工程地质学报2026，Vol.34Issue(2)：795-804,10.DOI:10.13544/j.cnki.jeg.2024-0195
岩溶覆盖层正压顶托破坏机理试验研究
EXPERIMENTAL STUDY ON THE MECHANISM OF UPLIFT FAILURE IN KARST OVERBURDEN
摘要
Abstract
The change in groundwater level caused by reservoir impoundment is one of the primary factors inducing overburden failure in karst areas.Current studies on groundwater-induced overburden failure mainly focus on karst collapse,while the failure mechanism caused by groundwater uplift remains insufficiently investigated.To address this gap,a series of laboratory experiments were conducted to monitor gas pressure variations and overburden uplift displacement during groundwater level rise,with the overburden failure mechanism analyzed accordingly.The experimental results reveal the following:(1)The peak gas pressure is directly proportional to the overburden thickness when boundary conditions remain constant.In thin overburden,the peak gas pressure is relatively low,decreases gradually,and exhibits a"gradual"time-dependent curve.Conversely,in thick overburden,the peak pressure is higher and sustains for a longer duration,showing a"stepped"variation pattern.(2)The overburden deformation mode corresponds to the pressure changes.For thick overburden,"uplift"failure occurs,whereas thin overburden tends to fail in a"rupture"mode.(3)Building upon previous studies and considering the observed failure modes,a mechanical model was established to analyze the anti-destructive capacity and jacking force of the overburden.The critical thickness formulas for both failure types were derived.These formulas enable the determination of critical conditions for different failure modes under varying environmental conditions,offering both theoretical insights and practical applications.关键词
岩溶覆盖层/地下水水位/正压顶托/破坏机理/临界厚度Key words
Karst overburden/Groundwater level/Overpressure uplift/Failure mechanism/Critical thickness分类
建筑与水利引用本文复制引用
张令辰,卫云波,刘益南,黄韦杰,陆阳,郑克勋..岩溶覆盖层正压顶托破坏机理试验研究[J].工程地质学报,2026,34(2):795-804,10.基金项目
国家自然科学基金青年基金项目(资助号:42102282),贵州省科技支撑计划项目(资助号:黔科合支撑[2022]一般212),贵州省科技平台及人才团队建设计划项目(资助号:黔科合平台人才[2021]5635),江苏省自然科学基金青年基金项目(资助号:BK2021041973).This research is supported by the National Natural Science Foundation of China(Grant No.42102282),Guizhou Science and Technology Support Plan(Grant No.Guizhou Science and Technology Support[2022]General 212),Guizhou Science and Technology Platform and Talent Team Building Plan(Grant No.Guizhou Science and Technology Cooperation Platform Talent[2021]5635)and Jiangsu Provincial Natural Science Foundation Youth Fund Project(Grant No.BK2021041973). （资助号:42102282）
