郑家坪变形体变形机制与稳定性分析

Analysis on Deformation Mechanism and Stability of Zhengjiaping Deformation Slope

以郑家坪变形体为工程实例,通过现场地质调查、探硐及钻孔勘探等手段,对变形体的变形演化过程、变形破坏特征及成因机制等进行分析。根据变形特征将变形体划分为Ⅰ、Ⅱ、Ⅲ区,根据其岩体倾倒变形的强烈程度分为"碎裂松动变形带"、"强烈倾倒变形带"和"弱倾倒变形带"三种类型,确定了变形体的变形机制为"倾倒变形强烈→工程开挖改造+蓄水改造+降雨入渗→致使变形加剧"。基于该变形体的变形破坏特征及成因机制提出合适的变形破坏模式,采用SLIDE软件中的摩根斯坦-普莱斯法对变形体进行稳定性分析。

This paper takes Zhengjiaping deformation as engineering example, through field geological survey, explora- tion tunnel and drilling exploration and other means, deformation evolution process, deformation destruction characteristics and genetic mechanism are research and analysis of the deformation slope. According to deformation characteristics, the deformation slope is divided into Ⅰ、Ⅱ、Ⅲ area. According to the intensity of toppling deformation in the rock,it can be divided into three types： ＂broken loose deformation zone＂, ＂strong dumping deformation zone＂ and ＂weak dumping deformation zone＂. The deformation mechanism of the deformation slope is determined as ＂the toppling deformation is strong, engineering excavation andreconstruction qwater storage transformation q- rainfall infiltration, the aggravation of deformation＂. Based on the deformation destruction characteristics and genetic mechanism of the deformation slope, a suitable deformation failure mode is proposed. Morgenstern-Price method is used to analyze the stability of the deformation slope in the SLIDE software.