Modelling fracture of rock masses around tunnels and slopes by field-enriched finite element method

Jia, Zhi-Ming; Zhou, Xiao-Ping

doi:10.1016/j.compgeo.2023.105756

Cited by 5 publications

(2 citation statements)

References 37 publications

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“…Despite successful numerical simulations in the current literature [57][58][59][60], simulation results may deviate significantly from the expected test results due to factors such as the influence of grain size [56,61], the presence of weak planes [62], the existence of voids and initial cracks [63], the geometrical characteristic of the tested specimen [61,64], or even the instruments used to register all relevant data during the UCT [65][66][67]. All these sources of influence increase the complexity of accurately modeling rock behavior, as decisions by researchers should be made regarding the presence and distribution of natural heterogeneities inside the material [68], the contact conditions [57,69], or and even the meshing techniques applied [70][71][72][73]. Therefore, the deeper the understanding of how basic variables influence the standard UCT outputs, the more accurate the derived models and simulations will be.…”

Section: Introductionmentioning

confidence: 99%

Influence of Platen Stiffness on the Contact Stress Distribution in the Standardized Uniaxial Compression Test

Guerrero-Miguel,

Álvarez-Fernández,

Ramírez-Berasategui

et al. 2024

Mathematics

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Uniaxial compressive strength is an essential mechanical parameter to adequately characterize any given material. Numerous standards have been developed to guarantee reliable testing execution, as well as the repeatability of results. In this sense, not only the geometric dimensions and tolerances of both the platen and the specimen have been prescribed, but also the testing parameters, such as the load application speed. However, all these recommendations are based on the assumption that the stresses are uniformly distributed across the contact interface between the platen and the specimen. Nevertheless, this is major elastic simplification that allows for obtaining a handy and useful formula to determine the compressive strength, but this strongly deviates the theoretical foundations from the actual experimental reality. Experimental and numerical research to determine the influence of relative stiffness between the specimen and the platen on the stress distribution generated during the execution of the uniaxial compressive test is performed. The results prove that the stresses are not uniformly distributed across the contact when the platen material is significantly stiffer or softer (less stiff) than that of the tested specimen, and additionally, an undesired triaxial stress field is induced inside the specimen. For these reasons, the use of platens with a similar stiffness to that of the specimen is strongly recommended, as it allows for the uniform distribution of the compressive contact stresses and minimizes the influence of the triaxial stress field.

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Section: Introductionmentioning

confidence: 99%

Influence of Platen Stiffness on the Contact Stress Distribution in the Standardized Uniaxial Compression Test

Guerrero-Miguel,

Álvarez-Fernández,

Ramírez-Berasategui

et al. 2024

Mathematics

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“…Recently, a novel meshbased numerical method, called the field-enriched finite element method (FE-FEM), has been applied to effectively simulate the failure process of materials containing different defects [33][34][35]. It has been proven to show good performance in multiple application scenarios, such as multi-material [36][37][38], multi-dimensional [39], and multi-loading rate [40][41]. Additionally, the FE-FEM also performs well in dealing with the thermo-mechanical coupling problems [42].…”

Section: Introductionmentioning

confidence: 99%

A coupled hydro-mechanical field-enriched finite element method for simulating the hydraulic fracture process of rocks subjected to in-situ stresses

Han,

Zhou

2024

Preprint

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A coupled hydro-mechanical field-enriched finite element method (HM-FE-FEM) is developed for simulating the hydraulic fracture process of rocks subjected to in-situ stresses. The staggered iterative scheme based on the Newton-Raphson iterative algorithm is utilized to address the coupled hydro-mechanical problems. The opening process of the hydraulic fracture and natural fracture subjected to in-situ stresses can be reproduced by the proposed method. The accuracy of the proposed method is verified through stress intensity factor, fracture opening and experiment results. For coalescence patterns between hydraulic and natural fractures, the influences of horizontal stress difference and intersection angle are analyzed and discussed. Additionally, for coalescence patterns between hydraulic fracture and natural karst caves, the influences of cave location, cave radius and horizontal stress difference are investigated and discussed. The numerical results illustrate the effectiveness of HM-FE-FEM in handling the complex coalescence behaviors in the hydraulic fracture process of underground rock reservoirs with different defects. This study has a certain guiding significance for optimizing the fracturing operation parameters.

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Anisotropic stiffness and strength of concrete rock mass equivalent with sets of persistent joints

Hua,

Zhang,

Xiong

et al. 2024

Computers and Geotechnics

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Modelling fracture of rock masses around tunnels and slopes by field-enriched finite element method

Cited by 5 publications

References 37 publications

Influence of Platen Stiffness on the Contact Stress Distribution in the Standardized Uniaxial Compression Test

Influence of Platen Stiffness on the Contact Stress Distribution in the Standardized Uniaxial Compression Test

A coupled hydro-mechanical field-enriched finite element method for simulating the hydraulic fracture process of rocks subjected to in-situ stresses

Anisotropic stiffness and strength of concrete rock mass equivalent with sets of persistent joints

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