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经典土压力理论仅能计算平移模式挡墙的极限状态土压力。采用以主应力差表示的应力圆,根据应力路径三轴试验中得到的径向应力–应变关系,建立非极限状态下受位移影响的土体内摩擦角、墙土间摩擦角发挥值随位移的变化关系,并提出有效位移面积比方法将该关系量化至转动变位模式挡墙。在此基础上,应用水平层分析法和改进的库仑公式,推导出考虑挡墙变位影响的非极限土压力合力及其作用点位置、土压力分布计算式。研究表明:按有效位移面积比方法进行量化后,理论计算值与实测值相对误差较小;所提出的公式较好地反映了土压力随位移的变化规律,能够分析不同变位模式下的非极限土压力,可作为库仑理论公式的有效推广。
The classical theory of earth pressure can only calculate the limit state earth pressure of the translation mode retaining wall. Based on the stress-strain relationship obtained in triaxial test of stress path, a stress circle with stress difference is used to establish the internal friction angle of soil affected by displacement in non-limit state. The value of friction angle between wall and soil varies with displacement The relationship between the displacement and the effective displacement area ratio is quantified to the rotational displacement model retaining wall. Based on this, the horizontal layer analysis method and the improved Coulomb formula are used to derive the formula of the non-limit earth pressure force and its action point position and earth pressure distribution considering the displacement of retaining wall. The results show that the relative error between the theoretical calculated value and the measured value is small when the effective displacement area ratio method is used for quantification. The proposed formula can better reflect the variation law of earth pressure with displacement, The limit earth pressure can be used as an effective extension of Coulomb’s theoretical formula.