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Will a pre-structure concept be applicable to tunnels in squeezing ground?

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Title: Will a pre-structure concept be applicable to tunnels in squeezing ground?
Authors: Yuan, Yong1,2 (AUTHOR), Shi, Bo-Ran1 (AUTHOR), He, Yun-Lu3 (AUTHOR), Feng, Peng4 (AUTHOR), Zhang, Jiao-Long1,2 (AUTHOR) Jiaolong_Zhang@tongji.edu.cn
Source: Tunneling & Underground Space Technology. Oct2025, Vol. 164, pN.PAG-N.PAG. 1p.
Subjects: Young's modulus, Structural analysis (Engineering), Internal friction, Rock concerts, Analytical solutions, Rock deformation
Abstract: Tunneling in squeezing ground is very challenging, due to the difficulty in controlling the large deformation of surrounding rock mass. This renders scholars indulge in developing yield-support theories and structures. In this paper, a novel concept of pre-structuralized method is proposed. It is characterized by installing pre-structure prior to excavation. In order to assess the value of this concept, computational analyses are performed. the CVISC viscoelastic plastic model is adopted to describe the time-dependent behavior of squeezing rock surrounding tunnels. It consists of the Burgers model and the M−C plastic body in series. The radial displacement of the squeezing rock is divided into instantaneous elastic–plastic and viscoelastic displacement. On this basis, the analytical solutions for the plastic and viscoelastic radial displacements are derived, respectively. Then the obtained solutions are superimposed, resulting the complete close-form solutions for the displacements of the surrounding rock mass. The reliability of the derived solutions is demonstrated by comparing the results obtained from numerical simulations based on FLAC3D and the close-form solutions. Parametric studies of the derived solutions with emphasis on the long-term deformation of surrounding rock show that the three most critical parameters are internal friction angle, cohesion, and Young's modulus of rock. This indicates that a concept of pre-structure is valuable because it has much higher values of the above three parameters than those of the rock mass. Followed numerical solutions provide evidence that such a concept is beneficial in terms of reducing the deformation of surrounding rock in squeezing rock. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Tunneling in squeezing ground is very challenging, due to the difficulty in controlling the large deformation of surrounding rock mass. This renders scholars indulge in developing yield-support theories and structures. In this paper, a novel concept of pre-structuralized method is proposed. It is characterized by installing pre-structure prior to excavation. In order to assess the value of this concept, computational analyses are performed. the CVISC viscoelastic plastic model is adopted to describe the time-dependent behavior of squeezing rock surrounding tunnels. It consists of the Burgers model and the M−C plastic body in series. The radial displacement of the squeezing rock is divided into instantaneous elastic–plastic and viscoelastic displacement. On this basis, the analytical solutions for the plastic and viscoelastic radial displacements are derived, respectively. Then the obtained solutions are superimposed, resulting the complete close-form solutions for the displacements of the surrounding rock mass. The reliability of the derived solutions is demonstrated by comparing the results obtained from numerical simulations based on FLAC3D and the close-form solutions. Parametric studies of the derived solutions with emphasis on the long-term deformation of surrounding rock show that the three most critical parameters are internal friction angle, cohesion, and Young's modulus of rock. This indicates that a concept of pre-structure is valuable because it has much higher values of the above three parameters than those of the rock mass. Followed numerical solutions provide evidence that such a concept is beneficial in terms of reducing the deformation of surrounding rock in squeezing rock. [ABSTRACT FROM AUTHOR]
ISSN:08867798
DOI:10.1016/j.tust.2025.106832