【摘要】 采用非线性有限单元法和笔者曾提出的动孔压试验曲线法,对某深厚黄土覆盖层上土石坝进行了有效应力法地震响应分析,重点分析大坝的绝对加速度、动位移和动应力等动力响应及动孔隙水压力分布情况。分析结果表明,在现有设计条件下,由于坝基软弱黄土覆盖层较厚,大坝在7度地震作用下地震响应不强烈,但坝基黄土覆盖层会出现液化情况,需采取相应的抗液化工程措施。更多还原

【Abstract】 The 2D non-linear effective stress FEM and test curve method for calculation of dynamic pore water pressure which was suggested by the second author are applied to analyze the dynamic response of an earth-rockfill dam on thick loess alluvial deposit,with emphasis on the distribution characters of absolute acceleration,dynamic displacement,dynamic stress and dynamic pore water pressure.The calculation results show that the dynamic response of the dam is not strong because of the soft deep loess alluvial deposit,but the loess alluvial deposit will be liquefied under the earthquake with intansity of 7 degree on the present design condition.Therefore,the resistance method of liquefaction should be adopted for the loess foundation.更多还原