摘要
亭子口水利枢纽大坝是红岩层地区最高的重力坝,坝基部位存在倾向下游且走向与坝轴线夹角较小的软岩、岩层层面和泥化夹层,以及顺河向的陡倾裂隙,因此亭子口重力坝存在较严重的深层抗滑问题。本文在结合坝基下覆岩层分布状态确定滑移模式的基础上探讨了坝基深层抗滑稳定性分析方法的适用性,并应用广义等K法和分项系数极限状态设计方法对亭子口重力坝表孔坝段的深层抗滑稳定性进行了深入研究,并在此基础上对广义等K法中的条块作用力与水平面的夹角φ对深层抗滑稳定性作了敏感性分析。两种稳定性计算方法的结果均表明亭子口重力坝表孔坝段深层抗滑稳定性基本能满足规范要求;广义等K法中条块作用力与水平面的夹角φ取值对深层抗滑稳定分析成果有显著的影响,建议在亭子口深层抗滑稳定分析中φ取5°～10°。
Tingzikou gravity dam,the highest gravity dam in the Hongyan rock areas in China,is located on a foundation with adverse soft rocks,bedding planes and weak seams dipping downstream.These adverse geological conditions result in a severe deep-seated sliding stability problem for Tingzikou gravity dam.By using a generalized limit equilibrium method developed by IWHR （all slices have the same value of factor of safety） and limit state design method suggested by Chinese Design Specification for Concrete Gravity Dams（DL 5108-1999）,the deep-seated sliding stability of a surface-outlet monolith was analyzed and the effect of inter-slice/inter-wedge force angel φ on the stability results was also investigated.The analysis results obtained by the above two methods indicate that the deep-seated sliding stability basically satisfies Chinese Design Specification for Concrete Gravity Dams （SL 319-2005） when φ=0°.When the inter-slice force angle is not equal to zero,the factor of safety increases with φ,with φ=5° to10° recommended for Tingzikou gravity dam.
出处
《中国水利水电科学研究院学报》
2011年第2期125-131,共7页
Journal of China Institute of Water Resources and Hydropower Research
基金
水利部公益性行业科研专项经费项目(200801005)
关键词
亭子口重力坝
深层抗滑
广义等K法
分项系数极限状态设计方法
Tingzikou gravity dam
deep-seated sliding stability
generalized limit equilibrium method
limit state design method
作者简介
徐佳成（1983-），男，福建三明人，博士生，主要从事岩土体稳定性研究。E-mail：xjc0828@126．com
