Research on high arch dam overall stability under complicated geological conditions and the impact analysis on weakening effect of weak structure strength

被引：0
|
作者：
Xiao Z. [1 ]
Yang B. [1 ]
Zhang L. [1 ]
Li Z. [1 ]
Chen J. [1 ]
机构：
[1] State Key Lab. of Hydraulics and Mountain River Eng., College of Water Resources & Hydropower, Sichuan Univ., Chengdu
来源：
Sichuan Daxue Xuebao (Gongcheng Kexue Ban) | / 20-26期
关键词：
Finite element analysis; Geomechanical model test; High arch dam; Overall stability; Strength weakening;
D O I：
10.15961/j.jsuese.2016.s2.004
中图分类号：
学科分类号：
摘要：
In order to evaluate the engineering safety of Jinping I high arch dam after reinforcement, the weakening rates of the weak structure strength under different conditions were obtained by the water-rock coupling triaxial test. On this basis, the geological mechanics model test with synthetic method was conducted, in which the weakening scheme with an average weakening rate 30% of fracture zone was considered. In order to explore the influence of weakening effect of weak structural plane strength to overall stability, 3D nonlinear finite element calculation and analysis were done for the fracture zone with an average weakening rate of 30% (Scheme 1) and the fracture zone with decreased and influenced strength (Scheme 2). The results showed that under normal operating conditions, displacement of the dam of scheme two is greater than scheme one about -0.2%~2.24%, abutment displacement value is greater than scheme one about -2.35%~1.72%, and displacement of the dam is greater than scheme one about -4.68%~9.23% under overload conditions. The displacement of dam and abutment resistance body, failure process and mechanism of the two schemes are similar, the numerical values are basically the same, and the test and calculation results are similar. For model test of Jinping I high arch dam, using the plan which concentrately reducing the strength 30% of broken zone to imitate the plan which reducing the strength of broken zone and the influenced zone separately can be considered as according with the actual situation and reasonably practicable, and its test results are reliable. © 2016, Editorial Department of Journal of Sichuan University (Engineering Science Edition). All right reserved.
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页码：20 / 26
页数：6
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