均布荷载作用下挡土墙后粘性填土的土压力计算

基于极限分析下限定理,导出了均布荷载作用下倾斜坡面挡土墙后粘性填土的侧向土压力的解析解,并通过具体数值计算以图表的形式给出了填土摩擦角、无量纲粘结力cγz、无量纲荷载强度qγz及填土表面倾角α等参数不同组合情况下的综合主动和被动土压力系数值,可供工程实践直接采用。在此基础上,就各参数对综合主动和被动土压力系数的影响进行了有意义的探讨

Earth pressure computations of cohesive backfill with inclined surface under surcharge by limit analysis

Rankine's theory of earth pressure can not be directly employed to the case of cohesive backfill with an inclined surface.For this practical case,it seems that no analytical solution is available.In this paper,a theoretical solution of active and passive earth pressures of cohesive backfill with an inclined surface under surcharge was developed on the basis of the lower-bound theorem of limit analysis.First,a statically-balanced stress field of the slope ground consisting of cohesive soils was constructed from elasticity theory.Then it was enforced to not violate the Mohr-Coulomb yield condition.According to the lower-bound theorem of limit analysis,two extreme values of lateral stress which respectively correspond to active and passive earth pressures were to be found and expressed in the superposition form.Based on a number of numerical computations conducted for different combinations of the key parameters related to the problem,the computed results useful for engineering practice were given in tabular and graphical forms.The effects of the main parameters on comprehensive coefficients of active and passive earth pressure were discussed.