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Formation process of cover collapse sinkholes related to groundwater level decline in karst areas

Journal of Mountain Science 2024年第11期21卷 3832-3846页

作者： LIU Xingzong CHEN Hongkai GONG Bin JIANG Guanghui WANG Jintao School of Civil Engineering Ludong UniversityYantai 264025China School of Geographical Sciences China West Normal UniversityNanchong 637001China College of Engineering Design and Physical SciencesBrunel University LondonLondon UB83PHUK

The decline in groundwater level is a key factor contributing to cover collapse in karst *** this study,the model tests and numerical simulations are conducted to reveal the breeding process and formation mechanism of cover collapse sinkholes caused by the decline of groundwater level in karst ***,the model tests confirm that the decline of groundwater level generates negative pressure at the lower edge of overlying *** negative pressure experiences four distinct phases during the groundwater drawdown process:rapid rise,slow decline,rapid decline,and gradual *** maximum negative pressure is influenced by the particle size distribution of the overlying ***,the numerical simulations are carried out to investigate the change process of negative pressure caused by the loss of fillers in karst *** simulated results indicate that the rate of groundwater decline and the thickness and initial void ratio of the overlying soil can affect the maximum negative *** groundwater level drops,a negative pressure zone forms underground,causing tensile failure in the surrounding soil and creating an arched soil hole,which weakens the support for the overlying *** phenomenon can also lead to the collapse of the overlying soil under its *** table decline in karst areas can result in both internal and surface *** the overlying soil is thin,internal and surface collapses occur *** contrast,for thick overlying soil,internal collapse happens first,followed by a layer-by-layer collapse,ultimately forming ***,the breeding process and formation mechanism of the Yujiawan Reservoir sinkholes are *** conditions and groundwater level decline significantly affect internal collapse in karst areas,requiring careful consideration from on-site engineers.

关键词： Cover collapse sinkhole groundwater level decline Karst area Model test Numerical simulation

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