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墙背土压力分布与挡土墙的位移大小和转动模式密切相关。针对绕墙底向外转动的刚性挡土墙,基于土压力形成机制的分析及已有的研究成果,建立挡土墙位移与墙背土体内摩擦角发挥值之间的关系式,反映了墙背土体内摩擦角随着挡土墙位移的增加而渐进发挥的过程。在此基础上,提出一种改进的考虑位移影响的主动土压力计算方法。计算结果表明,随着挡土墙位移的增大,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于库仑主动土压力。墙底背面土压力也是随着挡土墙位移的增长而逐步收敛于库仑主动土压力。与模型试验结果对比表明,理论计算值与试验实测值基本吻合。
The earth pressure distribution is closely related to the size of the retaining wall and the rotation mode. Based on the analysis of the formation mechanism of earth pressure and the existing research results, the relationship between the displacement of retaining wall and the value of friction angle of wall-soil is established. Back soil friction angle with the retaining wall displacement increases and gradually play the process. On this basis, an improved calculation method of active earth pressure considering the influence of displacement is proposed. The calculation results show that with the increase of the retaining wall displacement, the pressure of the back wall soil gradually decreases from the resting earth pressure. When the retaining wall displacement reaches the critical value, the corresponding wall back earth pressure converges to the coulomb active earth pressure. The earth pressure on the back of the wall also gradually converges to the coulomb active earth pressure with the increase of the retaining wall displacement. The comparison with the model test results shows that the theoretical calculation value is in good agreement with the experimental value.