Investigation of hydraulic fracture growth near a mine opening

Azarov, A. V.; Patutin, A. V.

doi:10.1088/1755-1315/773/1/012003

Cited by 3 publications

(4 citation statements)

References 6 publications

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“…Radial and circumferential cracks are produced in slotted charge blasting rocks [4] , and shbone shapes, river shapes and other uneven morphological characteristics are present on the fracture surfaces of the cracks. There are no branch cracks or collapse pits in the slotted charge blasting rock samples.…”

Section: Discussion Of Macroscopic Characteristicsmentioning

confidence: 99%

“…In addition, the thermal effect promotes the uniform growth of multiple fractures. Azarov AV et al(2021) has investigated the behavior of a hydraulic fracture near the mine opening in a plane-parallel formulation. It is found that the fracture path is greatly in uenced by the ratio of hydrostatic pressure and critical tensile stress of rock.…”

Section: Introductionmentioning

confidence: 99%

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Micro analysis of rock fracturing under the impact of high-temperature and high-pressure fluid

Pang,

Hu,

Yan

et al. 2023

Preprint

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To reveal the mechanism of high-temperature and high-pressure fluid thermal shock rock breakage and the formation mechanism of microcracks, this paper carried out an experimental study of supercritical (SC)-CO2 thermal shock rock breakage by using a self-developed hard rock true triaxial aerodynamic pulse fracturing experimental system and studied the micro-characteristics of different kinds of cracks after high-temperature and high-pressure fluid impact cracking by scanning electron microscopy. This study discovered three main actions in the process of rock breaking by SC-CO2 thermal shock. 1) The stress wave generated by thermal shock forms radial tensile stress and radial cracks during stress wave propagation and circumferential tensile stress and circumferential cracks during unloading. At the same time, spherical particles appear on the fracture surfaces of radial cracks and circumferential cracks; these particles are features of vertical and horizontal gullies. 2) The splitting action of high-temperature and high-pressure fluid further expands radial and circumferential cracks and promotes the generation of shear cracks (branch cracks). The fracture surfaces of branch cracks appear flat and smooth and have bedded and river shapes. 3) Collapse pits are formed by scouring. Although the collapse pits have different shapes and depths, all the pits are flat and smooth. The research results are significant for revealing the rock breaking mechanism of SC-CO2 thermal shock and play an important role in quantitatively controlling directional pre-cracking, hole layout parameter design, and crack type, size and complexity.

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Section: Discussion Of Macroscopic Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Micro analysis of rock fracturing under the impact of high-temperature and high-pressure fluid

Pang,

Hu,

Yan

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…In this case, the results of modeling the hydraulic fracturing correspond to the solutions obtained in the elastic model. Some aspects of such a problem already have been studied [35,37,50]. Figure 3 shows the paths of the hydraulic fractures at different hydrostatic stresses, P, and different distances between the initial crack and the cavity.…”

Section: Uncoupled Problemmentioning

confidence: 99%

“…The behavior of a hydraulic fracture near a mine in a plane-parallel formulation was investigated in [37]. It was shown that, when the hydrostatic pressure increases with respect to critical tensile stress, the fracture begins to deviate from the mine opening earlier and does not reach its surface.…”

mentioning

confidence: 99%

Hydraulic Fracture Propagation Near the Cavity in a Poroelastic Media

2021

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In this paper, we investigate the problem of the propagation of hydraulic fractures in a poroelastic medium that has a circular cavity. The research was conducted using the extended finite element method (XFEM) implemented in the ABAQUS software package. The problem was considered in a plane formulation. The initial crack was oriented parallel to the surface of the cavity. It was shown that the path of the hydraulic fracture depends strongly on the hydrostatic stress in the medium and the distance between the crack and the cavity. We studied the influences of the poroelastic parameters, such as permeability and the Biot coefficient, on the propagation of cracks. It was shown that the cracks were less curved when the coupled problem of poroelasticity was considered. The features of fluid pressure changes inside the fracture and at the opening of the mouth were studied. It was shown that the fluid pressure in the fracture during injection was minimally sensitive to the state of the stress in the medium, to the position of the initial crack, and to the poroelastic parameters. The solution to the problem in this setting can be used to simulate hydraulic fracturing close to mine workings during a controlled roof’s collapse to prevent it from hanging, and the formation of impervious screens to reduce airflow from the mine to degassing boreholes through the rock, for example.

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Study on the Influence of In Situ Stress Distribution on the Stability of Roadway Surrounding Rock

Gong

2021

Advances in Civil Engineering

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In order to understand the instability characteristics of surrounding rock in the process of deep roadway excavation, a three-dimensional numerical model was established by FLAC3D to systematically analyze the influence of roadway surrounding rock stability under different in situ stress distribution forms, and the environmental coefficient of mining-induced stress η was defined, the larger the environmental coefficient of mining-induced stress is, the larger the surrounding rock stress environment is, and the range where the η coefficient is greater than 0.2 is called with the destruction-danger zone. When the initial vertical stress is maximum principal stress and minimum principal stress, by comparing the roadway along the middle ground stress direction and minimum or maximum in-situ stress direction, the variation characteristics of displacement, failure zone and failure hazard zone of roadway surrounding rock are obtained, which provides theoretical basis for the treatment of disaster accidents such as roadway surrounding rock instability and rock burst caused by deep high in-situ stress.

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Investigation of hydraulic fracture growth near a mine opening

Cited by 3 publications

References 6 publications

Micro analysis of rock fracturing under the impact of high-temperature and high-pressure fluid

Micro analysis of rock fracturing under the impact of high-temperature and high-pressure fluid

Hydraulic Fracture Propagation Near the Cavity in a Poroelastic Media

Study on the Influence of In Situ Stress Distribution on the Stability of Roadway Surrounding Rock

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