四川大学学报：工程科学版2011，Vol.43Issue(5)：71-76,6.
复杂岩基上高拱坝坝基坝肩浅层卸荷影响与稳定性研究
Study on Influence of Dam Foundation Shallow Unloading and Stability of High Arch Dam with Complicated Rock Foundation
摘要
Abstract
Considering the influences of shallow unloading and relaxation rocks,a 3D geo-mechanical model test and 3D nonlinear FEM calculation were carried out to study the global stability of high arch dam and foundation of Xiaowan Project,using different sizes and mechanical parameters of rhombus small blocks.At the same time,the main geological structures and the reinforcing schemes at the dam abutment and dam foundation were simulated.In order to carry out strength-decreasing test,the major weak structural planes were simulated using temperature analogous material.The shallow unloading zone of dam foundation was simulated using dense element.The model tests and calculations showed that the rocks nearby the dam heel and dam toe cracked firstly（corresponding to model test） or appeared plastic zone firstly（corresponding to calculation）,affected by the shallow unloading rocks in the process of overloading test,and finally the crack or the plastic zone transfixed nearby the upstream dam heel,which showed the shallow unloading rocks have a certain influence on the stability of dam and foundation.关键词
坝基浅层/开挖卸荷/地质力学模型试验/有限元计算/整体稳定性Key words
shallow foundation/excavation unloading/geo-mechanical model test/finite element calculation/global stability分类
建筑与水利引用本文复制引用
杨宝全,张林,胡成秋,陈建叶..复杂岩基上高拱坝坝基坝肩浅层卸荷影响与稳定性研究[J].四川大学学报：工程科学版,2011,43(5):71-76,6.基金项目
国家自然科学基金资助项目 （）
国家重点基础研究发展计划资助项目 （）
博士学科点专项科研基金资助项目 （）
