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贺   晓 ，郑会桓

 

（北京京投城市管廊投资有限公司 ，北京 100027)

摘   要 ：为探究管廊深基坑对周围环境的影响 ，基于 Midas GTS NX 有限元软件，结合综合管廊基坑工程实例，建立分步降水开挖和一次性降水开挖工况下的数值模型 ，研究不同工况下基坑降水开挖对周边环境的影响，对渗流场、基坑周边地表沉降和既有构筑物的变形进行分析。结果表明：分步降水较一次性降水方式，土层渗流速度明显下降；基坑周边地表沉降近似呈“勺形 ”分布，沉降值符合变形要求；既有地铁隧道靠近基坑一侧水平位移和顶部竖向位移较大，且竖向位移总体大于水平位移；分步降水工况下基坑降水开挖对周边环境影响较一次性降水小，建议在进行基坑降水开挖时，尽量选择分步降水， 以减少对周边环境的影响，可对类似工程提供参考。

关键词：基坑降水 ；降水工况 ；渗流场 ；周边沉降 ；地铁隧道变形

中图分类号：TU473            

文献标志码：A           

文章编号： 1005- 8249   (2025)  02- 0074- 06 

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .02.013

 

HE Xiao ,  ZHENG Huihuan

(Beijing Jingtou Urban Utility Tunnel Investment Co . ,  Ltd . ,  Beijing 100027 ,  China)

Abstract:  To investigate the impact of deep foundation pits for pipe galleries on the surrounding environment,based on the Midas GTS NX finite element program, combined with a comprehensive pipe gallery foundation pit engineering example, the numerical model under the condition of step precipitation excavation and one-time precipitation excavation is established, and the influence of foundation pit precipitation excavation on the surrounding environment under different working conditions is studied, the sewerage field, the surface settlement around the foundation pit and the deformation of the existing subway tunnel are mainly analyzed. The results show that as the precipitation method changes from one - time precipitation to step - by - step precipitation, the seepage velocity of the soil layer shows an obvious downward trend; The ground settlement around the approximate distribution is "spoon", settlement values conform to the requirements of the deformation; Near the existing subway tunnel excavation side top horizontal displacement and vertical settlement deformation, overall is greater than the horizontal displacement and vertical settlement deformation; Under the condition of step-by-step precipitation, the impact of foundation pit precipitation excavation on the surrounding environment is smaller than that of one-time precipitation. it is recommended to choose step-by-step precipitation when conducting foundation pit precipitation excavation, so as to reduce the impact on the surrounding environment.

Keywords: foundation pit precipitation;  precipitation conditions;  seepage field;  peripheral settlement;  deformation of subway tunnels

作者简介：贺   晓  (1979—) ,  男 ，本科 ，教授级高级工程师 ，研究方向： 随公路及轨道交通共建综合管廊工程技术。

收稿日期：2024 - 12 - 20