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通过对挡土墙背后滑动主体的力和力矩平衡分析，推求出土压力合力作用点位置的解析公式，并与按库仑理论的计算公式进行比较。从理论上证明土压力合力作用点的不稳定性并推导出计算公式。所得公式可用于实际工程设计。
By analyzing the force and moment balance of the sliding body behind the retaining wall, the analytic formula for the position of the earth pressure interaction point is deduced and compared with the formula based on Coulomb theory. It is proved theoretically that the point of earth pressure exertion instability and deduced the formula. The formula can be used for the actual engineering design.