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不论挡土墙填料采用砂性土,还是黏性土,其墙背主动土压力与墙体倾角和位移关系存在较大的联系,因而研究黏性土填料下的非极限主动土压力计算理论具有重要意义。通过应力状态分析给出了非极限状态下考虑土拱效应的侧向主动土压力系数,然后采用水平微分层析法给出了倾斜墙下非极限主动土压力解析解。通过与室内模拟试验及已有理论进行对比,验证了该方法的合理性。最后研究了相关参数包括位移比η,墙土摩擦角与内摩擦角之比δ/φ,墙体倾角g,黏聚力c等对主动土压力分布及其作用点高度的影响。结果表明:土体由静止状态向极限主动土压力状态发展时,土拱效应的影响会越来越大。随着δ/φ的不断增大,土压力分布曲线非线性强度会不断增强,土压力合力作用点高度呈上升趋势,并且δ/φ对土压力的影响会随着位移比η的增大而增大。随着挡土墙墙背倾斜角度ε的不断增大,土拱效应对非极限主动土压力的影响减小。随着土体填料黏聚力的不断增大,上部张拉裂缝高度也会随之增加,且土压力合力作用点越低。给出的考虑土拱效应的非极限主动土压力计算方法对于丰富挡土墙土压力计算理论具有重要意义。
Regardless of the use of sandy soil or clay, the active earth pressure on the back wall of the retaining wall has a great relationship with the inclination and displacement of the wall. Therefore, the study of the theory of the calculation of the non-limit active earth pressure under the condition of Significance. The lateral active earth pressure coefficient considering the soil arching under the non-limit state is given through the stress state analysis. Then, the analytical solution of the non-limit active earth pressure under the inclined wall is given by the horizontal differential tomography. By comparing with the indoor simulation test and the existing theory, the rationality of this method is verified. Finally, the effects of relative parameters such as displacement ratio η, ratio of wall friction angle to internal friction angle δ / φ, wall inclination g, cohesion c on the distribution of active earth pressure and the height of its action point are studied. The results show that soil arching effect will be more and more significant when the soil develops from the static state to the limit active earth pressure. With the increase of δ / φ, the nonlinear strength of earth pressure distribution curve will increase continuously, and the height of earth pressure force increases upward. And the influence of δ / φ on earth pressure will increase with the increase of displacement ratio η Increase. With the increasing of the back tilt angle ε of retaining wall, the effect of soil arching on the non-limit active earth pressure decreases. With the increasing of cohesion of soil filler, the height of the upper tensile fracture will also increase, and the lower the point of earth pressure combined action. The given non-limit active earth pressure calculation method considering soil arching is of great significance for enriching the earth pressure calculation theory of retaining wall.