某深基坑工程围护结构变形规律分析

Retaining structure deformation analysis of certain deep foundation pit engineering

以合肥地铁一号线玉兰大道站基坑工程为研究对象,利用MIDAS/GTS软件建立连续的二维有限元模型,对基坑开挖过程中围护结构变形进行模拟。通过改变围护结构嵌入深度及刚度,讨论不同参数对围护结构变形的影响。结果表明:当不满足稳定性要求时,深层水平位移随着桩体嵌入深度、围护结构刚度的增加而显著减小;当结构趋于稳定时,增大桩体嵌入深度以及围护结构刚度并不能有效减少深层水平位移。

Taking the foundation pit engineering in Yulan Avenue of No. 1 Hefei Metro Line as the research object, using the MIDAS/GTS software to build a continuous two-dimensional finite element model, and the deformation of retaining structure during excavation is simulated. By changing the embedment depth and stiffness of the retaining structure, the influence of different parameters on the deformation of the retaining structure is discussed. The results showed that When the stability requirements are not satisfied, the deep horizontal displacement decreases significantly with the increase of the pile embedment depth and the envelope stiffness. When the structure tends to be stable, re-increasing the embedment depth of the pile and the stiffness of the retaining structure cannot effectively reduce the deep horizontal displacement.