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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。
Based on the Mindelin stress solution under the action of horizontal concentration, the additional stress expression at any point in a depth plane of two adjacent piles is deduced. The distribution of stress contours is obtained by MATLAB. The law of passive soil arching changes with the distance between piles, pile width and distance before pile. The influence factors of passive soil arching effect were analyzed by ANSYS. The calculation results show that the passive soil arching occurs in front of two adjacent piles at a certain horizontal displacement of pile body and the distance between piles. With the increase of pile spacing, the passive soil arching effect is weakened and the soil arching range first increases and then decreases Small; With the increase of the distance before the pile, passive soil arching weakened.