隧道施工扰动下黄土古滑坡复活机制及治理

Reactivation and Treatment of Loess Ancient Landslide Under Disturbance of Tunnel Construction

以某小净距隧道穿越黄土古滑坡工程为研究对象,采用现场地质调查、地质勘探和监控量测等方法确定了黄土古滑坡的地形形态与滑坡性质。在此基础上,采用理论方法分析了黄土古滑坡复活机制和采用现场监测和数值模拟方法分析了黄土古滑坡的稳定性,得出在坡脚被切割的情况下易引发牵引式滑坡。针对牵引式滑坡类型,提出了坡体卸荷和设置抗滑桩的治理方案,取得良好的效果,可为类似工程的治理提供参考。

Taking a certain small clear spacing tunnel passing through loess ancient landslide project as the study object,the technologies of field exploration and monitoring and measurement are applied to determine the form and nature of the loess ancient landslide. On this basis,reactivation mechanism of loess ancient landslide is analyzed,while field monitoring and numeric simulation are adopted to analyze the stability of loess ancient landslide,thus the paper draws a conclusion that it is easily lead to retrogressive landslide when the slope foot is cut down. Moreover,in allusion to the nature of retrogressive landslide,the treatment scheme of slope unloading and slide-resistant pile setting is proposed,with good effect achieved. This research can provide references for treatment in similar projects.