolidation theory for the porous medium under alternating saturated–unsaturated conditions, through a former generalization of the well-established Gibson’s nonlinear theory from saturated to ... ...

    Abstract This paper develops the one-dimensional large-deformation consolidation theory for the porous medium under alternating saturated–unsaturated conditions, through a former generalization of the well-established Gibson’s nonlinear theory from saturated to unsaturated regime. With the differential relations between the coordinate systems, the equations governing the momentum\mass balances in the unsaturated porous stratum are transported from the moving current to the initial Lagrangian coordinate system. Without loss of generality, the collective forms of various incremental constitutive laws are then incorporated for unsaturated materials, indicating that any particular constitutive law has been embraced. Two forms of final governing equations are derived depending on the primary independents: σv-uw (total vertical stress - pore fluid pressure) and w (gravimetric water content); which are solved by two distinct finite-element codes on the initial fixed configuration. Numerical examples demonstrate that the two resulting Total Lagrangian formulations are equivalent, yield virtually identical predictions and agrees well with an existing finite-differential code that solves the equations in the convective configuration. The dynamical consolidation process evolving from a weight-driven saturated stage to an evaporation-driven unsaturated stage is quantitatively captured very well by the predictions. The impacts of evaporation, material’s compressibility, and permeability in these two distinct stages are independently explored through several parametric analyses on the consolidation/dewatering rates and the penetration of drying front. Through one factor must affect, in concert with the others, such a hydro-mechanical coupling process, these results can provide a profound understanding of the entire consolidation process of a porous stratum under large deformations.
    Keywords compressibility ; dewatering ; evaporation ; gravimetric water content ; hydrology ; permeability ; porous media ; Large-deformation ; Consolidation theory ; Unsaturated porous medium ; One-dimensional ; Weight-driven consolidation ; Evaporation-driven consolidation
    Language English
    Dates of publication 2023-02
    Publishing place Elsevier B.V.
    Document type Article ; Online
    ZDB-ID 1473173-3
    ISSN 1879-2707 ; 0022-1694
    ISSN (online) 1879-2707
    ISSN 0022-1694
    DOI 10.1016/j.jhydrol.2023.129130
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  3. Article: Flow regimes detection in a quasi-2D granular chute flow based on PTV technique

    Zhao, Yu / Wang, Wei / Luo, Yuxuan / Liu, Zhun / Liang, Teng / Ling, Daosheng

    Powder technology. 2022 Apr. 13,

    2022  

    Abstract: An improved PTV technique for understanding the mechanical behaviors of each flow regime in granular chute flows at particle scale has been proposed. The PTV technique mainly includes two parts, particle recognition and particle matching. For particle ... ...

    Abstract An improved PTV technique for understanding the mechanical behaviors of each flow regime in granular chute flows at particle scale has been proposed. The PTV technique mainly includes two parts, particle recognition and particle matching. For particle recognition, the light intensity detection plate (LIDP) was introduced to detect the minimum light intensity of particles which was used to separate the sidewall and internal particles of granular flows; these particle centroids were initially estimated by the light spot method (LSM) in granular flows and then corrected by combining the image processing method (IPM) and the inverse distance weighting method (IDWM). For particle matching, the quasi-rigidity threshold (Tq) in particle matching step of PTV algorithm were determined by layer by layer incremental-iteration method. An example analysis of three physical model experiments was used to demonstrate the capabilities of the improved PTV. The estimated particle centroids are very close to the geometric centroids of the particles; the total recovery ratio are up to 97.3% for 28°, 96.4% for 32° and 94.3% for 36° flows. Moreover, the averaged multiple collision ratio, the granular temperature and the linear strain of flow layers were used to determine which flow regime each flow layer belongs to. Finally, these detection results of flow regime were verified by the critical state soil mechanics (for solid-like flow regime) and kinetic theory (for gas-like flow regime).
    Keywords algorithms ; light intensity ; soil mechanics ; technology ; temperature
    Language English
    Dates of publication 2022-0413
    Publishing place Elsevier B.V.
    Document type Article
    Note Pre-press version
    ISSN 0032-5910
    DOI 10.1016/j.powtec.2022.117411
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  4. Article: Evaluating slope stability with 3D limit equilibrium technique and its application to landfill in China

