土压力计算中条间力函数的选取

Selection of Interslice Force Function for Computing Earth Pressures

极限平衡条分法计算挡土结构土压力时需要选取合适的条间力函数 ,目前采用的条间力函数具有理论缺陷 ,对此 ,选用 4种条间力函数进行了实例计算 ,表明 4种形式的条间力函数 ,可用于主被动土压力计算。研究还表明 ,只要满足端部条件 ,土压力值对条间力函数选取不甚敏感 ;另外 ,土压力合力作用点位置对主动土压力值影响较小 ,而对被动土压力值影响较大。

Selection of an appropriate interslice force function is required for the computation of lateral earth forces by using limit equilibrium method of slices.Presently used interslice force functions have the theoretical defect.Therefore,four kinds of the functions were used in case calculation and it is found the four forms of interslice force function can be used for calculating the active and passive earth pressures.The study also indicates that the magnitude of earth pressure is not very sensitive to the selection of interslice force function as long as this function satisfies the boundary conditions.Moreover,the location of the point of action of the resultant earth pressure has negligible influence on the magnitude of active earth pressure,but significantly affect the magnitude of passive pressure.