非对称剖面下胶凝砂砾石坝受力特征及破坏模式研究

Study on Stress Distribution and Failure Model of CSG Dam with Asymmetric Cross Section

为了研究非对称剖面的胶凝砂砾石坝在完建和正常蓄水时不同坡度对坝体的稳定性和安全性的影响,以山西守口堡胶凝砂砾石坝为例,根据模型试验建立应变软化模型,运用有限差分法对胶凝砂砾石坝体的受力特性进行分析,并采用水头超载法对不同剖面坝体的超载能力及破坏模式进行研究,得到不同剖面坝体的超载系数及破坏模式的规律。结果表明:随坝坡变缓,坝体位移和应力差别不大,坝体的超载能力逐渐增大;不同剖面坝体最先出现破坏位置不同,但坝体最终破坏模式相同,均表现为沿坝基面的贯穿性裂缝导致坝体整体失稳。

In order to study the influences of different slopes of Cemented Sand and Gravel （CSG） dam with asymmetric crosssection on the stability and safety of dam body after construction completion and normal water storage, the strain softening model is established based on actual engineering of Shoukoubao CSG dam in Shanxi Province, in which, the finite difference method is used to analyze the stress distribution of CSG dam, and the water overload method is used to study the critical loading capacity and failure model of dam with different cross section. The critical loading capacity value and the characteristics of failure model are getting. The results show that, （a） with the dam slope being flat, the displacement and stress of dam body has little difference, and the critical loading capacity increases gradually; and （b） the first damage position is different for dams with different cross section, but the final failure mode is same, that is the dam will be instable along the penetrating crack in dam foundation.