龙家岩多级滑坡形成机理分析及防治技术探讨

Characterization and Mitigation of the Longjiayan Multi-Staged Landslide

在我国西部地区,由于受特殊的地形地质条件影响,滑坡灾害已成为制约地区经济持续稳定发展的因素之一,其中多级滑坡由于其形成机理复杂,在工程建设中往往造成计算所得的剩余下滑力过大,导致治理非常困难;以贵州省沿河县沙子镇龙家岩多级滑坡为例,通过野外调研、钻探、深部位移监测等资料着重分析了滑坡的形成机理,以此为据采用分级治理的思路对滑坡作了稳定性评价,提出了以抗滑桩为主的治理方案,最后采用ANSYS软件对h型抗滑桩的受力特征进行了有限元计算。该分析思路对类似工程的研究具有参考价值。

The conventional design methods for estimating the sliding forces in the multi-staged landslides are usually over conservative due to their complexity.As a result of the excessively large driving forces,the mitigation scheme usually becomes very difficult.This paper presents a case history of the Longjiayan landslide mitigation.The landslide characterization was performed and the multi-staged mitigation program was selected based on the stability analysis results.The drilled piers were utilized to resist the potential sliding and the performance of the ＂ h＂ typed drilled piers was analyzed by using the commercial finite element software ANSYS.