摘要
滑带土抗剪强度是滑坡稳定性分析和防治工程设计中十分重要而又难于确定的参数之一。因此,基于临界状态假定的二维反分析方法得到了广泛应用。但是,自然界发生的滑坡基本上呈三维形态,其主滑方向有时变化也较大,使得有必要研究一种滑带土抗剪强度的三维反分析方法和滑坡稳定性的三维评价方法。笔者建议了一种基于强度折减概念的滑带土抗剪强度反分析方法,即通过逐步折减滑动面的强度参数,使滑动面的塑性区完全贯通,此时,塌滑体处于极限状态,所用强度参数即为滑带土的平均抗剪强度参数。从洪家渡水电站1#塌滑体计算成果来看,反演的滑带土摩擦角较二维反演值低4.1,反映了滑坡体的三维效应,验证了所建议方法的可行性。
The shear strength of slip soils is one of the prominent, but hard to be determined parameter in the stability analysis and control design of landslides, so 2-dimensional back analysis method is extensively used, which is based on the critical state assumption of slides. However, basically all the landslides are 3 dimensional in shape, and their major sliding direction changes drastically in some cases, thus making it necessary to develop a method for the 3D back analysis of slip soil strength and for the 3D stability analysis of the slide. A back analysis method, which is based on the strength reduction technique, is proposed. That is, the shear strength is obtained by gradually reducing the strength parameters to make the whole slip surface into plastic state (critical state). A case history, the No.1 landslide of Hongjiadu Hydroelectric Project, is examined by the method, with back-analyzed friction angle 4.1 lower than that from 2D analysis. 3D effect of the landslide is demonstrated and the method is thus proved feasible.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2003年第6期896-900,共5页
Rock and Soil Mechanics
基金
国家自然科学基金项目(编号:50279051)
国家重点基础研究发展规划项目(编号:2002CB412702)
中科院武汉岩土力学研究所领域前沿基金项目(编号:Q110215)资助。
