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以墙后为无黏性填土的刚性挡墙为研究对象,首先基于库仑滑裂面,假定墙后土拱为抛物线形拱,分别建立平动模式下水平微单元平均竖向应力、层间剪切力与主动土压力的定量关系,以考虑水平微单元层间剪切作用的影响,在此基础上由静力平衡方程推导出主动土压力解析解。然后将求解的主动土压力值与前人的研究成果进行对比,验证该方法的合理性。最后,对该解析解进行参数分析,发现墙土摩擦角与填土内摩擦角的比值是影响层间剪切作用强弱的主要因素。该方法能考虑挡墙后土体中应力偏转现象以及水平微单元体层间剪切作用,较传统土压力计算方法,能够更真实地反映土体中的应力状态。
Taking the rigid retaining wall behind the wall as the non-stick filling as the research object, firstly, based on the Coulomb slip surface, assuming that the soil arches behind the wall are parabolic arches, the average vertical stress of the horizontal micro-units in the translational mode is established respectively, The quantitative relationship between shear force and active earth pressure is taken into consideration in order to consider the effect of horizontal micro-unit shear. Based on this, the analytical solution of active earth pressure is deduced from the static balance equation. Then the value of active earth pressure solved is compared with the previous research results to verify the rationality of this method. Finally, parametric analysis of the analytic solution shows that the ratio of the friction angle between soil and soil to the internal friction angle of the soil is the main factor that affects the shear strength between layers. This method can consider the stress deflection in the soil behind the retaining wall and the shearing effect of the horizontal micro-unit body. Compared with the traditional method of earth pressure calculation, this method can more accurately reflect the stress state in the soil.