    Qi, Shunchao / Ling, Daosheng / Yao, Qiang / Lu, Gongda / Yang, Xingguo / Zhou, Jia-wen

    Engineering geology. 2021 Jan., v. 280

    2021  

    Abstract: A new derivation of the three-dimensional (3D) limit equilibrium method for slope stability analyses is presented, which applies linear algebra operations to matrices to achieve a highly efficient algorithm while maintaining the rigorousness of the ... ...

    Abstract A new derivation of the three-dimensional (3D) limit equilibrium method for slope stability analyses is presented, which applies linear algebra operations to matrices to achieve a highly efficient algorithm while maintaining the rigorousness of the formulation. It satisfies six equilibrium conditions and includes all of the components of the intercolumnar forces. The generalized 3D Morgenstern-Price's (MP) assumption for the intercolumn forces is recast into incremental forms. The advantage is that the unknowns of the different physical meanings (i.e., factor of safety (FS) and the coefficients in the MP assumption) are determined by balancing the forces and moments independently. Along with the recasting correction coefficients, they are solved with the triple nested algorithm. The numerical instability that is related to the different orders of magnitude for the residuals is avoided. The varication examples show: (i) the insensitivity of the FS to the prescribed functions in the MP assumption, (ii) the reliability of the method to cope with a complicated slope geometry (simplified methods may provide a larger FS for certain cases), and (iii) the superior efficiency of the algorithm (requires several seconds to converge). This study proposes a practical way to track the irregular 3D tension cracking by repeating the analysis and excluding the columns with the negative normal forces at the bottom. This formulation is applied to a valley landfill slope in China. In comparison to the two-dimensional analysis, there are more reasonable/cost-effective measures to increase the system stability through 3D analyses for several conditions (e.g., seismic loading).
    Keywords algebra ; algorithms ; geometry ; geophysics ; landfills ; China
    Language English
    Dates of publication 2021-01
    Publishing place Elsevier B.V.
    Document type Article
    Note NAL-AP-2-clean
    ISSN 0013-7952
    DOI 10.1016/j.enggeo.2020.105939
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  5. Article ; Online: Datasets for liquefaction case studies of gravelly soils during the 2008 Wenchuan earthquake.

    Zhou, Yan-Guo / Xia, Peng / Ling, Dao-Sheng / Chen, Yun-Min

    Data in brief

    2020  Volume 32, Page(s) 106308

    Abstract: This Data in Brief article provides summarized information of the liquefaction case histories from the 12 May ... ...

    Abstract This Data in Brief article provides summarized information of the liquefaction case histories from the 12 May 2008
    Language English
    Publishing date 2020-09-14
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2786545-9
    ISSN 2352-3409 ; 2352-3409
    ISSN (online) 2352-3409
    ISSN 2352-3409
    DOI 10.1016/j.dib.2020.106308
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Datasets for liquefaction case studies of gravelly soils during the 2008 Wenchuan earthquake

    Zhou, Yan-Guo / Xia, Peng / Ling, Dao-Sheng / Chen, Yun-Min

    Data in Brief. 2020 Oct., v. 32

    2020  

    Abstract: This Data in Brief article provides summarized information of the liquefaction case histories from the 12 May 2008 Mw7.9 Wenchuan earthquake. According to the data processing procedures recommended in the related research article, all eighty-one case ... ...

