摘要
对该水电站坝址区陡立反倾板状结构岩体而言,纵向河谷的地形特征,使坝址两岸边坡大范围发育倾倒变形。针对该水电站倾倒变形问题,在掌握坝址区工程地质条件背景的基础上,通过对岩体倾倒变形基本特征及破裂程度分级等分析,建立边坡离散元的工程开挖和破坏机理的数值计算模型,得出了工程开挖边坡岩体倾倒变形特征和变形破坏机理发展过程为:初期弱倾倒变形岩体的层内剪切错动、强倾倒变形岩体的层内拉张变形、强倾倒变形岩体的切层张-剪破裂及极强倾倒破裂岩体的折断张裂(坠覆)破裂。研究结果为倾滑体的稳定性评价及工程开挖施工提供一定科学依据。
Steep and antithetic platy structure of rock mass and geomorphology of the longitudinal valley in the dam site area cause wide-range toppling deformation on the cross-strait slope. Aimed at solving problems of toppling deformation, the authors, in the light of regional engineering geological conditions, analyzed characteristics of toppling rock mass deformation, made degree classification of toppling ruptures, established discrete element slope models for excavation and failure mechanism, and detected characteristics of the excavated slope and four developing processes of failure mechanism. There exist shear dislocation in weak toppling rock deformation, tensile deformation on layers in strong toppling rock deformation, strain-shear rupture through layers in strong toppling rock deformation and tensile fracture on very strong toppling rock rupture. The results provide a scientific basis for stability evaluation of the dip-slip, body and the excavation work.
出处
《中国地质》
CAS
CSCD
北大核心
2009年第4期907-914,共8页
Geology in China
关键词
工程开挖边坡
破坏机理模型
倾倒变形
离散单元法
excavated slope
failure mechanism model
toppling deformation
discrete element method
