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  1. Article ; Online: Identification for Abutment Stress by Drilling Cuttings

    Jian Tan / Yunliang Tan / Zihui Wang / Yubao Zhang

    Applied Sciences, Vol 11, Iss 9467, p

    2021  Volume 9467

    Abstract: The concentration of abutment pressure acting on coal seams induced by mining is a key factor to trigger rock burst. Understanding of abutment pressure or stress concentration is fundamental in preventing and controlling rock burst. The influence on ... ...

    Abstract The concentration of abutment pressure acting on coal seams induced by mining is a key factor to trigger rock burst. Understanding of abutment pressure or stress concentration is fundamental in preventing and controlling rock burst. The influence on abutment pressure fluctuation caused by the inhomogeneity of coal seams needs to be considered, but it is difficult to obtain by the present usual ways such as acoustic transmission, electromagnetic wave transmission, etc. In this article, the relationship between the amount of cuttings drilled in a coal seam and stress level was analyzed by considering the effect of drilling cutting expansion, and the drilling cutting test was carried out in Xinglongzhuang Coal Mine, Shandong Energy Ltd. It is found that the amount of cuttings drilled is positively related to the degree of stress concentration in both the plastic fracture zone and elastic zone. The amount of drilling cuttings is closely related to the roof weighting. In addition, the irregular fluctuation of drilling cuttings is an approximate map of distribution of stress concentration because of the non-uniformity of cracks and other defects in the coal seam. In order to meet the need of rock burst prevention by accurate pressure relief in high-stress zones, enough boreholes are needed.
    Keywords abutment stress ; drilling cutting ; roof weighting ; pressure relief ; Technology ; T ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Biology (General) ; QH301-705.5 ; Physics ; QC1-999 ; Chemistry ; QD1-999
    Subject code 670
    Language English
    Publishing date 2021-10-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Experimental study on mechanical properties of saucer tray used in mine

    Jinglong Jia / Fenghai Yu / Yunliang Tan / Yubao Zhang / Xingyin Ma

    E3S Web of Conferences, Vol 303, p

    2021  Volume 01014

    Abstract: This paper takes the saucer tray as the research object, carries on the unidirectional compression test to it in the room, through the monitoring of the deformation characteristics of the saucer tray, analyzes the deformation characteristics of the ... ...

    Abstract This paper takes the saucer tray as the research object, carries on the unidirectional compression test to it in the room, through the monitoring of the deformation characteristics of the saucer tray, analyzes the deformation characteristics of the saucer tray. According to its deformation characteristics, the saucer tray is divided into deformation areas. A static strain gauge was used to monitor the strain at the measuring point on the surface of the tray and the stress distribution on the exposed surface of the tray was studied. It is intended to infer the force of the disk-shaped tray through its deformation degree, which provides a certain theoretical basis and practical guiding significance for the research of disk-shaped tray.
    Keywords Environmental sciences ; GE1-350
    Language English
    Publishing date 2021-01-01T00:00:00Z
    Publisher EDP Sciences
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Key Factors Identification and Risk Assessment for the Stability of Deep Surrounding Rock in Coal Roadway

    Dongmei Huang / Weijun Li / Xikun Chang / Yunliang Tan

    International Journal of Environmental Research and Public Health, Vol 16, Iss 15, p

    2019  Volume 2802

    Abstract: In order to evaluate the stability of deep surrounding rock, all of the affecting factors should be theoretically identified. However, some factors have slight impacts on the stability of deep surrounding rock compared with others. To conduct an ... ...

    Abstract In order to evaluate the stability of deep surrounding rock, all of the affecting factors should be theoretically identified. However, some factors have slight impacts on the stability of deep surrounding rock compared with others. To conduct an effective risk assessment, key factors should be first extracted. The analytic hierarchy process (AHP) and grey relation analysis (GRA) methods are integrated to determine the key factors. First, the AHP method is applied to sort the factors by calculating the weights of them. Seven out of fifteen factors are extracted as the key factors, which account for 80% of the weights. Further, the GCA method is used to validate the effects of these key factors by analyzing the correlation between the performance of each factor and that of the reference. Considering the influence of these key factors and experts’ judgements, the multilevel fuzzy comprehensive evaluation method is adopted to obtain the risk level of the deep surrounding rock stability. Finally, the risk assessment of the deep surrounding rock in the E-Zhuang coal mine of Chinese Xinwen Mining Area illustrates the operability of the proposed method.
    Keywords key factors ; risk assessment ; deep surrounding rock stability ; AHP-GRA ; Medicine ; R
    Language English
    Publishing date 2019-08-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Numerical investigation of failure evolution for the surrounding rock of a super‐large section chamber group in a deep coal mine

    Yunliang Tan / Deyuan Fan / Xuesheng Liu / Shilin Song / Xianfeng Li / Honglei Wang

    Energy Science & Engineering, Vol 7, Iss 6, Pp 3124-

    2019  Volume 3146

    Abstract: Abstract The stability control of surrounding rock for a large or super‐large section chamber group is a difficult technical problem in deep mining conditions, and this stability control has become one of the most important factors restricting the safety ...

