云阳龙洞抗滑桩加固边坡局部失稳机制研究

通过开展未加固边坡、初步加固设计、变更加固设计、推荐加固等条件下边坡及加固稳定性的研究对比,探讨了三峡库区云阳龙洞抗滑桩加固边坡的失稳机制。研究结果表明,龙洞滑坡抗滑治理失效有2个主要原因:(1)非饱和土边坡基质吸力的丧失和重度的增大使得边坡安全系数大大降低;(2)加固设计没有针对该边坡上部和下部存在的两个都会导致局部失稳的滑动面进行有效地加固。同时研究表明,文中推荐的加固方案能够较好地控制两个局部滑动面,使得边坡整体和局部均处于稳定状态,可取得良好的加固效果。

Analysis of local sliding mechanism of Longdong slope reinforced with stabilizing piles

In order to analyze the sliding mechanism of Longdong slope reinforced with piles, by making use of the developed strength reduction finite element codes, the both local and global stability of unsaturated soil slope are analyzed. Four kinds of reinforced measures are combined according to the installed position of stabilizing piles and matric suction. The comparison of results not only evaluate the influence of matric suction losses on the stability of slope, but also analyze that the two local sliding surfaces in upper and down slope may result in local instability if without the proper reinforced position of piles. In addition, the recommended design which could control the two local sliding surfaces works more effective than the other reinforced measures.