Study on rock burst characteristics of coal mine roadway in China

Xu, Lianman; Lu, Kaixuan; Pan, Yishan; Qin, Zhijiao

doi:10.1080/15567036.2019.1655114

Cited by 29 publications

(21 citation statements)

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“…Although the breakage of the bonding unit causes local damage to the interface, the interface can still resist bending moments. Based on this microproperty, the FJM can overcome the three shortcomings of the Bonded-Particle Model [26]: (1) the ratio between σ ci and tensile strength (σ t ) being smaller than the laboratory results, (2) the extremely low Φ, and (3) the linearity of strength envelope. By using FTM, more realistic macromechanical properties of the rock can be constructed.…”

Section: D Local Model: Pfcmentioning

confidence: 99%

“…For the sake of simplicity, only E c , k n /k s , c, and σ c are generally modified during the calibration process [26]. E c is the effective x (2) x (1) (a)…”

Section: Model Calibrationmentioning

confidence: 99%

“…Due to the extensive exploitation of coal, available resources at shallow depth quickly diminish and mining activities below 1000 meters have gradually gained popularity [1]. e mechanical behavior of the rock mass is closely related to the mining method as the mining-induced stress redistribution can significantly influence the surrounding rock mass [2].…”

Section: Introductionmentioning

confidence: 99%

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Fracturing of the Soft Rock Surrounding a Roadway Subjected to Mining at Kouzidong Coal Mine

Xie

Jing

et al. 2020

Advances in Civil Engineering

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The fracture development and distribution around the deep soft rock roadway are pivotal to any underground design. In this paper, both field investigation and numerical simulation were taken to study the fracture evolution and rock deformation of a coal mine roadway at Kouzidong mine, Fuyang, Anhui Province, China. Based on the borehole imaging technique, we found an asymmetric distribution of the fracture zone in the surrounding rock of the roadway. By analyzing the C value of the fractures in the borehole images,we found that the fracture interval distribution of the surrounding rock of the tunnel, the number of fractures will fluctuate decrease with the increase of the depth. To effectively study the fracture propagation and distribution of the roadway under longwall retreatment and roadway excavation, the global-local numerical technique was applied via FLAC3D and PFC2D. In the roadway excavation process, fractures were first formed in the shallow section of the roadway and progressively propagated toward the deeper soft rock layer; the main failure mechanism was a tensile failure. During longwall retreatment, fractures continuously developed toward the deeper soft rock layer. However, the failure mechanism transformed to shear failure. From numerical results, it can be seen that the stress concentration at the ribs was released, which led to shear failure at the roof and floor. Due to the extensive tensile cracks in the shallow section, the surrounding rock experienced expansion and fracture. The deep shear failure also induced the formation of the nonadjacent crushing zone and elastic zone, which is in line with the borehole imaging results.

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Section: D Local Model: Pfcmentioning

confidence: 99%

“…For the sake of simplicity, only E c , k n /k s , c, and σ c are generally modified during the calibration process [26]. E c is the effective x (2) x (1) (a)…”

Section: Model Calibrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fracturing of the Soft Rock Surrounding a Roadway Subjected to Mining at Kouzidong Coal Mine

Xie

Jing

et al. 2020

Advances in Civil Engineering

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“…DRPCGO is currently the most authoritative management and technical legal document on the prevention of coal and gas outburst in China. Moreover, protective seam mining has also been introduced to prevent rock burst in underground coalmine as a China National Standard (GB/T 25217.12-2019)(State administration of market ragulation, 2019; Xu et al, 2019).…”

Section: Detailed Rules On Prevention Of Coal and Gas Outburst (Drpcgmentioning

confidence: 99%

Mathematical equations for pressure relief angle of protective seam inclination in outburst coalmine

Zhang

Liu

Ren

et al. 2020

Preprint

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Protective seam mining is one kind of most effective measure to reduce coal and gas outburst risk. The pressure relief angles along inclination (δm) are key parameters for evaluating the effect of protective seam mining. However, the numerical relation between δm and coal seam dip (a) is defined by discrete data and is difficult to determine δm accurately. In this study, the variations of δm with respect to seam dips are analyzed to derive analytical equations that can be used to accurately calculate δm. The relationship between δm and seam dip (a) can be expressed as parabolic or inverted parabolic curves. Mathematical equations for δm are derived by curve fitting technique. Furthermore, polynomial equations are determined as the most appropriate for δm calculation when the polynomial order is selected as 7, 6, 4 and 5 respectively. These derived equations are computationally solved and verified using actual and field test data of δm. with satisfactory consistency and accuracy. The equations are suggested as supplement and improvement for Detailed Rules on Prevention of Coal and Gas Outburst.

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“…In recent years, the number of roof accidents and single fatalities dominated by rockbursts in China coal mines has been on the rise. It is necessary to adopt the cutting roof pressure relief technology to achieve stress transfer and fundamentally solve the impact of rock pressure caused by the thick and hard roof (Bacha et al, 2020;Swolkien and Szlazak, 2021;Xu et al, 2019;Zhao et al, 2018). Cutting the roof around the working face, such as cutting roadways, mining roadways on both sides, and stop lines can reduce the range and intensity of pressure and prevent large-area roof pressure from causing strong impact on personnel, roadways, and equipment.…”

Section: Introductionmentioning

confidence: 99%

Directional hydraulic fracturing technology for prefabricated longitudinal guide seams in a coal mine tight sandstone roof

Liangwei

2021

Energy Exploration & Exploitation

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Triaxial hydraulic fracturing experiments were used to study the initiation pressure variation and acoustic emission characteristics of different guide seams sizes during roof hydraulic fracturing. Numerical simulations were used to explore the feasibility of multiple boreholes with prefabricated guide seams. An experiment of hydraulic fracturing on a pillar-free working face was also carried out in a coal mine. The results show that the specimens with guide seams reduced the initiation pressure, with the number of acoustic emission events and initiation pressure being inversely proportional to the size of the guide seams. Specimens without guide seams were deflected by stress and produced multi-level cracks, while the specimens with guide seams did not produce large secondary cracks and deflection. When the stress difference was small, three holes penetrated but not under large stress differences. The hydraulic fracturing technology of prefabricated longitudinal guide seams was tested in the Ningtiaota Coal Mine, and the auxiliary transportation roadway of S1201 working face was successfully retained for reuse in adjacent working faces.

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Study on rock burst characteristics of coal mine roadway in China

Cited by 29 publications

References 0 publications

Fracturing of the Soft Rock Surrounding a Roadway Subjected to Mining at Kouzidong Coal Mine

Fracturing of the Soft Rock Surrounding a Roadway Subjected to Mining at Kouzidong Coal Mine

Mathematical equations for pressure relief angle of protective seam inclination in outburst coalmine

Directional hydraulic fracturing technology for prefabricated longitudinal guide seams in a coal mine tight sandstone roof

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