    Abstract Abstract The stability control of surrounding rock for a large or super‐large section chamber group is a difficult technical problem in deep mining conditions, and this stability control has become one of the most important factors restricting the safety of a large‐scale coal mine. Based on the in‐site geological conditions of a super‐large section chamber group that functions for a coal gangues separation system in the Longgu Coal Mine, we first researched the stress, deformation, and failure characteristics of the in‐site chamber group surrounding rocks by using the FLAC3D software. Simulation results showed that the maximum vertical stress, deformation, and failure range of the surrounding rock for a super‐large section chamber group are larger than those of an ordinary section chamber. In addition, the roof subsidence and the plastic zone radius at the intersection are obviously larger than that of other parts, which increase by approximately 50.8% and 44.4%, respectively. Therefore, the chamber group intersection should be taken as the key area for surrounding rock control. Then, the influences of two key parameters of the chamber group, spacing and angle, were researched in detail to help in the design of the chamber group. Results show that when the chamber spacing is 80 m, the interaction begins to occur. When the angle is 70°, the stress of the surrounding rock and roof subsidence reach the minimum. Thus, the optimum chamber group parameters are determined to be a spacing of 80 m and an angle of 70°. Finally, from the perspective of chamber group stability, the optimal chamber group parameters can better meet the normal use for the super‐large section chamber group. This research provides a reference for the design of a super‐large section chamber group under the same or similar conditions and provides a strategy for controlling the surrounding rock.
    Keywords chamber angle ; chamber group ; chamber spacing ; deep coal mine ; failure evolution ; super‐large section ; Technology ; T ; Science ; Q
    Subject code 621
    Language English
    Publishing date 2019-12-01T00:00:00Z
    Publisher Wiley
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: An innovative approach for gob‐side entry retaining in deep coal mines

    Deyuan Fan / Xuesheng Liu / Yunliang Tan / Lei Yan / Shilin Song / Jianguo Ning

    Energy Science & Engineering, Vol 7, Iss 6, Pp 2321-

    A case study

    2019  Volume 2335

    Abstract: Abstract Due to the complex geostress and mining conditions in the coal seam with depth of 800 m, stability of surrounding rock for gob‐side entry retaining is very difficult to achieve. In this paper, we firstly propose an innovative bolt‐grouting ... ...

    Abstract Abstract Due to the complex geostress and mining conditions in the coal seam with depth of 800 m, stability of surrounding rock for gob‐side entry retaining is very difficult to achieve. In this paper, we firstly propose an innovative bolt‐grouting controlled roof‐cutting for gob‐side entry retaining (BCR‐GER) approach for deep coal mines. Secondly, a mechanical model of “surrounding rock‐supporting body” for BCR‐GER is constructed, which consists of coal wall, roadside props, and gangues in gob (the whole supporting body). Thirdly, the key parameters (ie, cutting height, cutting angle, grouting cable length, and row of roadside props) are designed. Finally, field practice was applied at the No. 31120 haulage roadway of the Suncun coal mine in China, and in situ investigations were conducted for verification. Field measurement results show that maximum convergences of roof‐to‐floor and side‐to‐side were 264 mm and 113 mm, respectively. What is more, the maximum support resistance of roadside props was reduced by approximately 58%. The deformation and failure of surrounding rock were effectively controlled, and the pressure on roadside props was greatly reduced. This research fully considers the bearing properties of gangues in gob, eliminates the secondary disasters caused by borehole blasting, and provides guidance and reference for deep surrounding rock control of the same or similar gob‐side entry.
    Keywords BCR‐GER approach ; deep‐mining condition ; mechanical model ; parameters optimization ; Technology ; T ; Science ; Q
    Subject code 670
    Language English
    Publishing date 2019-12-01T00:00:00Z
    Publisher Wiley
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Anisotropic modeling of layered rocks incorporating planes of weakness and volumetric stress

    Shanchao Hu / Yunliang Tan / Hui Zhou / Wenkai Ru / Jianguo Ning / Jun Wang / Dongmei Huang / Zhen Li

    Energy Science & Engineering, Vol 8, Iss 3, Pp 789-

    2020  Volume 803

    Abstract: Abstract Layered rocks exhibit notable transverse isotropy and have a significant impact on the deformation and failure characteristics of underground structures. To a large extent, the mechanical properties of layered rocks are related to the structure ... ...

