3D numerical model for dynamic loading-induced multiple fracture zones around underground cavity faces

Tao, Ming; Li, Xibing; Wu, Chengqing

doi:10.1016/j.compgeo.2013.06.002

Cited by 50 publications

(9 citation statements)

References 25 publications

(17 reference statements)

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“…A single cavity and multiple cavities are simulated by RFPA2D, and the lateral compressive coefficient is calculated [4]. A three-dimensional (3-D) model is built to reveal the crack propagation around cavities [5]. The stability of the hole is calculated by theory and an engineering experiment is carried out to verify the results [6].…”

Section: Introductionmentioning

confidence: 99%

Stress Inversion of Coal with a Gas Drilling Borehole and the Law of Crack Propagation

Zhang

et al. 2017

Energies

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Abstract:For studying the law of crack propagation around a gas drilling borehole, an experimental study about coal with a cavity under uniaxial compression was carried out, with the digital speckle correlation method capturing the images of coal failure. A sequence of coal failure images and the full-field strain of failure were obtained. The strain softening characteristic was shown by the curve. A method of curve dividing-named fitting-damaging-was proposed, combining the least square fitting residual norm and damage fraction. By this method, the five stages and four key points of a stress-strain curve were defined. Then, the full-field stress was inverted by means of the theory of elasticity and the adjacent element weight sharing model. The results show that σ ci was 30.28-41.71 percent of σ f and σ cd was 83.08-87.34 percent of σ f , calculated by the fitting-damaging method, agreeing with former research. The results of stress inversion showed that under a low stress level (0.15 σ f < σ < 0.5 σ f ), microdamage evolving into plastic failure later was formed around the cavity. Under a high stress level (0.5 σ f < σ < 0.85 σ f ), the region of stress concentration suddenly crazed and formed a brittle crack. When σ ≥ 0.85 σ f , the crack was developing, crack lines were connecting with each other, and the coal finally failed. The outcome of the stress inversion was completely concomitant with the images of crack propagation. Additionally, the stress around the cavity was able to be calculated accurately.

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Section: Introductionmentioning

confidence: 99%

Stress Inversion of Coal with a Gas Drilling Borehole and the Law of Crack Propagation

Zhang

et al. 2017

Energies

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“…Then they proposed a numerical method based on the maximum tensile stress criterion and strain energy density theory to simulate the zonal fracture phenomenon. Tao et al (2013) applied a damage formulation to simulate softening and modulus reduction to propose a new method to understand the mechanisms and behaviors of high initial stress rocks. Jia et al (2012) studied the damage evolution around deep underground openings under multiaxial stress through 3D numerical tests.…”

Section: Introductionmentioning

confidence: 99%

Failure Mechanism and Numerical Simulation of Splitting Failure for Deep High Sidewall Cavern Under High Stress

Zhang

Wen

et al. 2021

Geotech Geol Eng

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With the increase of the depth of the underground engineering, the phenomenon of splitting failure of the deep rock will appear, which is very different from the shallow cavern. In order to reveal the formation mechanism of splitting damage, mechanical model tests and numerical simulations of splitting damage were carried out respectively. Using the Pubugou Hydropower Station as the engineering background, a three-dimensional (3D) geomechanical model test was conducted relying on a high stress three-dimensional load test system. The splitting damage phenomenon of high sidewall cavern was observed, and the oscillation variations of displacement and stress were measured. Based on strain gradient theory and continuum damage mechanics, an elastic-plastic damage softening model for splitting damage was established. The relationship between rock damage and energy dissipation was analyzed. Based on the strain energy density theory, the splitting damage criterion based on the strain gradient is established. A numerical analysis method for splitting damage was proposed, and a regional disintegration calculation program was developed based on a commercial finite element code. The numerical simulation results are in basic agreement with the 3D geomechanical model test.

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“…Lu et al [11] also investigated the dynamic response of roadway due to transient release of initial geostress. While the excavation unloading process induces damage to underground cavity, dynamic loading is also a nonignorable cause to induce rock degradation or even failure [12,13]. Zhu et al [12] employed RFPA code to study the dynamic failure process of an underground opening under static geostresses and dynamic loading.…”

Section: Introductionmentioning

confidence: 99%

“…Zhu et al [12] employed RFPA code to study the dynamic failure process of an underground opening under static geostresses and dynamic loading. Tao et al [13] examined the multiple fracture zones around highly stressed cavities, and the results illustrated that the dynamic load and static stress gradient are two critical factors to induce multiple fracture. The previous researches indicated that the fracturing behavior and damage zone of underground roadways are generally different under various geostresses.…”

Section: Introductionmentioning

confidence: 99%

Influence of Geostress Orientation on Fracture Response of Deep Underground Cavity Subjected to Dynamic Loading

Weng¹,

Li²,

Tao³

2015

Shock and Vibration

Self Cite

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Deep underground cavity is often damaged under the combined actions of high excavating-induced local stresses and dynamic loading. The fracturing zone and failure type are much related to the initial geostress state. To investigate the influence of geostress orientation on fracture behaviours of underground cavity due to dynamic loading, implicit to explicit sequential solution method was performed in the numerical code to realize the calculation of geostress initialization and dynamic loading on deep underground cavity. The results indicate that when the geostress orientation is heterotropic to the roadway’s floor face (e.g., 30° or 60°), high stress and strain energy concentration are presented in the corner and the spandrel of the roadway, where V-shaped rock failure occurs with the release of massive energy in a very short time. When the geostress orientation is orthogonal to the roadway (e.g., 0° or 90°), the tangential stress and strain energy distribute symmetrically around the cavity. In this regard, the stored strain energy is released slowly under the dynamic loading, resulting in mainly parallel fracture along the roadway’s profile. Therefore, to minimize the damage extent of the surrounding rock, it is of great concern to design the best excavation location and direction of new-opened roadway based on the measuring data ofin situgeostresses.

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3D numerical model for dynamic loading-induced multiple fracture zones around underground cavity faces

Cited by 50 publications

References 25 publications

Stress Inversion of Coal with a Gas Drilling Borehole and the Law of Crack Propagation

Stress Inversion of Coal with a Gas Drilling Borehole and the Law of Crack Propagation

Failure Mechanism and Numerical Simulation of Splitting Failure for Deep High Sidewall Cavern Under High Stress

Influence of Geostress Orientation on Fracture Response of Deep Underground Cavity Subjected to Dynamic Loading

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