浙江大学学报(工学版)  2021, Vol. 55 Issue (2): 318-329    DOI: 10.3785/j.issn.1008-973X.2021.02.012
 土木工程、交通工程

1. 浙江大学 滨海和城市岩土工程研究中心，浙江 杭州 310058
2. 浙江省城市地下空间开发工程技术研究中心，浙江 杭州 310058
3. 河海大学 岩土工程科学研究所，江苏 南京 210098
4. 中铁十一局集团有限公司，湖北 武汉 430061
5. 杭州地铁集团有限责任公司，浙江 杭州 310020
6. 中天建设集团有限公司，浙江 杭州 310020
Prediction of shield tunnel displacement due to adjacent basement excavation considering continuous deformation of ground
Hong-wei YING1,2,3(),Kang CHNEG1,2,4,Jian-lin YU1,2,*(),Ri-qing XU1,2,Zhi-jian QIU5,Xiao-bo ZHAN6,Jian-she QIN5,Chun-hui LOU1,2
1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
2. Engineering Research Center of Urban Underground Development of Zhejiang Province, Hangzhou 310058, China
3. Institue of Geotechnical Engineering Science, Hohai University, Nanjing 210098, China
4. China Railway 11th Bureau Group Co. Ltd, Wuhan 430061, China
5. Hangzhou Metro Group Co. Ltd, Hangzhou 310020, China
6. Zhongtian Construction Group Co. Ltd, Hangzhou 310008, China
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Abstract:

A simplified vertical additional load calculation model of basement excavation, considering the unloading effect of bottom as well as sidewalls, was established based on the engineering practice. The vertical additional load at adjacent tunnel caused by basement excavation was given based on the Mindlin solution. A simplified calculation method was proposed for the response of tunnel subjected to an adjacent basement excavation, by introducing a modified subgrade reaction coefficient which could consider the arbitrary tunnel buried depth and regarding the existing tunnel as a continuous Euler-Bernoulli beam resting on Pasternak foundation. The proposed method could consider the effect of tunnel buried depth as well as the ground shear effect, closer to the engineering practice. The rationality and the applicability of the proposed method were verified by comparing it with the three-dimensional finite element method, as well as two groups of published engineering measured data. The main parameters such as elastic modulus and shear modulus of ground, the longitudinal equivalent bending stiffness of tunnel, the angle between tunnel and excavation, the embedded depth of the tunnel, the distance between tunnel and excavation as well as the geometric shape of excavation were all systematically studied. Results indicate that the maximum tunnel vertical displacement, when the tunnel was parallel to the excavation, was 1.60 times of that when the tunnel was perpendicular to the excavation. The maximum displacement of the tunnel can be effectively reduced by increasing the longitudinal bending rigidity of the tunnel, but this “reducing effect” will decrease with the increasing distance between the excavation and the tunnel. The maximum displacement of the tunnel exhibits a non-linear decreasing law with the increase of the tunnel buried depth and the distance between tunnel and excavation. The "long excavation" will affect the displacement and the uplift range of the tunnel, while the "short excavation" mainly affects the tunnel displacement. Results could provide some theoretical support for reasonably predicting the response of existing tunnel due to adjacent excavation.

Key words: basement excavation    tunnel vertical displacement    arbitrary depth    shear effect    long excavation    short excavation

 CLC: TU 375.2

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#### 引用本文:

Hong-wei YING,Kang CHNEG,Jian-lin YU,Ri-qing XU,Zhi-jian QIU,Xiao-bo ZHAN,Jian-she QIN,Chun-hui LOU. Prediction of shield tunnel displacement due to adjacent basement excavation considering continuous deformation of ground. Journal of ZheJiang University (Engineering Science), 2021, 55(2): 318-329.

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