Safe strategy for coal and gas outburst prevention in deep-and-thick coal seams using a soft rock protective layer mining

Wang, Liang; Lu, Zhuang; Chen, Dapeng; Liu, Qingquan; Chu, Peng; Shu, Longyong; Ullah, Barkat; Wen, Zhen

doi:10.1016/j.ssci.2020.104800

Cited by 86 publications

(45 citation statements)

References 23 publications

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“…It can be seen in Figure 11 that the unreamed conventional borehole has a single-hole initial gas drainage rate of 50.74 m 3 /d and a single-hole cumulative gas drainage rate of 736.12 m 3 within 30 days. The initial single-hole gas drainage volume of the reaming borehole is 178.74 m 3 /d, and the cumulative single-hole gas drainage volume in 30 days is 2227.57 m 3 . After reaming, the initial gas drainage scalar of a single hole increased 3.52 times of the original unreamed conventional drilling and the average cumulative gas drainage scalar of a single hole reached 3.03 times of the original unreamed conventional drilling.…”

Section: Analysis Of Monitoring Resultsmentioning

confidence: 99%

“…In view of the coal and gas outburst theory and prevention measures, predecessors have done a lot of in-depth research and also achieved many fruitful research results. Wang et al [3] chose the soft rock layer as the first protective layer of the deep coal seam in Luling Coal Mine in the Huaibei Coalfield. At the same time, they established the safety engineering of the three-dimensional drainage and utilization system.…”

Section: Introductionmentioning

confidence: 99%

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Research on the Coal Seam Permeability-Increasing Technology via High-Pressure Water Jet Reaming and Its Application

et al. 2021

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Aiming at the problem of coal and gas outburst prevention and control in serious outburst dangerous coal seam under complex geological conditions in Qidong Coal Mine, the water jet drilling and expanding integrated device was used to implement the measures that expand holes and increase permeability by high-pressure water at a 912 working face. The experimental results show that when the pump pressure is between 13 MPa and 15 MPa, the particle size of pulverized coal can be effectively reduced and the discharge of pulverized coal can be increased. The coal output of a single hole is 0.8~2.3 t/m, with an average of 1.1 m/t. The unreamed conventional borehole has a single-hole initial gas drainage rate of 50.74 m3/d and a single-hole cumulative gas drainage rate of 736.12 m3 within 30 days. The initial single-hole gas drainage volume of the reaming borehole is 178.74 m3/d, and the cumulative single-hole gas drainage volume in 30 days is 2227.57 m3. After reaming, the initial gas drainage scalar of a single hole increases 3.52 times of the original unreamed conventional drilling and the average cumulative gas drainage scalar of a single hole reaches 3.03 times of the original unreamed conventional drilling. This technology and equipment have a good promotion and application value in gas treatment of soft, low-permeable coal seams.

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Section: Analysis Of Monitoring Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on the Coal Seam Permeability-Increasing Technology via High-Pressure Water Jet Reaming and Its Application

et al. 2021

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“…B. Hodot conducted the simulation experiments on coal and gas outburst with soft coal for the first time, subsequently followed by a lot of coal and gas outbursts by many other researchers, but most of them utilized pulverized coal as the experimental materials and focused mainly on soft coal outburst. Besides, the coal strength is one of the important parameters of the coal physical and mechanical properties of coal, but it was not taken as the variable index of outbursts [10][11][12]. It is found that coal strength is closely related to outburst indexes such as coal quality, outburst distance, and hole depth.…”

Section: Introductionmentioning

confidence: 99%

Mechanism and Classification of Coal and Gas Outbursts in China

Zhang

Yang

et al. 2021

Advances in Civil Engineering

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Coal and gas outburst is a kind of complex dynamic disaster with short duration and strong explosiveness, and the modes and strength of the outburst are determined by the in situ stress, gas pressure, and physical and mechanical properties of the coal mass. In this paper, the status quo of research on the mechanism of coal and gas outburst in China is described from three aspects: the controlling effect of single factor, the controlling effect of multi-factor, and new understandings of the outburst mechanism in recent years. Firstly, controlling factors of coal and gas outburst are classified for an in-depth analysis of the main factors of the same type of disasters, and the research progress and new understandings of the mechanism of coal and gas outburst are systematically sorted out. Secondly, the influencing factors of the strength coal mass are analyzed, and the related issues of coal mass strength on coal and gas outburst disaster mechanism are discussed. The results show that the stages of incubation, occurrence, development, and stop on coal and gas outburst are affected by the coupling effects of in situ stress field, gas pressure field, and seepage field, and the coal strength becomes an important factor affecting outburst strength under the same in situ stress and gas pressure. Therefore, the scientific and reasonable improvement methods of such similar simulation experiment devices are proposed according to the existing experimental methods and devices, which is of great significance to provide ideas for the continuous transferring to deep mining and preventing coal and gas outburst in China in the future.

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“…Li [12] pointed out compared to the protective coal seam mining, the extraction of the thin coal seam would minimize the coal and gas burst hazards and it is costly and timely economical. Wang et al [13] used the soft coal seam adjacent to the thick seam as the protective coal seam. He et al [14] investigated the permeability change in the upper coal seam during the extraction of the lower protective coal seam and developed an analytical model to simulate such a change during mining operation.…”

Section: Introductionmentioning

confidence: 99%

Stress Distribution and Gas Concentration Evolution during Protective Coal Seam Mining

Niu

Shi

Zhang

et al. 2021

Advances in Civil Engineering

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Coal and gas burst is one of the significant and catastrophic hazards in underground longwall operations. To date, the protective coal seam mining has been recognized as the most effective mining method for minimizing or even avoiding the effect of the coal and gas burst. In this paper, numerical modelling and field test were carried out for the longwall operation in Qidong Coal Mine in order to investigate the induced stress and coal seam gas drainage performance in the protected coal seam after the complete extraction of the protective coal seam. It was found that four stress zones can be classified in the protected coal seam being the original stress zone, stress concentration zone, stress relief zone, and recompaction zone. In addition, the monitoring data of gas concentration and volume change in the field agree well with the numerical modelling results.

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Safe strategy for coal and gas outburst prevention in deep-and-thick coal seams using a soft rock protective layer mining

Cited by 86 publications

References 23 publications

Research on the Coal Seam Permeability-Increasing Technology via High-Pressure Water Jet Reaming and Its Application

Research on the Coal Seam Permeability-Increasing Technology via High-Pressure Water Jet Reaming and Its Application

Mechanism and Classification of Coal and Gas Outbursts in China

Stress Distribution and Gas Concentration Evolution during Protective Coal Seam Mining

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