莱芜市岩溶塌陷原因分析与评价

Analysis and Evaluation of Karstic Collapse in Laiwu City

莱芜市孟公清—西泉河一带石灰岩溶洞裂隙发育 ,局部与上覆砂砾石层直接接触 ,形成“天窗” ,在矿区超采地下水及矿山疏干排水影响下 ,地下水下渗携带砂砾石进入灰岩溶洞裂隙中 ,突发岩溶塌陷。 1973～ 1997年共塌陷 139处 ,塌陷面积 6 4 35m2 ,致使 132 4户民房开裂 ,32 8户报废。根据 1997年在莱芜市的矿山地质勘察工作成果 ,采用综合指数法对评价区进行了预测评价 ,将评价区划分为岩溶塌陷区、预测岩溶塌陷区和不具备塌陷条件区 ,并根据岩溶塌陷产生的原因和规律 ,提出针对性的防治建议 。

By using synthentic indices method, predication and evaluation are carried out in evaluation areas. These areas are divided into karstic collapse area, predicating karstic area and area without karstic collapse condition. According to origin and rule of karstic collapse, prevention countermeasures and suggestions are put forward in this paper, which will provide basis and experience for prevention of karstic collapse.