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Volume 40 Issue 6
Dec.  2021
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Article Navigation >  CARSOLOGICA SINICA  > 2021  >  40(6): 932-942
WU Yuanbin,LUO Weiquan,YIN Renchao,et al.Distribution law and genetic mechanism of karst collapse in Longquan village-Qingfengshan village, Chongqing[J].Carsologica Sinica,2021,40(06):932-942. doi: 10.11932/karst2021y43
Citation: WU Yuanbin,LUO Weiquan,YIN Renchao,et al.Distribution law and genetic mechanism of karst collapse in Longquan village-Qingfengshan village, Chongqing[J].Carsologica Sinica,2021,40(06):932-942. doi: 10.11932/karst2021y43
shu

Distribution law and genetic mechanism of karst collapse in Longquan village-Qingfengshan village, Chongqing

doi: 10.11932/karst2021y43
  • 1.

    College of Civil Engineering and Architecture， Guilin University of Technology， Guilin， Guangxi 541004，China

  • 2.

    Institute of Karst Geology， CAGS/ Key Laboratory of Karst Dynamic， MNR&GZAR/ Key Laboratory of Karst Collapse Prevention， CGS， Guilin， Guangxi 541004，China

  • 3.

    Guangxi Key Laboratory for Geomechanics and Engineering，Guilin， Guangxi 541004，China

Funds:

 DD20190266

 41867039, 41877300, 42077273

 2021003, 2021010

 CXZX2020002

  • Received Date: 2021-04-11
  • Publish Date: 2021-12-25
    Abstract
  • Located in Longquan village and Qingfengshan village， Zhongliang mountain， Chongqing， the study area is a geologically hazard area of karst collapse induced by the construction of Tuzhu tunnel. A total of 45 collapse pits developed in the area， which seriously endanger the safety of roads， houses， pipelines and villagers' lives. In order to find out the distribution law and genetic mechanism of karst collapse in the study area， this paper systematically studies the karst collapse by carrying out a number of work， such as special ground investigation， geophysical exploration， geological drilling of hydrogeological engineering and dynamic condition monitoring of karst collapse， and summarizes the distribution law and development characteristics of karst collapse in the study area， showing as follows， （1） Karst collapses mainly distribute in the intersection zone of trough and transverse gullies， low-lying areas or the surface along stream； （2） The formation and evolution of karst collapse shows the characteristics of expanding from low-lying place to high place， and gradually expanding from the core of tunnel drainage area to the periphery of the edge.Based on the analysis of the influencing factors of karst collapse， the formation and evolution of karst collapse in the study area is divided into three stages， the first two of which are at the peak of collapse. The main controlling factors inducing karst collapse are different in each stage. In the first stage， the karst collapse is mainly controlled by the effect of seepage subsurface erosion， and increasing load and softening effect. The sudden change of water and gas pressure in karst pipeline system is the secondary factor. In the second stage， the karst collapse is mainly controlled by the effect of seepage subsurface erosion and sudden change effect of water and gas pressure in karst pipeline system， and the increasing load and softening effect is the secondary factor. The collapse in this stage is characterized by a large number of relatively simultaneous occurrence . In the third stage， the karst collapse is mainly controlled by the effect of seepage subsurface erosion， increasing load and softening effect. The sudden change of water and gas pressure in karst pipeline system is the secondary factor.A comprehensive analysis shows that the karst collapse in the study area is rainfall karst collapse in the later stage of tunnel drainage. The precondition is that the regional groundwater level drops below the bedrock surface due to tunnel drainage. The main dynamic factors are the infiltration and seepage subsurface erosion caused by rainfall， the sudden change effect of water and gas pressure in karst pipeline system and the increasing load and softening effect. The formation and evolution process of karst collapse can be generalized as follows， rainfall → slope flow → surface ponding → increasing load and softening effect / seepage subsurface erosion / sudden change of water and gas pressure in karst pipeline system → soil collapse → soil cave expansion → karst collapse.

     

    • WU Yuanbin,LUO Weiquan,YIN Renchao,et al.Distribution law and genetic mechanism of karst collapse in Longquan village-Qingfengshan village, Chongqing[J].Carsologica Sinica,2021,40(06):932-942.
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