粘性土基于室内模型试验土压力分布形式的研究

Research on Distribution of Earth Pr essure of Clay Obtained from Model Test in Laboratory

针对朗肯土压力理论与实际相差较大,本文以粘性土为材料,在室内采用悬臂支护,模拟基坑开挖过程,量测开挖过程中土压力及支护结构位移的变化,与朗肯理论对比,得出总主动土压力实测比理论小约11%;被动区在坑下(0.15～0.2)倍开挖深度范围内,实测值与理论值接近,其下小于理论值,总被动土压力实测比理论小约24%;在试验基础上,建议了一种粘性土土压力分布形式。

Because of much difference existing between Rankine' s theory and reality,this paper does some research on model test in laboratory,and discusses the distribution of earth pressu re of clay on cantilever retaining structure .Earth pressure and deformation of structu re were measured during the process o f the test.Comparing with Rankine' s theory,total active earth pressure measure d in test is 11percent less than the th eoretical value.In passive zone,wi thin the(0.15～0.2)times of depth of the excavation,the measured values are much closer to th e theoretical values.Beneath this depth,the test values are less t han the theoretical ones and the tota l passive earth pressure is about 24p ercent less than that of the theory.Based on experimental results,a new distributio n model of earth pressure of clay has b een suggested.