复杂地质条件下多结构面对重力坝坝基稳定性的影响及处理

›› 2014, Vol. 35 ›› Issue (S1): 328-333.

复杂地质条件下多结构面对重力坝坝基稳定性的影响及处理

李美蓉^{1, 2}，陈媛^{1, 2}，张林^{1, 2}，杨宝全^{1, 2}

1. 四川大学水力学与山区河流开发保护国家重点实验室，成都 610065；2. 四川大学水利水电学院，成都 610065

收稿日期:2013-11-08 出版日期:2014-06-10 发布日期:2014-06-20
通讯作者: 陈媛，女，1973年生，博士，副教授，主要从事水工结构工程教学和研究工作。E-mail: chenyuan8899@163.com? E-mail:limeirong0803@163.com
作者简介:李美蓉，女，1990年生，硕士研究生，主要从事水工结构工程及其基础工程方面的研究
基金资助:
国家自然科学基金面上项目资助（No. 51379139）；国家自然科学基金青年基金资助（No. 51109152）；四川大学青年教师基金资助（No. 2012SCU11061）。

Impacts of multi-structural planes on gravity dam foundation stability and treatment under complex geological conditions

LI Mei-rong^{1, 2}, CHEN Yuan^{1, 2}, ZHANG Lin^{1, 2}, YANG Bao-quan^{1, 2}

1. State Key Laboratory of Hydraulics and Mountain River Development and Protection, Sichuan University, Chengdu 610065, China; 2. College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China

Received:2013-11-08 Online:2014-06-10 Published:2014-06-20

摘要/Abstract

摘要： 武都重力坝坝基地质条件复杂，发育有断层、层间错动带等多种不利地质构造，且结构面相互交错组合形成多条潜在滑移面，坝基深层抗滑稳定问题突出。为了研究多结构面对坝基深层抗滑稳定的影响及加固处理，结合武都重力坝19#坝段，建立了三维数值模型进行有限元分析。首先，对坝基中各软弱结构面的力学参数进行敏感性分析，研究影响坝基稳定的主要因素，揭示了坝踵处倾向下游的10f2、F31断层对坝基抗滑稳定影响较大，应进行重点加固处理。在该基础上，在断层10f2、F31拟定不同深度的混凝土置换，对断层置换混凝土的深度进行敏感性分析，得出不同置换深度下坝基的超载稳定安全系数。结果表明，断层10f2、F31的置换深约19 m时可以达到良好的加固效果，位移和应力值得到良好的改善，坝基塑性区域明显减小，抗滑稳定安全系数得到明显提高，并满足设计规范要求。研究成果对武都重力坝工程的加固处理提供了重要的科学依据，对类似工程的稳定分析与加固处理具有参考价值。

关键词: 重力坝坝基稳定, 多结构面, 混凝土置换, 敏感性分析, 有限元计算

Abstract: Foundation of Wudu gravity dam has the complex geological conditions, developed many adverse geological structures including faults and interbed shear zones. The stability of dam foundation is very serious due to the potential natural sliding paths formed by these interlaced planes. In order to study the impacts of multi-structural planes on foundation stability and reinforcement measures, a 3D numerical computation is conducted to analyze the typical dam section #19 of Wudu project by means of finite element method(FEM). First, the sensibility analysis is performed to study the impacts of various weak structural planes on stability. It reveals that the dam stability is severely affected by faults 10f2 and F31 incline downstream from dam heel, and the reinforcement measures should be taken and focus on the faults 10f2 and F31. On this basis, another sensibility analysis of concrete replacement depth is also conducted. Through varying the concrete replacement depths for faults 10f2 and F31, the corresponding safety factors are obtained. Results show that the reasonable replacement depth for faults 10f2 and F31 is about 19 m which can achieve favorable reinforcement effect; deformation and stress of dam have been improved; plasticity states of the dam foundation has been significantly reduced; the safety factor of anti-sliding stability is significantly improved; and the requirement of design specification is satisfied simultaneously. These research results provide an important scientific basis for the reinforcement of Wudu project, and also have the reference value for the stability analysis and reinforcement treatment of other similar projects.

Key words: stability of gravity dam foundation, multi-structural planes, concrete replacement, sensibility analysis, finite element calculation

中图分类号:

TV 64

李美蓉，陈媛，张林，杨宝全 , . 复杂地质条件下多结构面对重力坝坝基稳定性的影响及处理[J]. , 2014, 35(S1): 328-333.

LI Mei-rong , CHEN Yuan , ZHANG Lin , YANG Bao-quan , . Impacts of multi-structural planes on gravity dam foundation stability and treatment under complex geological conditions[J]. , 2014, 35(S1): 328-333.

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