    Abstract Abstract Layered rocks exhibit notable transverse isotropy and have a significant impact on the deformation and failure characteristics of underground structures. To a large extent, the mechanical properties of layered rocks are related to the structure and stress state of their bedding planes. To obtain an in‐depth understanding of the deformation and yield characteristics of layered rocks, a mechanical model for layered rocks incorporating planes of weakness and volumetric stress is proposed by improving the strain‐hardening/softening ubiquitous‐joint model based on continuum mechanics methods. In this mechanical model, elastoplastic equations for the matrix and bedding planes of layered rocks are established. The evolution of the mechanical parameters of the matrix and bedding planes of layered rocks with the internal variable is determined. In addition, the sensitivity of the model parameters is analyzed, and a method for determining the parameters is provided to reduce the complexity in obtaining these parameters. The numerical calculation results for the laboratory tests on layered sandstone specimens under various stress levels agree relatively well with the test results, thereby validating the effectiveness of the improved model. The methods and results of this study provide a significant reference for the analysis of the deformation and failure of other layered rocks.
    Keywords anisotropy ; mechanical model ; plastic internal variable ; sensitivity analysis ; volumetric stress ; Technology ; T ; Science ; Q
    Subject code 670
    Language English
    Publishing date 2020-03-01T00:00:00Z
    Publisher Wiley
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Investigation of Rock Failure Pattern in Creep by Digital Speckle Correlation Method

    Yunliang Tan / Yanchun Yin / Tongbin Zhao

    Advances in Materials Science and Engineering, Vol

    2013  Volume 2013

    Keywords Physics ; QC1-999 ; Science ; Q ; DOAJ:Physics (General) ; DOAJ:Physics and Astronomy ; Materials of engineering and construction. Mechanics of materials ; TA401-492 ; Electrical engineering. Electronics. Nuclear engineering ; TK1-9971 ; Technology ; T ; DOAJ:Materials ; DOAJ:Technology and Engineering
    Language English
    Publishing date 2013-01-01T00:00:00Z
    Publisher Hindawi Publishing Corporation
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Rock Mechanical Property Influenced by Inhomogeneity

    Yunliang Tan / Dongmei Huang / Ze Zhang

    Advances in Materials Science and Engineering, Vol

    2012  Volume 2012

    Keywords Physics ; QC1-999 ; Science ; Q ; DOAJ:Physics (General) ; DOAJ:Physics and Astronomy ; Materials of engineering and construction. Mechanics of materials ; TA401-492 ; Electrical engineering. Electronics. Nuclear engineering ; TK1-9971 ; Technology ; T ; DOAJ:Materials ; DOAJ:Technology and Engineering
    Language English
    Publishing date 2012-01-01T00:00:00Z
    Publisher Hindawi Publishing Corporation
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Rockburst Disaster Prediction of Isolated Coal Pillar by Electromagnetic Radiation Based on Frictional Effect

    Tongbin Zhao / Yanchun Yin / Fukun Xiao / Yunliang Tan / Jianchao Zou

    The Scientific World Journal, Vol

    2014  Volume 2014

    Abstract: Based on the understanding that charges generated during coal cracking are due to coal particle friction, a microstructure model was developed by considering four different variation laws of friction coefficient. Firstly, the frictional energy release of ...

    Abstract Based on the understanding that charges generated during coal cracking are due to coal particle friction, a microstructure model was developed by considering four different variation laws of friction coefficient. Firstly, the frictional energy release of coal sample during uniaxial compressive tests was investigated and discussed. Then electromagnetic radiation method was used to predict the potential rockburst disaster in isolated coal pillar mining face, Muchengjian Colliery. The results indicate that the friction coefficient of coal particles decreases linearly with the increase of axial loading force. In predicting the strain-type rockburst, the high stress state of coal must be closely monitored. Field monitoring shows that electromagnetic radiation signal became abnormal before the occurrence of rockburst during isolated coal pillar mining. Furthermore, rockburst tends to occur at the early and ending stages of isolated coal pillar extraction. Mine-site investigation shows the occurrence zone of rockburst is consistent with the prediction, proving the reliability of the electromagnetic radiation method to predict strain-type rockburst disaster.
    Keywords Science (General) ; Q1-390
    Language English
    Publishing date 2014-01-01T00:00:00Z
    Publisher Hindawi Publishing Corporation
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article ; Online: Rockburst Disaster Prediction of Isolated Coal Pillar by Electromagnetic Radiation Based on Frictional Effect

    Tongbin Zhao / Yanchun Yin / Fukun Xiao / Yunliang Tan / Jianchao Zou

    The Scientific World Journal, Vol

    2014  Volume 2014

    Keywords Science ; Q ; Science (General) ; Q1-390
    Publishing date 2014-01-01T00:00:00Z
    Publisher Hindawi Publishing Corporation
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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