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墙背土压力分布与挡土墙的位移大小、位移模式以及平衡状态密切相关。针对绕墙底向外转动的刚性挡土墙,基于已有的土压力计算理论,结合由卸荷路径三轴试验所建立的填土内摩擦角与挡土墙位移间的关系,提出一种改进的考虑位移影响的主动状态土压力计算方法。分析表明:随着挡土墙位移的发展,墙背土压力由静止土压力逐步减小,当挡土墙位移达到临界值后,相应的墙背土压力均收敛到库仑主动土压力。填土内摩擦角发挥值的分布显著影响墙背土压力分布。非极限平衡状态时,墙背土压力大于库仑主动土压力。
The earth pressure distribution on the back wall is closely related to the displacement of the retaining wall, the displacement mode and the equilibrium state. Aiming at the rigid retaining wall rotating outwardly around the wall base on the existing theory of earth pressure calculation and the relationship between the internal friction angle and the displacement of retaining wall established by the unloading path triaxial test, Improved Calculation Method of Earth Pressure in Active State Considering Displacement Effect. The analysis shows that with the development of retaining wall displacement, the pressure on the back wall gradually decreases from the rest earth pressure. When the retaining wall displacement reaches the critical value, the corresponding back wall earth pressure converges to Coulomb’s active earth pressure. The distribution of internal friction angle played a significant role in the distribution of wall pressure. In the non-limit equilibrium state, the earth pressure on the back wall is greater than the coulomb active earth pressure.