抗滑桩护壁外壁形态对土拱效应影响的数值模拟

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。

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

In order to reveal the influences of morphology of protecting wall of anti-sliding pile on soil arching effect,the paper introduced the morphology coefficient h of protecting wall of anti-sliding pile,numerical simulations 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 extreme,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.