侧压力系数变化时均布条形载荷下的塑性区

Plastic zone induced by band-distributed-load considering change of lateral earth pressure coefficient

根据弹性理论和Mohr-coulomb准则,导出了侧压力系数变化时均布条形载荷下地基中塑性区的控制方程。根据方程可以确塑性区的范围,发展趋势和应力演变过程。与文献给出的假设侧压力系数等于1时塑性区的确定方法相比,本法所确定的塑性区稍深,而且随载荷增大两侧相对独立向下发展且连体趋势不明显;当载荷达到某一值时,塑性区深度将迅速加深而宽度却基本不变。

Based on elastic： theory and Mohr-Coulomb criterion, formulas are established to determine soil＇s plastic zone under band distributed-load with change of lateral earth pressure coefficient taken into account for isotropic soils. Compared with the results by the method presently utilized, the depth of plastic zone by the proposed method in this paper is larger. It is known that the shape of the plastic zone and the gap between them will change with increasing load when the presently utilized method is used. But this trend is not clear when the proposed method is employed.