强排水条件下矿区岩溶地面塌陷的工程地质评价

Engineering Geologyic Evaluation of the Karstic Ground Subsidence in the Mining District Under the Condition of Forced Drainage

基于对强排水条件下矿区岩溶塌陷的地质结构要素和水文地质特征分析 ,确立了岩溶塌陷地段地质结构模型 ,并建立了相应的岩土力学模型。该模型耦合了重力、吸蚀和渗流作用。通过定量分析 ,得到了相应的塌陷判据 ,并用安全因数Fs 来表征溶蚀空间上覆盖层的安全性。据此思路 ,可将岩溶塌陷工程地质评价由定性引向定量 。

Based on the analysis of the geological structural elements and the hydrogeologic features of the karst collapse in the mining district under the condition of forced drainage, a model was established to simulate the geologic structure of the karst collapse area. Also, a corresponding geotechnical model was established which couples such factors as gravity, sucking erosion and seepage. Judgment criteria for karst collapse were obtained through quantitative analysis. Further, safety performance of the overburden above the corrosion cavity was evaluated using a safety factor F s . Therefore,engineering geologic evaluation of karst collapse can be quantitative , not limited to being qualitative, so as to raise the precision of prediction of the collapse area.