辽宁省凤城市某岩溶地面塌陷工程勘查及其致灾机理分析

INVESTIGATION OF A KARST GROUND GOLLAPSE GROJECT IN FENGCHENG CITY LIAONING PROVINCE AND ANALYSIS OF ITS DISASTER CAUSING MECHANISM

以辽宁省凤城市某矿业公司岩溶地面塌陷勘查工程为例,从矿区岩溶塌陷的地质背景入手,总结岩溶地面塌陷的致灾机理。通过地质调查、资料整理及钻探验证结果进行分析,结果表明,勘查区地质环境条件复杂;塌陷区具有分布空间形态复杂、不均一化的特点;该区岩溶塌陷形成条件是各种不良要素的共同作用;塌陷坑T1和塌陷坑T2形成原因主要为覆盖型岩溶区;塌陷坑T3和塌陷坑T4浅部10~25 m地层破碎,推测塌陷坑T3及塌陷坑T4为贯通塌陷坑。

Taking the karst ground collapse exploration project of a mining company in Fengcheng city,Liaoning province as an example,the disaster mechanism of karst ground collapse is summarized from the geological background of karst ground collapse in mining area.Through the analysis of geological survey,data collation and drilling verification results,the results show that the geological environment conditions in the exploration area are complex.The subsidence area has the characteristics of complex and uneven spatial distribution.The formation condition of karst collapse in this area is the joint action of all kinds of bad elements.The causes of collapse pits T1 and T2 are covered karst areas.The shallow part of the collapse pit T3 and the collapse pit T4 is 10~25 m fractured,and it is speculated that the collapse pit T3 and the collapse pit T4 are through-pass collapse pits.