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通过受力分析严格论证了土条浸润线下等体积水的重力与外表面水压力合力为渗透力。由此得土坡稳定分析中正确考虑渗流作用的方式是:当以水土混合体为研究对象时,应考虑土体周围孔隙水压力而不考虑渗流力;以土骨架为研究对象时,应考虑渗流力而不考虑孔隙水压力;用孔隙水压力分析时须与土体饱和重相对应,用渗流力分析时须与土体浮重相对应。将均质各向同性土体的稳定渗流场中流线简化为平行于浸润线的直线簇,分别将水土组合体和土骨架作为研究对象,经严格的力学分析和数学推导,得到渗流作用下经典土坡稳定分析方法中Fellenius法和简化Bishop法的安全系数求解公式,由所得的安全系数计算公式的对比分析可知,两种方法在本质上是一致的。实例计算结果及其与严格条分法计算结果的对比分析证明,考虑渗流作用的方法在Fellenius法和简化Bishop法滑坡分析中可行。
Through the force analysis strictly demonstrated that the soil subsidence line under the equal volume of water gravity and the external surface water pressure force as penetration. Therefore, the correct way to consider the seepage action in the stability analysis of the slope is that when considering the soil-water mixture as the research object, the pore water pressure around the soil should be considered irrespective of the seepage force. When the soil skeleton is the object of study, Seepage pressure without considering the pore water pressure; when using pore water pressure analysis, it must correspond with the saturated soil mass; when analyzing the seepage force, it must correspond with the soil floating weight. The flow line in the stable seepage field of isotropic isotropic soil is reduced to a straight line cluster parallel to the infiltration line. The soil-water combination and the soil skeleton are taken as the research objects respectively. After rigorous mechanical analysis and mathematical derivation, The formulas of solving the safety factor of Fellenius method and simplified Bishop method in the stability analysis of the classic soil slopes are compared. The comparative analysis of the formulas for calculating the safety factor shows that the two methods are essentially the same. The comparison between the calculated results and the calculated results of rigorous bifurcation method proves that it is feasible to consider the seepage action in the Fellenius method and simplified Bishop method.