复杂环境下软土深基坑支护变形控制  

Deformation Control of Deep Excavation Support in Soft Soils with Complex Environment

作　　者：高永伟 GAO Yongwei(China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430063)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《土工基础》2023年第6期902-907,共6页Soil Engineering and Foundation

摘　　要：对于软土地区的深基坑工程,当周边的环境条件复杂,尤其是邻近地铁盾构隧道时,控制基坑支护结构的变形非常重要。以杭州软土地区明挖隧道深基坑工程为背景,针对杭州文一西路提升改造项目深基坑工程,采用数值模拟与现场实测数据相结合的方式,对深基坑施工过程的变形控制措施及其效果进行分析。研究结果表明:(1)通过对支护结构预加支撑轴力,可明显减少支护结构水平位移最大值,同时随着预加轴力的增加,对地表沉降也有明显的控制作用。(2)基坑过程中支撑伺服系统控制变形的效果非常显著,可有效控制支护结构的水平变形,减少地表沉降,有利于减小对周围环境的影响。The deformation control in the deep excavation in the soft soils is critical,especially,near the shielded tunnel and other complex environment.Based on the deep excavation project of an open cut tunnel in soft soils in Hangzhou City,this paper presents a case history of Wenyi West Road area.The deformation control measures and results are evaluated by the combination of both numerical analysis and construction monitoring results.The results show that:(1)the maximum horizontal displacement of the support structure can be significantly reduced by preloading the supporting axial force on the support structure.At the same time,with the increase of the preloading axial force,it also has an obvious control effect on the surface settlement.(2)In the process of excavation,the support servo system has a significant effect on the deformation control,which can effectively control the horizontal deformation of the support structure,reduce the surface settlement,and help reduce the impact on the surrounding environment.

关 键 词：深基坑 变形控制 预加轴力 伺服系统 

分 类 号：TU473[建筑科学—结构工程]