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《Journal of Chongqing Normal University(Natural Science)》 2018-04
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Study on Mechanism of Ground Collapse in Soil Cover Over Karst Caves Triggered by Drop-down of Underground Water:Taking Ground Collapse at Yujiawan Reservoir in Mt. Gele of Chongqing City as an Example

CHEN Hongkai;WANG Shengjuan;SU Junjiang;HU Ting;College of Geology and Surveying and Mapping Engineering,Chongqing Vocational Institute of Engineering;Institute of Geotechnical Engineering,Chongqing Jiaotong University;  
[Purposes]Ground collapse mechanism of soil cover over karst cave triggered by falling of ground water is the scientific evidence to put into monitoring,pre-warning and governing for the disaster.[Methods]Based on investigation in field,mechanical mechanism and evolution model of soil cover over karst cave are discussed by limit equilibrium theory and Geomorphology method.[Findings]Geological model and mechanical model for soil cover ground collapse are established.One method to identify ground collapse of soil cover is produced,while potential criterion for the disaster is proposed.Further,the authors come up with the evolution model of ground collapse of soil cover over karst cave,i.e.,rapid drop-down of underground water level→ formation of initial cell with negative pressure→ enlarge process of cavity with negative pressure→ ground collapse process.[Conclusions]Case analysis identifies that results by the method established is consistent with the fact in field,which possesses popularization and application value on cholesterol levels.What needs to be stressed is that negative pressure triggered by rapid drop-down of underground water level plays the key role in the method.
【Fund】: 国家自然科学基金(No.51678097;No.51378521;No.11272185);; 重庆市首席专家工作室专项经费(No.201605);; 重庆市“两江学者”计划专项资金(No.201309);; 2016年重庆高校创新团队建设计划(No.CXTDG201602012);; 重庆市教育委员会重点实验室建设计划(No.ZDSYS201712)
【CateGory Index】: TU478
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