Comparison of the classical and fracture mechanics approaches to determine in situ stress/hydrofracturing method

Mohamadi, Amir; Behnia, Mahmoud; Alneasan, Mahmoud

doi:10.1007/s10064-021-02184-8

Cited by 10 publications

(2 citation statements)

References 42 publications

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“…Zhou and Xia [28] conducted Brazilian splitting tests on fractured as well as fracturefree rock samples, analyzed the crack propagation law based on the phase-field model of quasistatic fractures, investigated the effect of crack dip angle on prefabricated fractured Brazilian disc samples, and analyzed the effects of crack length and critical energy release rate on crack propagation. In recent years, owing to the rapid development of computer technologies, which has resulted in computers that can repeatedly process complex rock computational problems in a fast and efficient manner, various analysis tools have continuously emerged that have been applied in the research of rock fracture mechanics; these include FEM [29][30], BEM [31][32], DDM [33][34],…”

Section: Introductionmentioning

confidence: 99%

Prediction of rock tensile-shear fracture propagation and crack interaction

Li,

Qin

et al. 2023

Preprint

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The interaction and influence between various rock cracks (unequal and noncolinear) are the root cause of fracture in natural rock bodies. In this study, to analyze the interaction law of such cracks, elastic mechanics and the principle of distributed dislocation were superimposed to calculate the mechanical parameters and expressions of the tip stress intensity factor (SIF) and equivalent SIF of two tensile-shear cracks subjected to far-field force. The effects of secondary crack characteristics on the interactions of SIFs at the main crack tip were theoretically analyzed. Then, a secondary crack inclination angle prediction model was established based on the PSO-LSTM theory. The calculated SIF was found to be consistent with the results of the classical Kachanov method and SIF handbook, which further verified the correctness of the derived expression. The results of this study can provide theoretical guidance for evaluating the stability of underground rock excavation projects.

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Section: Introductionmentioning

confidence: 99%

Prediction of rock tensile-shear fracture propagation and crack interaction

Li,

Qin

et al. 2023

Preprint

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“…Stress field inversion involves using mathematical and mechanical methods to infer and extrapolate the distribution of in situ stress in a target area based on stress measurements at individual discrete points on-site. Common methods for measuring discrete point stresses include the borehole stress relief method [3][4][5], hydraulic fracturing [6][7][8], and Kaiser effect [9,10]. However, due to cost constraints, underground space limitations, and repeated damage to tunnel surrounding rock, these methods are difficult to apply directly to measurement of the stress in tunnels or deep-level excavations.…”

Section: Introductionmentioning

confidence: 99%

The Inversion Method Applied to the Stress Field around a Deeply Buried Tunnel Based on Surface Strain

Yan,

Hao,

Yang

et al. 2023

Applied Sciences

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To identify the magnitude and direction of in situ stress in deeply buried tunnels, an inversion method for the stress field was proposed based on a finite number of measurement points of surface strain. Firstly, elastic strain data of finite points on the surface of tunnel surrounding rock were acquired using the borehole stress relief method at the engineering site. Secondly, a finite element model of the tunnel surrounding rock with plastic damage was established, and the parameters of the finite element model were substituted using the SIGINI subroutine. Then, an improved Surrogate Model Accelerated Random Search (SMARS) was developed using genetic algorithm programming on the MATLAB™ platform to invert and attain the globally optimal boundary conditions. Finally, the obtained optimal boundary conditions were applied to the numerical model to calculate the stress distribution in the engineering site. The reliability of this method was validated through a three-dimensional example. The method has been successfully applied to the stress-field analysis of deep tunnels in Macheng Iron Mine, Hebei Province, China. The research results show that this method is a low-cost, reliable approach for stress-field inversion in the rock around a tunnel.

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