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《Journal of Central South University(Science and Technology)》 2019-05
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Water inrush mechanism for slip instability of filled karst conduit in tunnels

HUANG Zhen;LI Shijie;ZHAO Kui;WU Rui;ZHONG Wen;School of Resources and Environment Engineering, Jiangxi University of Science and Technology;School of Earth Sciences and Engineering, Nanjing University;Sate Key Laboratory for Geomechanics & Deep Underground Engineering,China University of Mining and Technology;  
In order to investigate the water inrush mechanism for slip instability of filled karst conduit in tunnels, a fundamental geological model and the mechanical transitive model of the conduit slip were established by assuming the karst conduit as a plug. The instability criteria for the karst conduit and an equation to calculate the safety factor of the karst conduit were deduced. Influences of the conduit inclination and the water level of the aquifer on the safety of karst conduit were investigated. The results show that the karst conduit of low permeability or impermeable plays a role as a plug that has strong water blocking effects, and it leads to water inrush induced by the conduit slip. Conduit slip and then water inrush occur when the sliding force exceeds anti-sliding force. The safety factor of the karst conduit decreases with the increase of water level of the aquifer. The influence of conduit inclination on safety factor is less significant than that of the water level. The safety of karst conduit is strongly related to groundwater. Seepage pressure, hydrostatic pressure and uplift pressure are the key factors to cause conduit slip and water inrush.
【Fund】: 国家重点基础研究发展规划(973计划)项目(2013CB036001);; 国家自然科学基金资助项目(41702326 41602294);; 博士后创新人才支持计划项目(BX201700113);; 国家博士后科学基金资助项目(2017M620205);; 江西省自然科学基金资助项目(20171BAB206022);; 中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金资助项目(SKLGDUEK1703);; 江西省教育厅科学技术研究资助项目(GJJ160675)~~
【CateGory Index】: U457
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