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賀   曉 ，鄭會桓

 

（北京京投城市管廊投資有限公司 ，北京 100027)

摘   要 ：為探究管廊深基坑對周圍環境的影響 ，基于 Midas GTS NX 有限元軟件，結合綜合管廊基坑工程實例，建立分步降水開挖和一次性降水開挖工況下的數值模型 ，研究不同工況下基坑降水開挖對周邊環境的影響，對滲流場、基坑周邊地表沉降和既有構筑物的變形進行分析。結果表明：分步降水較一次性降水方式，土層滲流速度明顯下降；基坑周邊地表沉降近似呈“勺形 ”分布，沉降值符合變形要求；既有地鐵隧道靠近基坑一側水平位移和頂部豎向位移較大，且豎向位移總體大于水平位移；分步降水工況下基坑降水開挖對周邊環境影響較一次性降水小，建議在進行基坑降水開挖時，盡量選擇分步降水， 以減少對周邊環境的影響，可對類似工程提供參考。

關鍵詞：基坑降水 ；降水工況 ；滲流場 ；周邊沉降 ；地鐵隧道變形

中圖分類號：TU473            

文獻標志碼：A           

文章編號： 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

作者簡介：賀   曉  (1979—) ,  男 ，本科 ，教授級高級工程師 ，研究方向： 隨公路及軌道交通共建綜合管廊工程技術。

收稿日期：2024 - 12 - 20