土石坝振动孔压影响因素的研究

摘要

利用作者提出的土石坝三维非线性有效应力地震反应分析方法及相应计算程序，对土石坝振动孔压的一些影响因素rn进行了研究，结果表明：随地震加速度幅值、卓越周期和地震波形的不同，坝内孔压分布各异，故正确确定地震动参数很重rn要；考虑孔压消散和扩散与否所得出的孔压分布明显不同，考虑孔压消散和扩散的有效应力分析方法更切合实际，这对中等rn和高透水性的坝基和坝料尤为重要；边界排水条件不同，坝内孔压不同，故保证边界排水良好，可降低孔压，提高坝体的抗rn震稳定性.%The 3-D nonlinear effective stress response analysis method and correspondingrncalculation program are proposed to study the influence factors of seismic pore water pressurernin earthrock dams. Since the amplitude, predominant period and wave shapes of ground motionrnmay significantly affect the seismic pore water pressure, the determination of therncharacteristic parameters of ground motion is very important. The study results show thatrneffective stress seismic response analysis method, in which the dissipation and diffusion ofrnseismic pore water pressure are considered, is reasonable. In view of the seismic pore waterrnpressure may vary greatly, keeping the drainage in good condition is effective in improving thernseismic stability of earth-rock dams.