重庆忠县吊钟坝滑坡Ⅰ-2变形体启动机制探讨

Moving mechanism of Ⅰ-2 deformed block of Diaozhongba landslide in Zhongxian county of Chongqing

忠县吊钟坝滑坡Ⅰ-2变形体曾于1962年、1982年和1988年由于暴雨产生过三次强变形,2009年监测期间又发生一次4 m以上的滑移,但至今未发生整体失稳,具有一定的探讨价值。本文采用传递系数法对变形体稳定性进行了计算分析,结合监测数据和宏观变形,对其启动机制进行了探讨,研究表明暴雨工况下变形体稳定性显著降低,该变形体属于典型的推移式滑坡,但由于变形体前部滑体与土岩接触带有较长的平缓段,且厚度具有后部薄、前部厚的特征,使得前部阻滑作用显著而未发生整体失稳,为该类滑坡防治提供了一定的理论依据。

Ⅰ-2 deformation of Zhongxian Diaozhongba landslide had three times strong deformation in 1962,1982,1988 and a 4 m above slip took place during the 2009＇monitoring due to heavy rain,but there is no overall instability. Which has great research significance. In this paper,we discussed the deformation mechanism by means of transfer coefficient method to analyze the stability of deformation and combined with the monitoring data and the macroscopic deformation. The research shows that storm conditions make the deformation stability significantly reduced,and the deformation belongs to the typical progressive landslide. But as a result of the deformation front sliding contact zone with the soil and rock bands are a long flat section and the thickness of the rear is thin and the front is thick,the front anti-sliding stability is effective and not occur overall instability. Which offers certain theoretical basis to the design and reinforcement for this kind of landslide.