鱼简河拱坝坝肩岩体稳定性分析  

ROCK MASS STABILITY ANALYSIS OF ABUTMENTS OF YUJIANHE ARCH DAM

作　　者：张宜虎[1] 尹红梅[1] 王亮清[1] 

机构地区：[1]中国地质大学工程学院,湖北武汉430074

出　　处：《岩石力学与工程学报》2005年第18期3305-3310,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：中国地质大学校优秀青年教师资助计划项目(CUGQNL0513)

摘　　要：鱼简河拱坝坝肩岩体内断层、节理及软弱夹层发育,存在安全隐患。首先,在现场勘察和室内外试验的基础上,确定右坝肩1 034 m高程以上块体为最危险块体;然后,采用极限平衡法和三维有限单元法对此块体分别进行稳定性计算,极限平衡法计算所得块体在校核工况下稳定性系数为2.0,有限单元法计算所得块体在相应工况下稳定性系数为3.0,两者存在较大差异,故从物理和力学模型上对差异产生的原因进行了分析,发现有限单元法因屈服准则选取不合适导致稳定性系数计算结果偏高,而极限平衡法因夸大了拱端作用力导致稳定性系数计算结果偏低;最后,综合确定块体稳定性系数为2.4,未达到规范要求,建议对右坝肩1 034 m高程以上块体采取相应的治理措施。The abutments of Yujianhe Arch Dam have hidden trouble to their safety because there exist many faults, joints and weak seams in the rock mass. Based on in-situ investigation and testing, it could firstly be decided that the block above the elevation of 1034 m in the right abutment was the most dangerous one. Then, the 3D limit equilibrium method （LEM） and the 3D finite element method （FEM） were both used to calculate the stability coefficient of the block. The results got from the two methods were different, the first was 2.0, and the second was 3.0. To get the true result, the two methods were compared in physical model and mechanical model, and it was then found that the result of FEM was on the high side because of the yield criteria, and the result of LEM was on the low side because the load of dam was magnified in this method. By analyzing systematically, the final stability coefficient 2.4 was given out, which couldn＇t meet the requirement of the criteria, so it was suggested that the block should be treated.

关 键 词：岩土力学 坝肩岩体 稳定性 极限平衡法 有限单元法 

分 类 号：TU457[建筑科学—岩土工程]