Three-dimensional forward analysis and real-time design of deep tunneling based on digital in-situ testing

Cai, Wuqiang; Zhu, Hehua; Liang, Wenhao; Vu, BaThao; Su, Chenlong; Zhang, Keshen; Wang, Xiaojun

doi:10.1016/j.ijmecsci.2022.107385

Cited by 22 publications

(3 citation statements)

References 61 publications

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“…Some other researchers also noted that the rock mass strength depends entirely on the intermediate principal stress, which acts as the confning stress [18,22]. Tese also refect the problem of conservativeness of tunnel design based on the two-dimensional theory [23]. Terefore, a strength criterion with a nonlinear strength envelope is indispensable for accurate descriptions of rock mechanical behaviors.…”

Section: Introductionmentioning

confidence: 99%

A Simple Solution and Dilatancy Characterization for a Circular Tunnel Excavated in the Nonlinear Strain-Softening and Nonlinear Dilatancy Rock Mass

Wang

2023

Advances in Civil Engineering

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Tunnel opening or excavation in the strain-softening rock masses primarily leads to initial stress release and rock deformation. The increasing plastic shear strain induces a nonlinear variation of dilatancy in rock masses. Therefore, tunnel stability is strongly dependent on the stress state and the strain-softening and dilatancy behaviors of rock masses. In view of this, this paper proposes an elastoplastic finite difference solution based on the triple-shear element (TS) unified strength criterion (USC) and the nonassociative flow law; thereafter, some typical examples are referred to verify its validity. This solution allows for the description of the intermediate principal stress effect, the nonlinear strain-softening and dilatancy behaviors of the rock mass. Parametric analysis finally determines the influence characteristics of the intermediate principal stress effect (b), the critical softening parameter ( η ∗ ), softening factor (δ), and support force (pi) on the dilation angle (ψ) of the rock mass in the plastic zone. The findings confirm that the intermediate principal stress mainly affects peak values of ψ, which increases as b grows. The rate of change of ψ mainly depends on η ∗ , which tends to be slower with increasing η ∗ . The variation pattern of ψ in the residual zone under different δ is generally consistent, while the variability of ψ in the softening zone is significant. For a given intermediate principal stress state and strain-softening behavior of the rock mass, the values and the developed form of ψ in the plastic zone is independent of pi.

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Section: Introductionmentioning

confidence: 99%

A Simple Solution and Dilatancy Characterization for a Circular Tunnel Excavated in the Nonlinear Strain-Softening and Nonlinear Dilatancy Rock Mass

Wang

2023

Advances in Civil Engineering

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“…Furthermore, the long-term creep and water efects on rock tunnel lining can be back-analyzed based on deformation [28]. It is noted that most of the existing back-analyzed parameters are generalized, heavily dependent on the selected theoretical models, and afected by limited or incomplete monitoring data [29][30][31]. As for the back analysis of external loads, full-ring load distribution is not taken into consideration in related research currently [18,[32][33][34].…”

Section: Introductionmentioning

confidence: 99%

A Novel Back-Analysis Approach for the External Loads on Shield Tunnel Lining in Service Based on Monitored Deformation

Lin

Xie

et al. 2023

Structural Control and Health Monitoring

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The maintenance of in-service shield tunnel lining has become a critical issue in recent decades due to the rapid development of the metro system in China. The external load is one of the most important factors influencing the deformation and performance of the in-service shield tunnels. It is hard to evaluate the external load since it is influenced by complex factors. And the arbitrary-distributed external load is not considered in the existing theories. A novel back-analysis approach for evaluating the external load using the deformation of tunnel lining was proposed based on Betti’s theorem. The theoretical rationality of the proposed method is analyzed, and the workflow is provided. The data and simulation models for a model test were adopted to validate the effectiveness and accuracy of the proposed method. The results show that the external loads can be back-analyzed with satisfying accuracy and low computational cost. Then, the practical application was conducted for an in-service shield tunnel. In addition, the workflow combined with laser scanning and back analysis was proposed for evaluating the practical loads. The proposed approach can be used for the back analysis of the external loads based on lining deformation scanned inside tunnels, with good performance.

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“…Among the aforementioned pioneering studies, it is fully recognized that the shear stress/shear displacement curve of the rock sample subjected to shear tests can be divided by peak points into two critical stages, the pre-peak stage and post-peak stage. Because the shear test requires specific test conditions, the test results themselves have a certain discreteness [37]. In practice, it is difficult to select the most suitable test results to evaluate the shear constitutive relationship [38], and the shear stress/shear displacement curve is essential to describe the shear fracture characteristics of rock joints [39].…”

Section: Introductionmentioning

confidence: 99%

A New Shear Constitutive Model Characterized by the Pre-Peak Nonlinear Stage

et al. 2022

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The pre-peak shear stress-displacement curve is an important part of the study of the shear mechanical behavior of rock joints. Underpinned by the Haldane distribution, a new semi-analytical model for the pre-peak shear deformation of rock joints was established in this paper, the validity of which was verified by laboratory and in situ experimental data. Other existing models were employed to make comparisons. The comparison results show that the model has superior adaptability and is more suitable for convex-type shear constitutive curves than existing models. Besides, only one parameter was introduced to the model, which is more convenient for application. All of these imply that the proposed model is an effective tool to evaluate the pre-peak shear constitutive curves of different rock joints. The research results can provide a reference for further understanding of the shear fracture characteristics of rock materials.

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Three-dimensional forward analysis and real-time design of deep tunneling based on digital in-situ testing

Cited by 22 publications

References 61 publications

A Simple Solution and Dilatancy Characterization for a Circular Tunnel Excavated in the Nonlinear Strain-Softening and Nonlinear Dilatancy Rock Mass

A Simple Solution and Dilatancy Characterization for a Circular Tunnel Excavated in the Nonlinear Strain-Softening and Nonlinear Dilatancy Rock Mass

A Novel Back-Analysis Approach for the External Loads on Shield Tunnel Lining in Service Based on Monitored Deformation

A New Shear Constitutive Model Characterized by the Pre-Peak Nonlinear Stage

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