抽水诱发的基岩潜山型地裂缝高风险区模拟预测  

Simulation and prediction of high-risk areas of buried-hill-controlled earth fissures induced by groundwater exploitation

作　　者：季婷媛 张丹[1] 王光亚[2] 施斌[1] 

机构地区：[1]南京大学地球科学与工程学院,南京210023 [2]江苏省地质调查研究院(国土资源部地裂缝灾害重点实验室),南京210018

出　　处：《工程勘察》2017年第12期24-29,共6页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金(41272315);国家自然科学基金重点项目资助(41230636)

摘　　要：长期超采地下水是诱发地裂缝的重要因素之一。为了揭示由地下水开采诱发基岩潜山型地裂缝的成因机制,预测地裂缝发育的高风险区,根据无锡某一典型的工程地质剖面,采用FLAC3D接触面单元模拟地裂缝,建立了包含21个接触面单元的数值模型;分析了地下水开采过程中土体的变形特征,依据接触面的开度变化,对地裂缝的高风险区进行了预测。模拟结果表明,对于基岩面起伏、压缩层厚度不均匀的地层,地裂缝的高风险区位于基岩潜山山脊的上方。通过与现场调查结果的对比,验证了本文所提出的采用FLAC3D接触面单元预测地裂缝高风险区的方法是可行的和有效的。Long-term overexploitation of groundwater plays a vital role in the occurrence and development of earth fissures. In order to reveal the mechanism of groundwater exploitation on the formation of buriedhill-controlled earth fissures and predict its high-risk areas,a FLAC^3 D numerical model including 21 interface elements was established according to a typical geological profile at Wuxi. The characteristics of soil deformation during the process of ground-water exploitation were analyzed and a prediction of high-risk areas of earth fissure was made based on the opening degree of interfaces. The numerical simulation results show that the earth fissures is apt to form above the ridge of buried hill of bedrock for the strata with uneven compression layers. The numerical results are consistent with the field observations,and the feasibility and effectiveness of earth fissures modeled by interface elements of FLAC3 Dare verified.

关 键 词：地裂缝 FLAC^3D 接触面单元 基岩潜山型 抽水 

分 类 号：P642.26[天文地球—工程地质学]