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Volume 41 Issue 1
Feb.  2022
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Article Navigation >  CARSOLOGICA SINICA  > 2022  >  41(1): 67-78
ZHOU Zheng,LI Dahua,LIAO Yunping,et al.Characteristics and formation mechanism of karst ground collapse in Zhongliangshan area, Chongqing[J].Carsologica Sinica,2022,41(01):67-78. doi: 10.11932/karst20220103
Citation: ZHOU Zheng,LI Dahua,LIAO Yunping,et al.Characteristics and formation mechanism of karst ground collapse in Zhongliangshan area, Chongqing[J].Carsologica Sinica,2022,41(01):67-78. doi: 10.11932/karst20220103
shu

Characteristics and formation mechanism of karst ground collapse in Zhongliangshan area, Chongqing

doi: 10.11932/karst20220103
  • 1.

    Technology Innovation Center of Geohazards Automatic Monitoring， Ministry of Natural Resources （Chongqing Institute of Geology and Mineral Resources）， Chongqing 401120，China

  • 2.

    Chongqing Engineering Research Center of Automatic Monitoring for Geological Hazards （Chongqing Institute of Geology and Mineral Resources）， Chongqing 401120，China

  • 3.

    College of River and Ocean Engineering， Chongqing Jiaotong University， Chongqing 400074，China

  • 4.

    Key Laboratory of Geological Hazards Mitigation for Mountainous Highway and Waterway under the Auspices of Chongqing Municipal Education Commission & Chongqing Jiaotong University， Chongqing 400074，China

  • 5.

    College of City and Architectural Engineering， Zaozhuang University， Zaozhuang，Shandong 277160，China

  • 6.

    Qinghai No.1 Exploration Institute of Nonferrous Geology， Xining，Qinghai 810000，China

  • 7.

    College of Civil Engineering， Chongqing Jiaotong University， Chongqing 400074，China

Funds:

 KJQN202000748

 KJ-2020007

  • Received Date: 2021-09-12
  • Publish Date: 2022-02-25
    Abstract
  • Zhongliangshan area， located in the west of the main city of Chongqing， seriously hinders the traffic development of this city， and hence affects its economic activities. In recent years， with the rapid development of Chongqing's economy as well as its traffic construction， a number of traffic tunnels and village roads have been planned and built in Zhongliangshan area. During their construction and operation， 327 ground collapses occurred， which seriously damaged the geological and ecological environment. Therefore， through the detailed geological investigation of the ground karst collapse in Zhongliangshan area of Chongqing， this study systematically analyzes the characteristics and formation mechanism of the collapse in this area. The results show that in terms of distribution characteristics， ground karst collapses are mainly distributed in the low-lying areas of Jialingjiang formation， the developing areas of faults and solution grooves， and the area slightly covered by silty clay. In terms of formation time， ground karst collapses mainly form during heavy rainfall and in the period when the groundwater level drops sharply due to the heavy drainage during tunnel construction. In Zhongliangshan area， the geological conditions for the formation of ground karst collapse are sufficient. Firstly， the limestone in Jialingjiang formation in Zhongliangshan area is pure in texture， and many faults and joints are developed. Secondly， the surface water and groundwater resources are abundant， and the intense karstification forms a large number of karst space， which provides favorable room for ground karst collapse. The intensive exchange of atmospheric precipitation， surface water and groundwater provides dynamic conditions for ground rock collapse. The Quaternary overburden with the characteristics of coarse structure at the bottom and fine structure at the top provides favorable conditions for the formation of karst collapse. The inducing factors of ground karst collapse mainly include the heavy drainage leading to the sharp drop of groundwater level in the process of tunnel construction， heavy rainfall and the construction and operation of village roads. There are four types of mechanical mechanisms of surface karst collapse， i.e.， latent erosion， vacuum suction， erosion of the increasing rainfall load and surface water， and load and vibration. The comparison of the number of collapses produced by different mechanical mechanisms shows that the ground karst collapse produced by latent erosion and vacuum suction is widely distributed with the largest number. Hence， these two factors are the main mechanical mechanisms of collapse in this study area. According to the collapse mechanical mechanism and inducing factors of ground karst collapse， it is proposed that the careful dynamic observation of groundwater in this study area should be conducted in the process of tunnel construction， so as to avoid rapid and excessive discharge of groundwater and to prevent the sudden drop of groundwater level. During heavy rainfall， a reasonable drainage system should be established to avoid the excessive accumulation of surface water flowing to low-lying places and to avoid the increase of the overburden self-weight. In the site selection of village roads and tunnels， geological survey should be strengthened to avoid unfavorable sections in karst development areas and in high incidence areas of ground collapse， so as to prevent the occurrence of ground karst collapse. These research results provide theoretical basis and technical support for the protection of geological environment in this area.

     

    • ZHOU Zheng,LI Dahua,LIAO Yunping,et al.Characteristics and formation mechanism of karst ground collapse in Zhongliangshan area, Chongqing[J].Carsologica Sinica,2022,41(01):67-78.
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