强降雨作用下填土滑坡的失稳机理及加固处理措施研究

Research on the instability mechanism and treatment measures of the filled soil Landslide under heavy rainfall

云南阳宗海西侧某职业学院填土边坡去年雨季发生滑坡,强降雨入渗导致的地下水渗流与土层软化作用构成了滑动的主要促发因素。变形分析和稳定性计算揭示滑动面主要形成于填土与残坡积层分界面。运用基于有限差分原理的Flac3D软件来对该滑坡体进行分析,研究房屋加载与无加载时边坡的应力及位移场分布对滑坡的影响。应急处置按照"应急工程先行,防止恶化;永久治理,不留后患"的滑坡防治原则,采用旋挖桩预加固稳坡、抗滑桩与排水等综合治理措施,取得良好效果。

A filled soil landslide occured at a vocational college on western embankment of Yangxong lakein Yunnan last rainy season. The groundwater seepage and the obvious reduction in the shearing Strengthof the filled soid,both of which were caused by the infiltration of a heavy rainfall,are considered the trig-gering factors of the landslide. Deformation analsis and stability calculation revealed that the sliding zonewas formed mainly along the interface between the filling layer and the residual soil layer. The measure ofthe rotary drilling pile has been taken to reinforce slope stability in advance,and anti-sliding piles togetherwith the measure of reducing the slope load and drainage system have been completed finally,and an effec-tive result has been achieved.