    Abstract This Data in Brief article provides summarized information of the liquefaction case histories from the 12 May 2008 Mw7.9 Wenchuan earthquake. According to the data processing procedures recommended in the related research article, all eighty-one case histories investigated by the present authors and seven other case histories from the literature are carefully compiled. All necessary information and the mean and standard deviation for some key parameters are given for these liquefaction case histories (i.e., site name, site location, site inclination angle, liquefaction manifestations, critical layer, soil sampling information, ground motion, total and effective stresses, shear-mass participation parameter, cyclic stress ratio (CSR) for Mw=7.5, normalized shear wave velocity (Vₛ₁), data class and field testing time). These data may be used by colleagues to study the effect of gravel content on liquefaction behaviour of gravelly soils and develop the corresponding deterministic or probabilistic methods for liquefaction triggering evaluation.
    Keywords data collection ; earthquakes ; gravel ; liquefaction ; standard deviation
    Language English
    Dates of publication 2020-10
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 2786545-9
    ISSN 2352-3409
    ISSN 2352-3409
    DOI 10.1016/j.dib.2020.106308
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  7. Article: Study on reverse fault rupture propagation through sand with inclined ground surface

    Shi, Ji-Sen / Ling, Dao-Sheng / Hu, Cheng-Bao / Tu, Fu-bin

    Engineering geology. 2020 Oct., v. 276

    2020  

    Abstract: Previous studies on faulting were performed on horizontal grounds, which were hypothesized implicitly. As an increasing number of infrastructures are being built on topographically complex sites such as mountainous areas, investigations into fault ... ...

    Abstract Previous studies on faulting were performed on horizontal grounds, which were hypothesized implicitly. As an increasing number of infrastructures are being built on topographically complex sites such as mountainous areas, investigations into fault rupture propagation through soil with an inclined surface have become significant. In this study, a series of 1 g physical model tests of reverse faulting with inclined ground surfaces were performed. The effects of ground inclination on the geometry of fault ruptures, displacement at the ground surface, and deformation of the sand layer were investigated. Three classical soil mechanics theories, namely, the Rankine, Roscoe, and Vermeer theories, were used to predict the directions of fault ruptures in sand with inclined ground surfaces. The predicted values were compared with the measured values obtained from the model tests. Based on the experimental results, a configuration of the setback limits for structures on an inclined ground is recommended to prevent destruction by fault ruptures.
    Keywords deformation ; geometry ; mountains ; sand ; soil ; soil mechanics
    Language English
    Dates of publication 2020-10
    Publishing place Elsevier B.V.
    Document type Article
    Note NAL-AP-2-clean
    ISSN 0013-7952
    DOI 10.1016/j.enggeo.2020.105768
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  8. Article: Liquefaction case studies of gravelly soils during the 2008 Wenchuan earthquake

    Zhou, Yan-Guo / Xia, Peng / Ling, Dao-Sheng / Chen, Yun-Min

    Engineering geology. 2020 Sept. 05, v. 274

    2020  

    Abstract: The 2008 Wenchuan earthquake caused widespread liquefaction of gravelly soils (i.e., gravelly sands and sandy gravels), which phenomena show many differences compared to those of typical sands. To study the liquefaction mechanism and triggering ... ...

    Abstract The 2008 Wenchuan earthquake caused widespread liquefaction of gravelly soils (i.e., gravelly sands and sandy gravels), which phenomena show many differences compared to those of typical sands. To study the liquefaction mechanism and triggering evaluation of gravelly soils during this event, comprehensive case studies with measurement of shear wave velocity on both liquefied and non-liquefied sites were carried out according to a suite of recommended procedures for site investigation, field testing and data processing. Three typical cases were provided to illustrate the distinct characteristics of ground motion, liquefaction manifestation, soil profiles and field testing, and explore the possible mechanisms of liquefaction. Eighty-one well identified case histories were obtained, which feature the updated estimation of ground motion parameters from the USGS ShakeMap and the probabilistic treatment of the datasets. The preliminary analyses on liquefaction triggering boundary curves, shear wave velocities of these case histories and the applicability of the Ishihara criterion (1985) indicate that the gravel content plays a key role in the liquefaction mechanism and the consequences of gravelly soil deposits, and the liquefaction evaluation of gravelly sands and sandy gravels should be treated separately.
    Keywords data collection ; earthquakes ; gravel ; gravelly soils ; liquefaction
    Language English
    Dates of publication 2020-0905
    Publishing place Elsevier B.V.
    Document type Article
    Note NAL-AP-2-clean
    ISSN 0013-7952
    DOI 10.1016/j.enggeo.2020.105691
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  9. Article: Centrifuge modeling of dynamic response of high fill slope by using generalized scaling law

    Zhou, Yan-Guo / Chen, Yun-Min / Huang, Bo / Ling, Dao-Sheng / Ma, Qiang / Meng, Di

    Engineering geology. 2019 Oct. 03, v. 260

    2019  

    Abstract: The development of physical modeling for mega engineering prototypes requires sophisticated use of the capability of current centrifuge facilities. In this study, centrifuge model tests were performed to investigate the dynamic response of high fill ... ...

