曲线破裂面下考虑土拱效应的挡土墙主动土压力  

ACTIVE EARTH PRESSURE ON RETAINING WALL WITH CYCLOID RUPTURE SURFACE OF SOIL CONSIDERING SOIL-ARCHING EFFECTS

作　　者：鹿兴[1] 彭蓉[1] 朱凯[1] 

机构地区：[1]中国工程物理研究院计量测试中心,四川绵阳621900

出　　处：《工业建筑》2016年第10期102-108,共7页Industrial Construction

摘　　要：库仑理论假定挡土墙后填土破裂面为一直线,然而众多试验和理论表明墙后填土破裂面为一曲线。考虑土拱效应,并假设土体破裂面为旋轮线,土拱形状为圆弧形,根据应力分析得到了侧土压力系数的表达式,利用水平层分析法,推导出挡土墙在平动模式下主动土压力的分布、总土压力和总土压力作用点高度的计算式,并用模型试验与现有理论进行对比。结果表明:挡土墙主动土压力计算结果与模型试验结果吻合,侧土压力系数与直线破裂面结果有明显差异,当墙土间摩擦角与土体内摩擦角比值较大时,总土压力比库仑理论计算结果大。According to Coulomb＇s theory,it was assumed that the inclination of slip surface behind retaining wall was a plane. But a number of laboratory and field tests proved that the inclination of slip surface was actually a curved surface. Considering soil-arching and assumed that soil-arching took the form of circle and the inclination of slip surface behind retaining wall was a cycloid,the lateral pressure coefficient was obtained through stress analysis,a numerical calculation formula was derived to calculate the distribution of active earth pressure,as well as the resultant force and its acting points location. The proposed method was compared with the existing methods and experimental data. The result showed that the calculating results of proposed method were in consistence with the results of model test,the lateral pressure coefficient had obvious differences between the proposed method and the existing methods,when the ratio of frictional angel of wall-soil and the internal frictional angle of soil was larger,the resultant force would be larger than the result obtained through Coulomb＇s theory.

关 键 词：土拱效应 挡土墙 旋轮线破裂面 主动土压力 

分 类 号：TU476.4[建筑科学—结构工程]