冲压荷载下水泥路面土基的变形及应力分析

Deformation and Stress of Old Cement Concrete Pavement Base under Impact Load

通过建立有限元模型,采用瞬态动力学加载方法,模拟冲击压路机破裂稳固旧水泥混凝土路面的冲压效果,探讨冲压荷载作用下土基中的应力传递规律和沉降变形.结果表明:在土基顶面以下5 m深度处由冲压荷载引起的土基竖向应力和位移均接近于0,冲压荷载的影响深度不超过5 m;冲压荷载作用下路基的工作区为2.25 m深度范围内,埋深超过2.25 m的构造物理论上不受冲压荷载的影响.

Based on the transient dynamics method, the existing cement concrete pavement finite element model was established to simulate the cracking and seating effect of the impact roller. The stress transfer law and settle- ment deformation of the base under the impact load was studied. It showed that at the depth of 5 meters in the base, the vertical stress and displacement caused by impact load were close to 0. The effect depth of impact load did not exceed 5 meters. The work area of the base under the impact load was within the depth of 2.25 meters. Structures buried below the depth of 2.25 meters theoretically were not affected.