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深基坑上跨運營盾構隧道 MJS 加固方案優化分析

Optimization Analysis of MJS Reinforcement Scheme for Cross Operation Shield Tunnel on Deep Foundation Pit

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陳俊馳¹ , 劉波¹ , 周博聞^{2 , 3}, 湯立峰^{2 , 3}

( 1 . 中電建重慶勘測設計研究院有限公司，重慶 401329 ; 2. 湖南省交通規劃勘察設計院有限公司，

長沙 410000 ; 3 . 湖南省軌道勘察設計有限公司，長沙 410000)

摘要：為確定深基坑上跨盾構隧道施工時隧道的隆起及水平變形規律，以某深基坑上跨區間隧道工程為研究對象，采用有限元分析方法，研究了不同基底加固面積、加固深度、加固方式時隧道的變形規律，并與隧道實測變形結果對比驗證了有限元模型的合理性。結果表明：淤泥質地層中采用 MJS 基底加固方法可有效控制隧道的隆起及水平變形，減小隧道截面的相對變形；隧道隆起變形隨基底加固面積增加而減小，應采取全封底加固措施控制隧道結構變形；隨基底加固深度增加隧道隆起變形減小，基底加固深度超過一定限值后，增加加固深度對減小隆起變形效果減弱；隧道兩側地層加固與基底加固形成的門式加固體系控制隧道結構變形優勢顯著，隧道水平變形、隆起變形隨兩側加固寬度增加而減小，兩側最佳加固寬度為 2 m。研究成果可為類似工程提供參考。

關鍵詞：基坑；區間隧道；MJS 工法；數值分析；變形；加固方案

中圖分類號：U231

文獻標志碼：A

文章編號： 1005- 8249 (2025) 02- 0060- 08

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .02.011

CHEN Junchi ¹ , LIU Bo¹ , ZHOU Bowen^2 , 3 , TANG Lifeng^2 , 3

(1 . China Power Construction Chongqing Survey , Design and Research Institute Co . , Ltd. , Chongqing 401329 ,

China; 2. Hunan Provincial Communications Planning , Survey & Design Institute Co . , Ltd . ,

Changsha 410000 , China; 3 . Hunan Rail Survey and Design Co . , Ltd . , Changsha 410000 , China)

Abstract：In order to determine the vertical uplift and horizontal deformation laws of a shield tunnel construction on a deep foundation pit, a cross section tunnel project on a deep foundation pit was taken as the research object. The finite element analysis method was used to study the deformation laws of the tunnel under different base reinforcement areas, reinforcement depths, and reinforcement methods. The rationality of the finite element model was verified by comparing it with the measured deformation results of the tunnel. The results indicate that the use of MJS foundation reinforcement method in silty strata can effectively control the vertical uplift and horizontal deformation of tunnels, and reduce the relative deformation of tunnel sections; The vertical uplift deformation of the tunnel decreases with the increase of the base reinforcement area, and the decrease in uplift deformation increases with the increase of the base reinforcement area. To control the deformation of the tunnel structure, full bottom sealing reinforcement measures should be taken; As the depth of foundation reinforcement increases, the vertical uplift deformation of the tunnel decreases. After the depth of foundation reinforcement exceeds a certain limit, increasing the reinforcement depth weakens the effect of reducing uplift deformation; The portal reinforcement system formed by the reinforcement of the strata on both sides of the tunnel and the reinforcement of the foundation has significant advantages in controlling the deformation of the tunnel structure. The horizontal deformation and vertical uplift deformation of the tunnel decrease with the increase of the reinforcement width on both sides, and the optimal reinforcement width on both sides is 2m. The research results can be used as a reference for similar projects.

Key words: pit; running tunnel; MJS construction method; numerical analysis; deformation; reinforcement plan

基金項目：湖南高新技術產業科技創新引領計劃(2022GK4033) 。

作者簡介：陳俊馳 (1990—) , 男，本科，高級工程師，研究方向：軌道交通地下結構。

通信作者：周博聞 (1990—) , 男，碩士，高級工程師，研究方向：城市軌道交通工程技術。

收稿日期：2024 - 10 - 21