PHYSICAL MODEL EXPERIMENTAL STUDY ON DEFORMATION AND FAILURE OF OVERLYING ROCK SLOPE UNDER THE CONDITION OF STEEP COAL SEAM MINING

HE Kai; GAO Yang; WANG Wenpei; ZHU Sainan

doi:10.12090/j.issn.1006-6616.2018.24.03.041

Volume 24 Issue 3

Jun. 2018

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Article Navigation > Journal of Geomechanics > 2018 > 24(3): 399-406

HE Kai, GAO Yang, WANG Wenpei, et al., 2018. PHYSICAL MODEL EXPERIMENTAL STUDY ON DEFORMATION AND FAILURE OF OVERLYING ROCK SLOPE UNDER THE CONDITION OF STEEP COAL SEAM MINING. Journal of Geomechanics, 24 (3): 399-406. DOI: 10.12090/j.issn.1006-6616.2018.24.03.041

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PHYSICAL MODEL EXPERIMENTAL STUDY ON DEFORMATION AND FAILURE OF OVERLYING ROCK SLOPE UNDER THE CONDITION OF STEEP COAL SEAM MINING

doi: 10.12090/j.issn.1006-6616.2018.24.03.041

HE Kai^{1, 2
,},
GAO Yang^{1, 2},
WANG Wenpei³,
ZHU Sainan³

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
Key Laboratory of Neotectonic and Goehazard, Ministry of Land Resources, Beijing 100081, China
3.
China Institute for Geo-Environment Monitoring, Beijing 100081, China

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Received: 2018-01-15
Revised: 2018-04-15
Published: 2018-06-01

Abstract

Abstract

Major rockslide is the main type of geological hazards in the mining mountainous areas of southwestern China. The failure modes and behaviors of this kind of rockslides are complex. Taking the Jiguanling landslide as an example, centrifuge modelling was taken to analyze the failure mechanism of a steep-dip carbonate slope which was induced by goaf in this study. With the model plate of coal seam was pulling out, the overlying strata began to move and dislocate under centrifugal acceleration. The model rock slope failed completely when the model plate was pulled out about 150mm.The experimental results show that the deformation tendency of bending and toppling appeared in steep-dip and layered limestone slopes by gravity. With the underground mining of coal seams, overlying steep-dip and layered rock slope lost its support, then strata got separated and tension fissures were generated. These rock strata were toppled due to severe deformation. The underlying stable rock mass was squeezed by the toppled overlying strata, and shear failure occurred. In the end, the Jiguangling rock slope was failed with the composite mode of toppling-sliding. This study could be a guide of early identification and failure mechanism analysis for major rockslides in mountainous area of southwestern China.
- steep-dip and layered slope,
- underground goaf,
- failure,
- centrifuge model,
- toppling-sliding

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References(27)

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PHYSICAL MODEL EXPERIMENTAL STUDY ON DEFORMATION AND FAILURE OF OVERLYING ROCK SLOPE UNDER THE CONDITION OF STEEP COAL SEAM MINING

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PHYSICAL MODEL EXPERIMENTAL STUDY ON DEFORMATION AND FAILURE OF OVERLYING ROCK SLOPE UNDER THE CONDITION OF STEEP COAL SEAM MINING

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