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为考虑土拱效应对深基坑围护桩内力与变形的影响,以成都地区深基坑工程为依托,采用颗粒流数值计算方法,研究了深基坑开挖过程中土拱产生、发展的细观机理.然后,进一步深入研究了桩间距、桩半径、距径比、摩擦系数等因素对桩土相互作用力的影响.研究表明:随着桩土相互作用力的增大,土拱形成于两桩之间,拱高约为桩间距的0.5倍;考虑土拱效应的土压力计算值与实测值相符,相比朗肯土压力计算值偏小约14.9%;随着桩距径比的增加,桩土相互作用力逐渐减小,而桩间土受力线性增大;桩土相互作用力随摩擦系数增加而近似线性增大,摩擦系数提高0.5倍,桩土相互作用力约增大0.7倍.
In order to consider the effect of soil arching on the internal forces and deformation of retaining piles in deep foundation pit, based on the deep foundation pit project in Chengdu, numerical simulation method of particle flow was used to study the occurrence and development of soil arching during deep foundation pit excavation Meso-mechanism.Furthermore, the effects of pile spacing, pile radius, radius-to-diameter ratio, friction coefficient and other factors on pile-soil interaction force are further studied.The results show that with the increase of pile-soil interaction force, Between the two piles, the arch height is about 0.5 times of the pile spacing. The calculated earth pressure considering the soil arching effect is consistent with the measured value, which is 14.9% less than the Rankine earth pressure. With the pile diameter-to-diameter ratio The interaction force between pile and soil increases linearly; the interaction force between pile and soil increases approximately linearly with the increase of friction coefficient, the friction coefficient increases 0.5 times, and the interaction force between pile and soil increases about Big 0.7 times.