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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 ,提高坝体的抗震稳定性
Some influencing factors of rock pore pressure of rockfill dam are studied by using the method of three-dimensional nonlinear effective stress response analysis of earth-rock dam proposed by the author and the corresponding calculation program. The results show that with the difference of earthquake acceleration amplitude, excellent period and seismic waveform Therefore, it is very important to correctly determine the ground motion parameters. Considering the pore pressure distribution obtained by dissipating and diffusing pore pressure is obviously different, it is more practical to consider the effective stress analysis method of pore pressure dissipation and diffusion. This is especially important for medium and high permeability dam foundation and dam materials. Different boundary drainage conditions result in different pore pressures in the dam, which ensures good drainage of the boundary, reduces pore pressure and increases the seismic stability of the dam.