基于ANSYS的悬臂式抗滑桩桩前被动土拱效应影响因素研究

摘要

基于水平集中力作用下的明德林应力解,推导出了相邻两桩桩前土体某一深度平面内任意点的附加应力表达式,运用MATLAB计算得到应力等值线的分布,分析了被动土拱效应随桩间净距、桩宽和桩前距离的变化规律.并通过ANSYS对被动土拱效应的影响因素进行了数值模拟分析.计算结果表明:在一定桩身水平位移和桩间距下,相邻两桩桩前会产生被动土拱效应,且随着桩间距的增加,被动土拱效应减弱,土拱范围先增大后减小;随着桩前距离的增加,被动土拱效应减弱.%The additional stress expression of arbitrary point in the plane of a soil depth in front of the two adjacent piles is deduced based on the Mindlin stress solution under the action of horizontal concentrated force.The distribution of stress contour is obtained using MATLAB,analyzing the rules of passive soil arch effect varying with clear distance between piles,pile width and distance in front of the pile.And the numerical simulation analysis for the influence factors of the passive soil arch effect is carried out through ANSYS.The results show that the passive soil arch effect will produce in front of the adjacent two piles under a certain horizontal displacement of pile and pile spacing and the passive soil arch effect weakens with the increase of pile spacing,but the range of soil arch increases at first then decreases.With the increase of distance in front of piles,the passive soil arch effect decreases.