考虑空间效应作用下基坑围护结构变形数值计算研究

RESEARCH ON NUMERICAL CALCULATION OF DEFORMATION OF FOUNDATION PIT ENCLOSURE STRUCTURE WITH CONSIDERATION OF SPACE EFFECT

针对新建基坑边坡对楼座的沉降问题,在分析了其工程地质的基础上,对基坑开挖和设计时的岩土工程问题进行了分析,对基坑开挖进行了模拟。模拟结果发现,围护结构变形确实存在显著的空间效应,受空间效应影响,基坑同一深度处端部桩体水平位移远小于中部桩体水平位移值,随着距基坑端部距离增大,空间效应作用逐渐减弱,桩体水平位移逐渐增大,到达某一位置处桩体水平位移不再继续增大,对于不同基坑、同一位置处空间效应系数也有所不同。

In terms of the settlement effect of newly built side slopes of the foundation pit on the balcony,the geotechnical engineering problems in the excavation and design of the foundation pit are analyzed on the basis of its engineering geology,and the excavation of the foundation pit is simulated.The results of the simulation show that the deformation of the envelope structure certainly has significant space effects.Affected by such space effects,the horizontal displacement of piles at the end of the foundation pit at the same depth is much less than that of piles in the middle part.As the distance from the end of the foundation pit increases,the space effects gradually weaken,and the horizontal displacement of piles gradually increases and it stops when reaching a certain position.For different foundation pits,the coefficient of space effects at the same position is also different.