抗滑桩护壁外壁形态对土拱效应影响的数值模拟

Numeric simulation of the influences of morphology of protecting wall of anti-sliding pile on soil arching effect

为揭示抗滑桩护壁外壁形态对土拱效应的影响规律,引入抗滑桩护壁外壁形态系数h,采用平面应变有限元方法,在不同抗滑桩外壁形态参数h下,研究了桩周及桩后土体位移、应力等因素的变化规律。研究结果表明:土拱效应的发挥程度,桩周土体的应力和变形与桩体外壁的形态有关。在h为4 cm、8 cm时,桩周土体的应力、位移变化量最大,增强了土拱的抗滑效用;当h大于8 cm时,桩周土体的应力、位移变化量随着h的增加逐级递减;当h接近极值时,桩周土体中的应力、位移变化不大,此时抗滑桩护壁外壁形态对土拱效用起不到积极作用。

In order to reveal the influences of morphology of protecting wall of anti-sliding pile on soil arching ef-fect, the paper introduced the morphology coefficient h of protecting wall of anti-sliding pile, numerical simula-tions were carried out based on plane stain FEA models. Soil deformation and stress around piles were investigated to explain the influence of the morphology of protecting wall on pile-soil interaction. The results show that the soil arching effect of soil around pile, soil stress and deformation are correlated to the morphology of the outer wall of pile. When h=4 cm or 8cm, the change of soil stress and displacement increases obviously, which enhances soil arching effect; when h〉 8 cm, soil stress and displacement decrease with h gradually; when h is close to the ex-treme, the stress of soil and displacement around pile change little, in this case, the morphology of the outer wall of anti-sliding pile on soil arching effect does not play a positive role.