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一、引 言 目前在分析地震荷载下地基与堤坝的液化势和抗振稳定性时,常采用不排水条件下的总应力法.但对于排水条件较好以及振动时间较长的情况,则在振动期内不仅产生振动孔隙水压力(即超静水孔隙水压力.以下同),往往还伴随着孔隙水压力的消散与再分布.此时以采用有效应力法分析为宜. 以有效应力法分析水平土层和土坝,在地震水平剪应力作用下的液化势以及稳定问题,已有一定的研究.土体中扎隙水压力的分布规律可按具有孔压源项ψ的固结微分方程表示:
I. INTRODUCTION At present, the total stress method under undrained conditions is often used when analyzing the liquefaction potential and anti-vibration stability of foundations and dams under earthquake loading. However, for the case of better drainage conditions and longer vibration time, the vibration is During the period, not only vibratory pore water pressure (ie, excess hydrostatic pore water pressure. Same below) is often accompanied by the dissipation and redistribution of pore water pressure. It is appropriate to use the effective stress method for analysis at this time. Analyze the level using the effective stress method. Soil layers and earth dams have been studied for their liquefaction potential and stability under the action of horizontal shear stress. The distribution law of water pressure in soils can be expressed by the consolidation differential equation with pore pressure source term. :