Analysis of fracture propagation in a rock mass surrounding a tunnel under high internal pressure by the element-free Galerkin method

Tunsakul, Jukkrawut; Jongpradist, Pornkasem; Soparat, Preecha; Kongkitkul, Warat; Nanakorn, Pruettha

doi:10.1016/j.compgeo.2013.08.003

Cited by 26 publications

(11 citation statements)

References 24 publications

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“…10. According to previous studies, the damage distribution depends on the coefficient of lateral rock pressure (k 0 ) (Tunsakul et al, 2014;Karami et al, 2019). When the coefficient of lateral rock pressure k 0 <1, cracks occur in the crown and the invert of the tunnel, and, for k 0 ≥1, they happen at the sidewalls of the RCT.…”

Section: Failure Modesmentioning

confidence: 99%

Surrogate models for the prediction of damage in reinforced concrete tunnels under internal water pressure

Bigdeli

Shishegaran

Naghsh

et al. 2021

J. Zhejiang Univ. Sci. A

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In the present study, the performance of reinforced concrete tunnel (RCT) under internal water pressure is evaluated by using nonlinear finite element analysis and surrogate models. Several parameters, including the compressive and tensile strength of concrete, the size of the longitudinal reinforcement bar, the transverse bar diameter, and the internal water pressure, are considered as the input variables. Based on the levels of variables, 36 mix designs are selected by the Taguchi method, and 12 mix designs are proposed in this study. Carbon fiber reinforced concrete (CFRC) or glass fiber reinforced concrete (GFRC) is considered for simulating these 12 samples. Principal component regression (PCR), Multi Ln equation regression (MLnER), and gene expression programming (GEP) are employed for predicting the percentage of damaged surfaces (PDS) of the RCT, the effective tensile plastic strain (ETPS), the maximum deflection of the RCT, and the deflection of crown of RCT. The error terms and statistical parameters, including the maximum positive and negative errors, mean absolute percentage error (MAPE), root mean square error (RMSE), coefficient of determination, and normalized square error (NMSE), are utilized to evaluate the accuracy of the models. Based on the results, GEP performs better than other models in predicting the outputs. The results show that the internal water pressure and the mechanical properties of concrete have the most effect on the damage and deflection of the RCT.

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Section: Failure Modesmentioning

confidence: 99%

Surrogate models for the prediction of damage in reinforced concrete tunnels under internal water pressure

Bigdeli

Shishegaran

Naghsh

et al. 2021

J. Zhejiang Univ. Sci. A

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“…In these models, they do not consider the initial stress state of the surrounding ground before excavation and operation, which can lead to unrealistic evaluation. In the last decade, many researchers have performed analyses to suggest a reasonable uplift failure pattern [7][8][9][10][11][12]. According to their study, the initial failure point along the cavern periphery depends on the in-situ stress ratio that can lead to different uplift failure patterns [2,9].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Failure Initiation and Modes of Failure of the Hoek-Brown Rock Mass Surrounding Underground Storage With High Internal Pressure

Thongraksa¹

2022

GEOMATE

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The critical issue for the design of highly pressurized caverns is the uplift failure. A reasonable evaluation of the failure path including the initial failure location and direction of the crack propagation is needed. A series of numerical analyses based on the finite element method was conducted in the framework of the 2D axisymmetric model by considering the variety of rock mass properties, cavern depth, and in-situ stress ratio. The wide range of the natural rock mass properties (rock strength) and initial stress conditions surrounding the cavern, which include in-situ stress ratio and depth of tunnel were considered in this investigation. To detect the location of failure initiation and distinguish the failure modes between tensile and shear failure, the tensile failure and Hoek-Brown failure criteria are utilized, respectively. The numerical results indicated that the rock strength has a strong effect on the initial failure mode while the initial failure location strongly depends on the in-situ stress ratio and rock strength. The charts of failure mode and initial failure location were created by using the relationship between unconfined compressive strength and tensile strength of rock mass and initial stress condition, respectively

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“…Perazzelli et al showed by means of small‐ and large‐strain numerical analyses (assuming the same rock model of Brandshaug et al) that the deformations at failure are very large for weak rock masses and necessitate a geometrically nonlinear formulation to obtain the ultimate uplift pressure; the small strain approach may—depending on the stiffness of the rock mass—overestimate the ultimate pressure. Tunsakul et al developed a numerical method based on the element‐free Galerkin method with a cohesive crack model to simulate fracture propagation patterns in a continuum medium around a pressurized tunnel. Their numerical results agree qualitatively with observations in physical model tests and show that the in situ stress ratio has a strong influence both on the position of crack initiation and on the propagation direction.…”

Section: Introductionmentioning

confidence: 99%

Upper bound limit analysis of uplift failure in pressurized sealed rock tunnels

Perazzelli

Anagnostou

2017

Num Anal Meth Geomechanics

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The rock around tunnels used for gas storage is subject to high pressures, reaching 30 MPa in the case of compressed air energy storage. Uplift failure of the overlaying rock mass up to the surface represents the main hazard scenario in such cases. The present paper investigates this problem by using the upper bound theorem of limit analysis assuming a continuum rock mass model obeying the Mohr Coulomb failure criterion with tension cut-off. Tools of the calculus of variations are used to assess the geometry of the failure surface. The effects of geometrical and geotechnical parameters on uplift pressure are analyzed systematically. Charts are then provided, which enable a quick estimation of the upper bound of uplift pressure across a wide range of geotechnical and geometrical conditions.

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Analysis of fracture propagation in a rock mass surrounding a tunnel under high internal pressure by the element-free Galerkin method

Cited by 26 publications

References 24 publications

Surrogate models for the prediction of damage in reinforced concrete tunnels under internal water pressure

Surrogate models for the prediction of damage in reinforced concrete tunnels under internal water pressure

Evaluation of the Failure Initiation and Modes of Failure of the Hoek-Brown Rock Mass Surrounding Underground Storage With High Internal Pressure

Upper bound limit analysis of uplift failure in pressurized sealed rock tunnels

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