深基坑边塔吊地基加固设计及变形控制分析

随着城市建设地下空间开发需要,深基坑支护工程日益增多.深基坑开挖卸荷作用会引起岩土体应力应变效应,进而诱发周围建(构)筑物地基产生变形.某建筑工程由于施工场地限制,不得不将塔吊基础布置于深基坑围护结构边缘,而塔吊结构的运转荷载会对基坑安全造成隐患,故在基坑开挖前需要对塔吊地基进行加固设计,并对施工过程中塔吊地基变形进行...

Reinforcement Design and Deformation Control Analysis of Tower Crane Foundation beside Deep Foundation Pit

With the development of underground space in urban construction, the number of deep foundation pit supporting projects is increasing. During the excavation of deep foundation pit, the unloading would cause the stress-strain effect of rock and soil, and then induce the deformation of surrounding buildings foundation. Due to the limitation of construction site, the foundation of tower crane has to be placed on the edge of deep foundation pit retaining structure. The operation load of tower crane structure will cause hidden danger to the safety of foundation pit. Therefore, before the foundation pit excavation, it is necessary to reinforce the tower crane foundation and predict the deformation characteristics of the tower crane foundation during the construction process. First of all, based on the conditions of engineering geology and construction environment, this project has designed the anchor pulling pile support scheme to reinforce the tower crane foundation and foundation pit retaining structure. Then, the finite element model of the whole process of foundation pit excavation was established through Midas GTX NX software, and the deformation characteristics before and after the reinforcement of tower crane foundation were simulated. Finally, the numerical simulation results were compared with the field monitoring data in the excavation process to evaluate the reliability of the tower crane foundation reinforcement design scheme. The study shows that the reinforcement design of this project has a good effect on the deformation control of the tower crane foundation. The study results will provide reference for similar deep foundation pit support design and construction.