拱坝坝肩稳定性的地质力学模拟研究  

GEOMECHANICAL MODELING STUDY ON STABILITY OF ARCH DAM SHOULDER

作　　者：李天斌[1,2] 

机构地区：[1]成都理工大学环境与土木工程学院 [2]地质灾害防治与地质环境保护国家专业实验室成都610059

出　　处：《岩石力学与工程学报》2004年第10期1670-1676,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：四川省杰出青年学科带头人培养计划(03ZQ026-045)资助项目

摘　　要：为了论证和评价澜沧江小湾水电站拱坝坝肩岩体的稳定性,特别是软弱面(带)对坝肩稳定性的影响,采用相似材料三维嵌合块体地质力学模型试验,对坝肩岩体在开挖、工程荷载和超载条件下的变形破坏特征以及破坏机制进行研究,并评价坝肩岩体的稳定安全度和超载能力。In order to demonstrate and evaluate the stability of rock masses for the arch dam shoulders of Xiaowan power station on Lancang River in China, a three-dimensional geomechanical model test was conducted to study the features and mechanism of deformation-failure of the rock masses of right dam shoulder under the condition of excavation, designed load and overload, and to evaluate its stability and overloading capacity. The test result proves that attentions should be paid to the partial stability of the slope at the upper reaches with excavation. Under designed load, there isn't any cracking in the rock masses and the compressed deformation of the weak zones is restricted in the distribution range of accessional stress caused by designed load. When the load is exceeded up to three times, the minute fissures begin to appear at the upper reaches of the dam foundation. The stability of the dam shoulder is mainly controlled by the deformation of weak zones and the deformation-failure process of the dam shoulder can be described by 3 stages, namely, beginning crack of dam foundation, compressed crack of dam shoulder and large deformation of dam shoulder. There is sufficient safety storage in the dam shoulder's rock masses because its safety degrees under the normal case and the instable deformation are 3.0 and 7.0, respectively.

关 键 词：拱坝 坝肩稳定性 岩体力学 模型试验 地质力学模拟 小湾水电站 

分 类 号：TV642.45[水利工程—水利水电工程]