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Volume 39 Issue 4
Aug.  2020
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Article Navigation >  CARSOLOGICA SINICA  > 2020  >  39(4): 453-466
LI Jun, CHU Hongliang, LI Bin, HE Kai, GAO Yang. Key scientific issues in research on landslide hazard induced by underground mining in mountainous areas with coal-bearing strata of southwestern China[J]. CARSOLOGICA SINICA, 2020, 39(4): 453-466. doi: 10.11932/karst20200401
Citation: LI Jun, CHU Hongliang, LI Bin, HE Kai, GAO Yang. Key scientific issues in research on landslide hazard induced by underground mining in mountainous areas with coal-bearing strata of southwestern China[J]. CARSOLOGICA SINICA, 2020, 39(4): 453-466. doi: 10.11932/karst20200401
shu

Key scientific issues in research on landslide hazard induced by underground mining in mountainous areas with coal-bearing strata of southwestern China

doi: 10.11932/karst20200401
  • 1.

    Key Laboratory of Neotectonic Movement Geohazard, Institute of Geomechanics, CAGS/China University of Geosciences ( Beijing)

  • 2.

    China Institute of Geological Environment Monitoring

  • 3.

    Key Laboratory of Neotectonic Movement Geohazard, Institute of Geomechanics, CAGS

  • Publish Date: 2020-08-25
    Abstract
  • Underground mining activities often trigger large-scale landslide on mountain slopes, causing casualties and property losses. Based on the analysis of the development characteristics of landslide hazard induced by underground mining, this paper considers that such landslide hazard often occur in the cliff belts of fold wings and core composed of layered carbonate rock and clastic rock strata in mountainous area with coal-bearing strata of southwestern China, which is closely related to factors such as topography, stratum structure and underground mining engineering activities. It is pointed out the following processes that large-scale landslide hazard induced by thin seam mining，(1) The overlying rock roof collapses and the overburden rock roof separates, and the stress transfer from the bottom to the top in and between the overburden rock in the goaf after the mined-out; (2)The formation of underground water migration channels accelerates the failure and expansion of rock mass structures on a larger scale, accelerating the loosening and failure of rock mass structural planes;(3) The uneven settlement of the overburden rock strata leads to fractures at the foot of the slope, and the large-scale rock mass structural surface of the mountain body gradually deforms under tension shear or compression shear, eventually resulting cumulative damage and large-scale landslide hazard. At the same time, this study suggests that the calculation method of traditional empirical formula is no longer applicable to this type of landslide hazard induced by underground mining.It is recommended to develop the research on following key scientific issues, including the interaction relationship between the geological structure and the landslide hazard induced by underground mining of the karst mountainous area with coal-bearing strata of southwestern China, the cumulative fracture damage and rock mass loosening in the upper part of thin seam goaf, fracture expansion and karst conduit flow, the chain response mechanism of fracture flow change of upper mountain in the mined area of thin ore bed, and the evaluation method of landslide hazard induced by underground mining，etc. The purpose is to promote the the development of prevention and mitigation work of geological hazard induced by underground mining.

     

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