镇江大杨林岩溶塌陷及地裂缝灾害机理分析

Mechanism Analysis of Karst Collapse and Ground Fissures Disasters in Dayanglin,Zhenjiang

镇江大杨林地区发生的民房墙体开裂、地面裂缝等地质灾害现象,从破坏特征看,应属地面塌陷和地裂缝共同作用的结果。根据地质调查资料,辅以物探(CSAMT法)、钻探、槽形钻等工程勘查手段,基本查明了该地区内地质灾害发生的地质环境背景、形成条件及影响因素,重点分析了岩溶塌陷及地裂缝的形成机制。认为地下水开采是诱发岩溶塌陷的主要因素,并由此引发了居民区墙体及地面开裂,地表水入渗侵蚀与持续干旱天气促进了农田地裂缝的形成。

Civil houses wall cracks, ground fissures and other geological disasters phenomena oc- curred in Dayangli region of Zhenjiang, which should be the results of the joint action of ground subsidence and ground fissures from the point of view of destruction features. We basically iden- tified geological environment background, formation conditions and influence factors of the geo- logical disasters with some engineering investigation and survey means, such as drilling, slotted drilling and so on, analyzed the causes and mechanism of geological disaster, especially the ground fissures in different positions. Results show that groundwater exploitation is the main factors of ground subsidence induced by karst collapse, which caused the the wall and the floor cracking, and surface water ground fissures. In the end, infiltration erosion and continuous appropriate prevention and control dry weather promoted farmland measures were suggested.