Mining-induced strata stress changes, fractures and gas flow dynamics in multi-seam longwall mining

Guo, Hua; Yuan, Liang; Shen, Baotang; Qu, Qingdong; Xue, Jianyang

doi:10.1016/j.ijrmms.2012.05.023

Cited by 238 publications

(121 citation statements)

References 6 publications

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“…During the mining process, the surrounding coal and rock of the working face are deformed under the effect of the mining pressure and their mechanical parameters, including the porosity, permeability coefficient of the coal change with the deformation, thus affecting the gas flow in the coal seam [17,18]. Therefore, based on the effect of pressure relief caused by the ground movement in the mining process, the coal and CBM were considered as mineral resources for simultaneous extraction in the mining process, forming two complete coal mining and gas drainage systems, named "coal and CBM coextraction technology" [19].…”

Section: Introductionmentioning

confidence: 99%

Coal and Coalbed Methane Co-Extraction Technology Based on the Ground Movement in the Yangquan Coalfield, China

Fu-xi

et al. 2015

Energies

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Abstract:The Yangquan coalfield is one of the typical highly gassy mining areas in China. However, its coal seams are of lower permeability, which are not conductive to coalbed methane (CBM) drainage. In this study, based on the theory of the ground movement, we analyzed the principle of coal and CBM coextraction in the Yangquan coalfield, and established the technology system of coal and CBM coextraction which was further implemented in the coal and CBM coextraction in the Yangquan coalfield. The coal and CBM coextraction technologies based on the "pressure-relief and permeability-increase" effect caused by the mining overburden movement can optimally ensure the safe and efficient mining and improve the gas drainage rate. A series of developed coal and CBM coextraction technologies for the Yangquan coalfield were mainly characterized by the high-level gas drainage roadway. This reached a maximum gas drainage amount of 270,000 m 3 /day for single drainage roadway and a pressure-relief gas drainage rate of >90%. Those technologies significantly improved the gas drainage effect safely and efficiently achieving the coal and CBM coextraction. OPEN ACCESSEnergies 2015, 8 6882

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Section: Introductionmentioning

confidence: 99%

Coal and Coalbed Methane Co-Extraction Technology Based on the Ground Movement in the Yangquan Coalfield, China

Fu-xi

et al. 2015

Energies

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“…It indicates that, as the mining disturbance, in-situ stress reconstructs in a wide region and finally reaches to a new balanced state [18]. In the stress relaxation zone of interlayer rock stra- tum, vertical stress changes sharply with a great decrement.…”

Section: Stress Redistribution In Interlayer Rock Stratummentioning

confidence: 96%

Lateral Stress Concentration in Localized Interlayer Rock Stratum and the Impact on Deep Multi-Seam Coal Mining

Zhang¹,

Shimada²,

Sasaoka³

et al. 2013

IJG

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To explore the impact of lateral stress concentration in interlayer rock stratum on the exploitation of protected coal seam, a field experiment was carried out in a multi-seam mining structure. Lateral stress redistribution and interlayer rock failure behavior were surveyed. Then an assistant numerical investigation was implemented to evolve the effect of liberated seam mining and its influence on stress reconstruction in surrounding rock mass. The cause of lateral stress concentration and its impact were discussed finally. Key findings turn out that a certain lateral stress increases in interlayer rock stratum and concentrates on its lower region. Lateral stress concentration and interlayer rock failure are interactional. The former is an inducing factor of the latter; the latter promotes the increase of concentration degree. Extent of lateral stress concentration increases to the maximum as seam distance is about 50 m. But the efficacy of liberated seam mining decreases as the seam spacing gets larger. Protected seam mining is then classified based upon the impact of lateral stress concentration, which helps to prevent the rock burst hazard and then to achieve a reliable mining in deep mines.

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“…Many experiments have demonstrated that there is a positive relationship between fracture occurrence and stress-relief effects [34][35][36].…”

Section: (I) Coalbed Gas Flowmentioning

confidence: 99%

Addressing the CO 2 emissions of the world's largest coal producer and consumer: Lessons from the Haishiwan Coalfield, China

Younger

Wang

et al. 2015

Energy

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Mining-induced strata stress changes, fractures and gas flow dynamics in multi-seam longwall mining

Cited by 238 publications

References 6 publications

Coal and Coalbed Methane Co-Extraction Technology Based on the Ground Movement in the Yangquan Coalfield, China

Coal and Coalbed Methane Co-Extraction Technology Based on the Ground Movement in the Yangquan Coalfield, China

Lateral Stress Concentration in Localized Interlayer Rock Stratum and the Impact on Deep Multi-Seam Coal Mining

Addressing the CO 2 emissions of the world's largest coal producer and consumer: Lessons from the Haishiwan Coalfield, China

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