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本文用有限元法对地震荷载和不同排水条件下陡河水库土坝砂基中孔隙水压力的增长与扩散过程,以及振动结束后孔隙水压力的重分布与消散过程进行了计算分析。通过动力三轴试验,给出了饱和砂的残余孔隙水压力的全量表达式和不同液化破坏阶段的临界孔隙水压力比的表达式。本文定义了液化势评价准则,并对该坝在1976年唐山大地震时的稳定性进行了分析。得到的结果能较好地说明宏观破坏现象,同时也表明砂砾井和砂砾层有明显的排渗作用。
In this paper, the finite element method is used to calculate the pore water pressure growth and diffusion process in earth dam sand foundation of Douhe Reservoir and the redistribution and dissipation process of pore water pressure after the end of the vibration. Through the dynamic triaxial test, the full expression of the residual pore water pressure of saturated sand and the expression of critical pore water pressure ratio in different liquefaction failure stages are given. This paper defines the liquefaction potential assessment criteria and analyzes the stability of the dam during the 1976 Tangshan earthquake. The obtained results can better explain the macroscopic damage phenomenon, and also show that the gravel wells and gravel layers have obvious percolation effect.