考虑土拱效应和黏聚力的倾斜挡墙非极限主动土压力

摘要

根据已有的非极限土体参数与墙体侧向位移和极限土体参数的关系,以及非极限滑裂土体的莫尔应力圆,获得非极限主动土压力的土压力系数,然后根据非极限微元滑裂土体的竖向和水平向静力平衡条件,获得考虑了土拱效应、墙背倾角、墙体侧向位移、墙土摩擦角、黏聚力等影响的墙背非极限主动土压力计算公式.墙背法向非极限主动土压力沿墙高的分布呈非线性,随墙体侧向位移比的增加而减小;墙背填土非极限临界深度随墙体侧向位移比的增加而增加,随非极限墙土摩擦角的增加而减小.%According to the available parametric relationship of the nonlimit soil and wall lateral displace-ment with the limit soil mass and the Mohr stress circle of nonlimit slide-wedged soil mass,the coefficient of the normal nonlimit active soil pressure was obtained.Then,according to the conditions of vertical and horizontal static equilibrium of nonlimit elementary slide-wedged soil mass,a computational formula of normal nonlimit active earth pressure on retaining wall back was derived,considering the influence of rele-vant parameters such as soil arching effect,wall-back inclination angle,wall lateral displacement,wall-to-soil friction angle,and internal cohesion of backfill.The vertical distribution of normal nonlimit active earth pressure on wall back will exhibit nonlinear and decrease with the ratio of wall lateral displacement. The nonlimit critical depth of wall back backfill will increase with the ratio of wall lateral displacement and decrease with the nonlimit wall-to-soil friction angle.