考虑外围结构存在的静止土压力计算

Calculation of Earth Pressure Considering Periphery Structrue

以市政工程中检查井为研究对象,考虑存在周围沉井,其受到的是两者之间有限土体产生的土压力,以半无限体为假设条件的土压力计算理论将不再适用。为计算检查井所受的土压力,沿深度方向取水平薄层作为微分单元体,通过对作用在微分单元体上的水平力和竖向力的平衡条件分析,建立了有限静止土压力的微分方程,推导出了有限静止土压力的理论公式,并与实测值及朗肯静止土压力进行了比较。在此基础上,分析了有限土体宽度、土体内摩擦角、土与结构摩擦系数以及地表荷载对有限土压力的影响。

The earth pressure against the inspection wells is due to the limited soils between the inspection wells and the open caisson. The earth pressure theories based on semi-infinite space assumption are not suitable for calculating the earth pressure of limited soils. The differential equations of first order are set up by considering the equilibrium of the force on the flake element taken out from the limited soils. The formula for calculating the earth pressure of limited soils is deduced and the effect of width of limited soil,the friction angle,friction coefficient between structure and soil and pressure are investigated.