摘要
以武汉市轨道交通29号线某地铁车站深基坑开挖过程为研究对象,在对其工程地质和水文地质资料进行初步分析的基础上,开展了该基坑的自动化位移变形监测和有限元数值模拟分析,得出如下结论:(1)在基坑开挖深度5 m范围内,整体位移量较小;开挖深度超过在5~15 m范围内,基坑水平位移逐步增大,其中最大位移为19.22 mm,位移最大值位于深度12.3 m(2H/3,H代表基坑深度)位置;当开挖深度超过15 m后,随着深度的增加基坑的水平位移开始逐渐减小,围护结构的水平位移曲线均呈"弓"字型发展;(2)基坑地表沉降的最大值发生在距离基坑边缘H/2位置,最大沉降为6.65~9.15 mm,为开挖深度的0.04%~0.05%。从监测成果来看,基坑周边土体的沉降值均在可控范围内,说明所采取的基坑支护措施是基本合理的。
It is critically important in metro deep excavation to continuously monitor the deformation and its progressive development.This paper presents the numerical evaluation results of a metro station deep excavation of Transit No.29 Line in Wuhan.The numerical analysis model was established based on the site geological and hydrological properties and the analytical deformation results were compared with the monitored results during the construction.The following results can be obtained:1)when the excavation is within 5 meters,small values of deformation are observed.When the excavation depth is between 5 m and 15 m,the observed lateral deflection is gradually increase with a maximum lateral deflection of 19.22 mm.The maximum lateral deflection is at a depth of 12.3 me below the ground(or 2/3 H,H is the depth of excavation).After the maximum lateral deflection,the observed deformation decreases with depth to the ground surface 2)the maximum ground subsidence occurs at a distance of 1/2 Hto the edge of excavation,the ground settlement is between 6.65 and 9.15 mm,which is correspondent to a range of 0.04% to 0.05% of the excavation depth.From the construction monitoring results,both the lateral deflections observed at the excavation supporting structure and the settlement at the ground surface are satisfactory and meet the code requirement.
作者
刘厚成
郭启军
LIU Houcheng;GUO Qijun(Wuhan Zhongke Kechuang Engineering Testing Co.Ltd.,Wuhan 430071;Institute of Rock Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071)
出处
《土工基础》
2021年第1期72-75,共4页
Soil Engineering and Foundation
关键词
ABAQUS
基坑
位移
沉降
ABAQUS
deep excavation
displacement
settlement
