Open Access

ARTICLE

A Hybrid Regional Model for Predicting Ground Deformation Induced by Large-Section Tunnel Excavation

Shengjun Deng^1,2,3,*, Yang He¹, Xiaonan Gong², Jiajin Zhou², Xiangdong Hu⁴
1 Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing, 210009, China
2 Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, 310058, China
3 Department of Civil and Environmental Engineering, Princeton University, Princeton, 08544, USA
4 Key Laboratory of Geotechnical and Engineering of Ministry of Education, Department of Geotechnical Engineering, Tongji University, Shanghai, 200092, China
* Corresponding Author: Shengjun Deng. Email:
(This article belongs to this Special Issue: Mechanical Reliability of Advanced Materials and Structures for Harsh Applications)

Computer Modeling in Engineering & Sciences 2023, 134(1), 495-516. https://doi.org/10.32604/cmes.2022.020386

Received 20 November 2021; Accepted 17 February 2022; Issue published 24 August 2022

Abstract

Due to the large number of finite element mesh generated, it is difficult to use full-scale model to simulate largesection underground engineering, especially considering the coupling effect. A regional model is attempted to achieve this simulation. A variable boundary condition method for hybrid regional model is proposed to realize the numerical simulation of large-section tunnel construction. Accordingly, the balance of initial ground stress under asymmetric boundary conditions achieves by applying boundary conditions step by step with secondary development of Dynaflow scripts, which is the key issue of variable boundary condition method implementation. In this paper, Gongbei tunnel based on hybrid regional model involving multi-field coupling is simulated. Meanwhile, the variable boundary condition method for regional model is verified against model initialization and the ground deformation due to tunnel excavation is predicted via the proposed hybrid regional model. Compared with the monitoring data of actual engineering, the results indicated that the hybrid regional model has a good prediction effect.

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Keywords

Freeze-sealing pipe roof method; frozen soil; tunnel; regional model; dynaflow

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