非极限状态下挡土墙主动土压力及土拱数值计算

Earth pressure and soil arching on retaining wall under non-limit state

利用有限元分析方法,研究平动位移模式、非极限状态刚性挡土墙的土压力和小主应力拱。结果表明,非极限状态下,墙后土体存在梯形状相对位移区,其大小随墙体位移增大而增大。非极限状态挡土墙土压力呈凸曲线分布,墙体位移大,总土压力小,总土压力作用点到墙底的高度为0.28～0.36倍墙高。非极限状态下墙后土体的小主应力拱曲线为指数曲线：墙体位移小,曲线曲率较大;墙体位移大,曲线较平缓。

Based on finite element analysis, we research the active earth pressure and soil arching on the retaining wall under non-limit state. The results show that there is a relative displacement region shaped as trapezoid behind the retaining wall and it increases as the displacements of the retaining wall increases under the non-limit state. The active earth pressure behind the wall presents a convex curve distribution. As increasing of the displacement of the wall, the integrity of active earth pressure increases and the distance from the action point of the integrity of the active earth pressure to the wall heel is about 0. 28 to 0. 34 times high of the wall. The curve of the soil arching behind the wall under the non-limit state is an exponential function： the base and the curvature decreases with the increase of the wall＇s displacement.