A review of karst collapse mechanisms

JIANG Xiaozhen; FENG Tao; ZHENG Zhiwen; LEI Mingtang; ZHANG Wei; MA Xiao; YI Xiaojuan

doi:10.11932/karst20230304

2023 No. 3

Article Contents

Article navigation > Carsologica Sinica > 2023 > 42(3): 517-527

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JIANG Xiaozhen, FENG Tao, ZHENG Zhiwen, LEI Mingtang, ZHANG Wei, MA Xiao, YI Xiaojuan. A review of karst collapse mechanisms[J]. Carsologica Sinica, 2023, 42(3): 517-527. doi: 10.11932/karst20230304

Citation:

JIANG Xiaozhen, FENG Tao, ZHENG Zhiwen, LEI Mingtang, ZHANG Wei, MA Xiao, YI Xiaojuan. A review of karst collapse mechanisms[J]. Carsologica Sinica, 2023, 42(3): 517-527. doi: 10.11932/karst20230304

A review of karst collapse mechanisms

1.
Key Laboratory of Karst Collapse Prevention, Institute of Karst Geology, CAGS, Guilin, Guangxi 541004, China
2.
China Railway Eryuan Engineering Group Co., Ltd., Chengdu, Sichuan 610031, China
3.
Guangdong Institute for Geo-Environment Monitoring, Guangzhou, Guangdong 510510, China

Received Date: 10 September 2022

Publish Date: 25 June 2023

Abstract

Abstract

Karst collapse is a global geohazard and has been reported to occur in 23 countries, including China, the United States of America, Canada, South Africa, Italy, France, the United Kingdom, Germany, Russia, and Turkey. The mechanism of karst collapse is the basis for its monitoring, early warning, prevention and treatment. For a long time, studies on the mechanism of karst collapse have been mainly based on the qualitative speculation of the investigation after karst collapse, involving geological conditions and influencing factors of the collapse. They lack support of scientifically defensible data, hence resulting in the hypothetical stage of current studies on karst collapse mechanism. This has become a technical bottleneck in the prediction and prevention of karst collapse hazard.
Karst collapse hazards are characterized by concealment and suddenness. Among the existing collapse events in China, more than 90% are soil collapse. Studies on karst collapse in China started in the 1980s and have gone through approximately four phases, (1) The sporadic karst collapse research in selected mines; (2) The karst collapse inventory and small-scale physical modeling in Yangtze River Basin, and representative mines and railroads; (3) The karst collapse reconnaissance and large-scale physical modeling in urban areas including Wuhan, Yulin, Tangshan, Tongling, Guilin, and Shenzhen; (4) The systematic nation-wide karst collapse reconnaissance. Since 2000, National Natural Science Foundation of China has increased investment in the studies on karst collapse involving groundwater pumping, foundation piling, tunneling, drainage in mines, and train vibration and in the studies on karst collapse mechanisms induced by extreme climate. At present, there are about eight karst collapse mechanisms according to previous studies, such as subduction, vacuum negative pressure, pressure difference, hydraulic fracturing, gas explosion, chemical dissolution, resonance, liquefaction, etc. These processes are closely associated with changing underground hydrodynamic conditions.
With a profound analysis of definitions and theoretical basis of karst collapse mechanism, this study proposes that most of the above mechanisms can be attributed to seepage deformation of soil. This means, under the action of groundwater seepage force or dynamic water pressure, some particles of the whole soil mass will move, causing deformation and destruction of soil or rock mass. During the formation of karst collapse, the action mode and direction of groundwater seepage force on karst cavities roof soil will be different because of the change of groundwater dynamic conditions. The limit equilibrium theory of soil mechanics considers the roof stability of karst cavities, which is the last stage in the development of karst collapse; the effect of surface load is only to shorten the time of ground collapse.
Finally, it is pointed out that due to the practicability of water-air pressure with high-frequency sampling, accelerometer and acoustic wave sensors, the research direction on collapse mechanisms will be changed from hydrostatic pressure to hydrodynamic pressure, a challenge that should be faced with. The cavitation damage and resonance damage caused by pressure pulsation will also be the future research focus, and the corresponding critical seepage deformation or damage indicators need to be further studied the prevention and control of geological disasters of karst collapse.
- karst collapse /
- formation mechanism /
- seepage deformation /
- hydrodynamic pressure /
- cavitation damage /
- resonance damage

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References

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