Theoretical Back Analysis of Internal Forces of Primary Support in Deep Tunnels

He, Wenzheng; Linsheng, Xu; Wang, Lili

doi:10.25103/jestr.121.03

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…However, this is at the expense of longer preparation of the model and greater demands regarding the comprehensiveness of the input parameters, e.g., capturing the progress of driving. The modelling result indicates the stress-deformation status of the rock mass; the effect of the tunnel's construction on the development of the synclinal valley on the surface, which is important to predict for built-up areas; and the internal forces in the primary lining [24]. The lining cross-section is then assessed by comparing the inner forces with the load-bearing capacity, which is depicted in an interaction diagram according to EC2 [25].…”

Section: State Of the Artmentioning

confidence: 99%

Approach for Optimisation of Tunnel Lining Design

et al. 2020

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This paper presents an approach that enables the specific characteristics of a primary tunnel lining implemented using numerical modelling to be taken into account during its design. According to the fundamental principles of the New Austrian Tunnelling Method, the primary lining undergoes time-dependent deformation, which is determined by its design. The main design element is shotcrete, which, shortly after its application, interacts with the surrounding rock mass and steel arch frame. The primary lining ensures the equilibrium stress–strain state of “rock mass–tunnel lining” during excavation. The structural interaction varies depending on the hardening of the shotcrete, the rheological properties of the rock mass, and other factors. The proposed approach uses the Homogenisation software application, which was developed by the Faculty of Civil Engineering at the Department of Geotechnics and Underground Engineering of the VSB—Technical University of Ostrava. This software allows the heterogeneous structure of the lining to be considered by replacing it with a homogenous structure. The parameters of the homogeneous primary lining, which take into account the steel reinforcement elements and the time-dependent property of the shotcrete, are included in numerical models.

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Section: State Of the Artmentioning

confidence: 99%

Approach for Optimisation of Tunnel Lining Design

et al. 2020

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“…The results of the solution were checked by comparison with those of the published literature. He et al [ 9 ] proposed a back-analysis method to analyze the internal forces of primary support in deep tunnels based on the theory of a circular curved beam, where the input of is the in-situ-measured radial displacement of primary linings and contact stress between shotcrete and surrounding rocks.…”

Section: Introductionmentioning

confidence: 99%

Identification Method for Internal Forces of Segmental Tunnel Linings via the Combination of Laser Scanning and Hybrid Structural Analysis

Zhang

Karlovšek

Liu

2022

Sensors

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This paper provides a new solution to identify the internal forces of segmental tunnel linings by combining laser scanning and hybrid structural analysis. First, a hybrid structural analysis method for quantifying the internal forces based on displacement monitoring is established, which requires comprehensive displacement monitoring with high precision and a complete trace history. Motivated by the development of laser scanning, two remedial solutions are proposed for typically insufficient engineering conditions, i.e., lack of displacement developing process and poor accuracy of measurements, which is highlighted in this paper. Therefore, with the help of remedial solutions, the structural analysis is able to be adopted with the application of laser scanning. The tool for developing remedial solutions is the first-order theory of slender circular arches. Virtual tests, based on a calibrated finite element model, were performed to verify the feasibility of the presented hybrid analysis and remedial solutions. In addition, parametric analyses were conducted to study the error propagation from laser scanning to the results of hybrid analysis. The resolution and measurement noise of laser scanning were investigated and discussed. On this basis, advice on combining laser scanning and hybrid structural analysis is proposed. Finally, on-site application of the hybrid analysis on an actual tunnel is presented and discussed.

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“…e research focuses on the support strategies of high-strength initial support system, multilevel layered support, yieldable support technology, and active support system. At present, the main methods to increase initial support system are as follows: improved concrete strength [3][4][5][6]; encrypted steel arch [7,8]; and new arch structures [9,10]. Multistage layered support mainly includes advance pipe shed support [11,12] and double-layer initial support [13].…”

Section: Introductionmentioning

confidence: 99%

Effects of High‐Pretension Support System on Soft Rock Large Deformation of Perpendicularly Crossing Tunnels

Gan

Zhou

2020

Advances in Civil Engineering

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The control mechanism of prestressed support system is studied by means of three-dimensional discrete element numerical simulation, theoretical analysis, and field measurement. The actual project is selected to analyze, and the control effect is demonstrated. The theoretical analysis results show that the prestressed support can improve the self-bearing capacity of surrounding rock, which is conducive to the stability of the surrounding rock. The numerical calculation shows that, under the control of the long and short cables, the prestress can spread effectively and form two bearing arches. The deformation is difficult to control, which is in the arch crown and the arch shoulder of the tunnel intersection. However, the deformation of the surrounding rock decreases with the increase of prestress. Through the analysis of the measured results, it shows that the pretension support design scheme can effectively control the large deformation of the surrounding rock.

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Theoretical Back Analysis of Internal Forces of Primary Support in Deep Tunnels

Cited by 6 publications

References 15 publications

Approach for Optimisation of Tunnel Lining Design

Approach for Optimisation of Tunnel Lining Design

Identification Method for Internal Forces of Segmental Tunnel Linings via the Combination of Laser Scanning and Hybrid Structural Analysis

Effects of High‐Pretension Support System on Soft Rock Large Deformation of Perpendicularly Crossing Tunnels

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