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This paper investigated the effect of SWRC hysteresis on passive earth pressure. The study considered different suction profiles and soil-wall frictions for a rigid concrete retaining wall. A parametric study is carried out using a modified upper bound theorem, UNSAT-DLO approach, where the numerical results were validated against an extended Rankine equation based on the equilibrium limit method.本论文探究了土水特征曲线（Soil-Water Retention Curve, SWRC）滞后效应对被动土压力的影响。研究针对刚性混凝土挡土墙，考虑了不同的吸力分布与土-墙摩擦特性。本次研究采用修正的上限定理与UNSAT-DLO方法开展参数化分析，数值计算结果通过基于极限平衡法的扩展朗肯方程完成验证。