Test of a liquid directional roof-cutting technology for pressure-relief entry retaining mining

Wang, Yajun; Yang, Jun; He, Manchao; Tian, Xichun; Liu, Jianning; Xue, Haojie; Huang, Ruifeng

doi:10.1093/jge/gxz041

Cited by 28 publications

(17 citation statements)

References 26 publications

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“…A no-pillar mining technique with automatically formed gob-side entry retaining was proposed for longwall mining and roadway deformation [26]. Wang et al [27] proposed a liquid directional cutting technology instead of blasting roof cutting to solve the problem of pressure relief in blasting roof cutting. To solve the problem of deformation and failure of a dynamic pressure roadway, Yang et al [28] obtained the technical scheme of blasting pressure relief suitable for a dynamic pressure roadway through a theoretical analysis, numerical calculation, and industrial test.…”

Section: Introductionmentioning

confidence: 99%

Research on the Deformation Mechanism and Directional Blasting Roof Cutting Control Measures of a Deep Buried High-Stress Roadway

Yang

Liu

Yue

et al. 2020

Shock and Vibration

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Affected by the mining activities of the working face, the surrounding rock of the roadway is easily deformed and destroyed. For deep buried roadways, the deformation and destruction of the surrounding rock is particularly prominent. Under the influence of in situ stress fluctuation, 3−1103 tailgate of the Hongqinghe coal mine was in a complex stress environment with a maximum stress exceeding 20 MPa. Affected by mining stress, the roadway behind the working face was seriously deformed. In order to alleviate the deformation of the roadway, directional blasting and cutting measures for the 3−1103 tailgate were adopted in this paper. The mechanism of crack propagation in single-row to three-hole directional blasting was revealed by numerical simulation. The blasted rock was divided into three regions according to the crack condition. The numerical analysis of the cutting heights of 0 m, 10 m, 12 m, and 14 m, respectively, showed the stress peaks of different cutting heights and the deformation law of the surrounding rock. The pressure relief effect was the best at 14 m cutting height. At this time, the peak stress was 39 MPa with the smallest roadway deformation. Based on numerical simulation and theoretical analysis results, engineering tests were carried out. Field monitoring showed that the deformation of the roadway was inversely proportional to the roof cutting height. The higher the cutting height is, the more preferential the roadway is to reach the stable state. It can be concluded that directional blasting can change the surrounding rock structure, control the deformation of the roadway, and play a role in pressure relief. It provides a new measure to control roadway deformation.

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Section: Introductionmentioning

confidence: 99%

Research on the Deformation Mechanism and Directional Blasting Roof Cutting Control Measures of a Deep Buried High-Stress Roadway

Yang

Liu

Yue

et al. 2020

Shock and Vibration

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“…The deformation of the surrounding rock of the chamber is monitored using the cross method [43]. As shown in Figure 16, four measuring points are arranged in the surrounding rock of the chamber, which are located at the two ribs, the dome, and the roof, respectively [44,45]. The monitoring results provide the magnitudes of the rib convergence and the roof-to-floor convergence.…”

Section: Field Measurement Of Chamber Deformationmentioning

confidence: 99%

Deformation and failure mechanism of full seam chamber with extra-large section and its control technology

et al. 2020

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In order to effectively predict and control the rib spalling and roof leakage, it is necessary to reveal the deformation and failure mechanism of the chamber and propose the corresponding surrounding rock control technology. Based on uniaxial compression experiments and numerical simulations, it is concluded that coal body damage is dominated by shear failure during uniaxial compression, which indicates to some extent the main form of damage of the surrounding rock in the chamber. Then the combined finite and discrete element method is used to establish a numerical model to reveal the evolution law of fracture in the surrounding rock. The simulation results show that after the excavation of the chamber, a large amount of shear failure occurred in the ribs and the roof. Then those cracks further developed, expanded, penetrated, and finally connected with the surface of the chamber. Under the effect of the mine pressure, the coal body is separated from the surface of the chamber, leading to the occurrence of rib spalling and roof leakage. So it was given that support method by controlling crack development. The grouting and high-strength anchor bolt and anchor cable are proposed to improve the shear strength of the surrounding rock, which helps to reduce the occurrence of cracks, and inhibit the cracks from interpenetrating. An industrial test was carried out in the chamber of Tashan Coal Mine, which showed good control effect of the surrounding rock in the chamber.

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“…At present, directional hydraulic fracturing technology has made a significant difference in the control of coal seam hard top roof [1][2][3][4], the weakening and falling of hard top coal [5,6], the control of rock burst [7][8][9], gob retaining roadway, and the increased permeability of methane-bearing coal seam and shale oil and gas layer [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on the Basic Rules of Multihole Linear Codirectional Hydraulic Fracturing

Wang

Zhang

2020

Geofluids

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Directional rupture is one of the most important and common problems in rock breaking engineering. The purpose of directional rock breaking can be effectively realized by using multihole linear codirectional hydraulic fracturing. In this paper, realistic failure process analysis (RFPA) software is used to verify the experimental results of multihole linear codirectional hydraulic fracturing and investigate its basic law. The following results are demonstrated: (1) RFPA software can be very helpful to study the basic law of multihole linear codirectional hydraulic fracturing; (2) the process of multihole linear codirectional hydraulic fracturing can be divided into four stages: water injection boost, fracture initiation, stable fracture propagation, and fracture connection; and (3) multihole linear codirectional hydraulic fractures propagate along the direction of borehole distribution. Multihole codirectional hydraulic fracturing is influenced by the angle between the direction of the hole distribution and maximum principal stress, the difference of the principal stress, and the spacing of the boreholes. The smaller the angle, the difference value of the principal stress, and the hole spacing, the better the multihole codirectional hydraulic fracturing effect.

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Test of a liquid directional roof-cutting technology for pressure-relief entry retaining mining

Cited by 28 publications

References 26 publications

Research on the Deformation Mechanism and Directional Blasting Roof Cutting Control Measures of a Deep Buried High-Stress Roadway

Research on the Deformation Mechanism and Directional Blasting Roof Cutting Control Measures of a Deep Buried High-Stress Roadway

Deformation and failure mechanism of full seam chamber with extra-large section and its control technology

Numerical Simulation on the Basic Rules of Multihole Linear Codirectional Hydraulic Fracturing

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