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针对刚性挡土墙,考虑转角位移比对非极限填土内摩擦角、墙土摩擦角的影响,假设小主应力土拱为圆弧,由摩尔应力圆得到墙背和滑裂面处的正、切应力;再根据RB模式下非极限微元滑裂土体的静力平衡条件,获得非极限主动土压力系数,进一步推导、得到非极限主动土压力计算式。参数分析结果表明:转角位移比从0增大到1过程中,非极限填土内摩擦角由静止内摩擦角逐渐增大到极限内摩擦角,非极限主动土压力及其系数逐渐减小;非极限主动土压力随着填土内摩擦角的增大而减小,其最大值随着墙土摩擦角的增大逐渐减小。与前人方法比较,文中的非极限主动土压力理论值与试验值吻合得更好。
For rigid retaining walls, considering the effect of rotational displacement ratio on the internal friction angle and wall friction angle of the non-limit fill soil, assuming that the small main stress soil arch is arc-shaped, And shear stress. Based on the static equilibrium condition of non-limit micro-sliding body under RB mode, the non-limit active earth pressure coefficient is obtained, and then the formula of non-limit active earth pressure is obtained. The results of parameter analysis show that the non-limit soil internal friction angle gradually increases from the static internal friction angle to the limit internal friction angle and the non-ultimate active earth pressure and its coefficient decrease gradually when the rotational displacement ratio increases from 0 to 1. The non-limit active earth pressure decreases with the increase of the internal friction angle, and its maximum decreases with the increase of the friction angle of the soil wall. Compared with the previous methods, the theoretical value of the non-limit active earth pressure is in good agreement with the experimental value.