土工基础

›› 2015, Vol. 29 ›› Issue (1): 77-80.

• 工程实录 • 上一篇    下一篇

基于应力-渗流耦合的三维坝基抗滑稳定性分析

朱 超1 ，马士举2   

  1. （1.安徽省水利水电勘测设计院，安徽蚌埠 233000；2. 中铁西安勘察设计研究院有限责任公司，西安 710054）
  • 收稿日期:2014-11-05 出版日期:2015-02-20 发布日期:2015-03-13
  • 作者简介:朱超（1983-），男，工程师，研究方向为工程勘察、岩土工程设计。

Three Dimensional Coupled Stress-Seepage Sliding Stability Analysis of a Dam Foundation

ZHU Chao1, MA Shiju2   

  1. (1. Anhui Survey and Design Institute of Water Conservancy and Hydropower Co., Ltd., Bengbu Anhui 233000;
    2. China Railway Xi′an Investigation and Design Institute Co., Ltd., Xi′an 710054)
  • Received:2014-11-05 Online:2015-02-20 Published:2015-03-13

摘要： 向家坝水电站二期工程大坝坝基岩体抗滑稳定问题较为突出，坝基岩体的稳定性对整个水电站的正常运行具有至关重要的作用。针对该坝基典型坝段基岩在正常蓄水位工况下，采用三维强度折减方法进行抗滑稳定性分析，失稳判据采用常用的弹塑性计算不收敛和坝基关键点位移突变两种方法，计算结果表明：以计算不收敛得到的安全系数为3.62；以塑性区贯通和关键点位移突变作为失稳判据，则安全系数为3.2左右，且由当前参数计算得到的坝顶、坝踵与坝趾等三个特征点位移均指向下游方向，说明在该工况下坝体有向下滑动的趋势。

关键词: 坝基稳定, 强度折减法, 应力渗流耦合, 向家坝水电站

Abstract: One of the most serious problems in the design and construction of the Xiangjiaba Hydraulic Electricity Second Phase Project is the sliding stability of the dam foundation, which is critical to the safe operation of the entire pivot. The sliding stability is numerically analyzed using the strength reduction method for a representative section under the pool level conditions. The nonconvergence and the connection of the plastic zones are used in the analysis as the instability criteria. The analysis results indicate that a factor of safety of 3.62 using the nonconvergence criterion and a factor of safety of 3.2 using the connection of plastic zones are obtained, respectively. If the current strength parameters are used in the analysis, the characteristics displacements at crest, heel and toe are point to the downstream side. A sliding tendency can be found under the current conditions.[JP]

Key words: Dam Foundation Stability, Strength Reduction Method, StressSeepage Coupled Analysis, Xiangjiaba Hydropower Station