本文利用变分技巧将传统的极限平衡法与拉格朗日(Lagrange)乘子法相结合,建立用于确定挡土墙后c-φ-γ型填土临界滑裂面及主、被动土压力的基本计算公式;在理论分析及数值计算的基础上,探讨对土体极限状态及相应土压力影响的各种参数及其组合,提出土压力的表达通式,并给出可供实用的有关图表。 In this paper, we use the variational technique to combine the traditional limit equilibrium method with the Lagrange multiplier method to establish the critical sliding surface and the main and passive earth pressures of the c-φ-γ type backfill on retaining walls. Based on the theoretical calculations and numerical calculations, various parameters and combinations of the influences on the ultimate state of the soil and the corresponding earth pressure are discussed, and the expression formula for the earth pressure is proposed, and the related practical information is given. chart.