    Abstract The development of physical modeling for mega engineering prototypes requires sophisticated use of the capability of current centrifuge facilities. In this study, centrifuge model tests were performed to investigate the dynamic response of high fill slope by using generalized scaling law in an improved way. Firstly the two-stage generalized scaling law was partly re-organized by considering the separate similitude of dynamic strain for the virtual 1 g field, to solve the inherent problem of the scaling of soil strain when the derived prototype strain exceeded some important thresholds. Then a series of centrifuge model tests were conducted under different centrifugal accelerations to model a high fill slope with a prototype height of 100 m by the approach of “modeling of models”. Dynamic responses under sine waves with different amplitudes were monitored and the re-organized generalized scaling law was validated for nonlinear dynamic response with shear strain less than 1%. It was observed that site amplification of high fill slope was affected by both soil nonlinearity and soil strata non-uniformity, where soil nonlinearity led to smaller acceleration amplification under stronger excitation and soil strata non-uniformity contributed to the acceleration de-amplification and larger displacement amplification at the weak sublayer. The large dynamic displacement near the slope surface consequently contributes to the development of lateral cracks after strong shaking. Seismic response under earthquake motions revealed that high fill slope with inclined non-uniform strata was characterized by multiple vibration modes and lower fundamental frequency, which was more vulnerable to earthquake motions with abundant frequency components. This study provides a more physically meaningful use of the similitude of dynamic stress-strain relation in centrifuge modeling for large-scale geotechnical problems under dynamic loadings.
    Keywords earthquakes ; engineering ; geophysics ; models ; prototypes ; soil ; vibration
    Language English
    Dates of publication 2019-1003
    Publishing place Elsevier B.V.
    Document type Article
    ISSN 0013-7952
    DOI 10.1016/j.enggeo.2019.105213
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  10. Article ; Online: Uplifting behavior of shallow buried pipe in liquefiable soil by dynamic centrifuge test.

    Huang, Bo / Liu, Jingwen / Lin, Peng / Ling, Daosheng

    TheScientificWorldJournal

    2014  Volume 2014, Page(s) 838546

    Abstract: Underground pipelines are widely applied in the so-called lifeline engineerings. It shows according to seismic surveys that the damage from soil liquefaction to underground pipelines was the most serious, whose failures were mainly in the form of ... ...

    Abstract Underground pipelines are widely applied in the so-called lifeline engineerings. It shows according to seismic surveys that the damage from soil liquefaction to underground pipelines was the most serious, whose failures were mainly in the form of pipeline uplifting. In the present study, dynamic centrifuge model tests were conducted to study the uplifting behaviors of shallow-buried pipeline subjected to seismic vibration in liquefied sites. The uplifting mechanism was discussed through the responses of the pore water pressure and earth pressure around the pipeline. Additionally, the analysis of force, which the pipeline was subjected to before and during vibration, was introduced and proved to be reasonable by the comparison of the measured and the calculated results. The uplifting behavior of pipe is the combination effects of multiple forces, and is highly dependent on the excess pore pressure.
    MeSH term(s) Centrifugation ; Engineering/methods ; Extraction and Processing Industry/instrumentation ; Groundwater ; Models, Theoretical ; Pressure ; Soil ; Vibration
    Chemical Substances Soil
    Language English
    Publishing date 2014-07-10
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2075968-X
    ISSN 1537-744X ; 1537-744X
    ISSN (online) 1537-744X
    ISSN 1537-744X
    DOI 10.1155/2014/838546
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