漆水河倒虹西坝滑坡分析及治理措施

Analysis on Landslides in West Dam of Qishuihe Inverted Siphon in Shaanxi Province and Measurements to Its Treatment

通过对漆水河倒虹西坝不同时间不同部位滑坡调查分析,归纳出西坝滑坡的机理和原因。分析表明:西坝段筑坝材料主要是马兰黄土和离石黄土,它们具有架空结构和湿陷性,遇水强度降低明显,这些特性是形成土坝滑坡的内因;降雨和倒虹管渗漏水、附近农民开挖坡脚是形成滑坡的外在原因;另外西坝滑坡到了老年期,多次滑坡形成的裂隙和滑动面是持续滑动形成的促进因素。根据以上原因提出了五项防治西坝滑坡的综合治理措施,供同类工程参考。

Through investigation and analysis on the landslides in different times and positions in the west dam of Qishuihe Inverted Siphon in Shaanxi Province,the mechanism and causes for the landslides are induced.It is indicated with analyses that Malan loess and Lishi loess,as the main materials for the dam construction,have such the characteristics as the interspaces,collapsibility and intensity lowering with water,which make up the internal causes of the landslides;the rainfall,leakage water of the inverted siphon and nearby peasents excavating the slope base are the external causes of the landslides;in addition,the fissures and slide surfaces formed by the landslides for many times are the promoted factors for the continuous landslides.According to the above causes,five integrated treating measurements for controlling the landslides in the west dam are put forward to provide some references for similar projects.