Modeling and simulation of strata movement for protective seam mining with large interburden

Chang-sheng, Song; Li, Dehai; Li, Huamin

doi:10.1007/s12404-009-0109-6

Cited by 2 publications

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“…Thakur 26 pointed out that the gas emission space might extend to 270 ft (82.3 m) below and 1000 ft (304.8 m) above the mining coal seam, which laid the foundation for the remote protection of coal seam mining. Song et al 27 and Liu et al 28 discussed the possibility of remotely protected coal seam mining (layer spacing of 150 and 129 m, respectively) based on modeling and numerical simulation of simulated material scale. The follow‐up field studied by Liu et al 29 confirmed that under specific geological conditions, the long‐distance protective layer could also obtain sufficient decompression effect.…”

Section: Introductionmentioning

confidence: 99%

Study on stress evolution law of upper coal seam in long‐distance advance mining of lower coal seam

Fang

Sun

et al. 2023

Energy Science & Engineering

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With the shift of coal resources to deep mining, the occurrence of longdistance coal seams has increased, and protective layer mining is facing new challenges. This paper attempts to explain the stress evolution law of the upper coal group in the long-distance mining of the lower coal group in Pingdingshan No. 8 Coal Mine. A simulation model of advance mining of lower-group coal long-distance was established. The stress evolution law of the upper coal seam under the influence of advanced mining disturbance of the lower coal seam is studied. The following conclusions were obtained: The advance mining of the lower coal group had a positive or negative impact on the stress distribution of the upper coal seam group. With the recovery of the lower coal group of the F-21030 working face, the overburden of the F-21030 goaf finally formed a "Y" type pressure relief area. The pressure relief effect of the E-21070 working face near the stopping line was obvious. The coal seam of Group E was divided into three areas affected by the advance mining of the lower coal seam. The maximum pressure relief value was 6.6% lower than the initial stress.According to the simulation results, the E-21070 working face was divided into three regions, namely, the pressure relief region, the stress increase region, and the original stress region. According to the field drainage results of pressure relief gas, the extraction curve could be divided into three parts, namely, the stable area, pressure relief area, and stress recovery area. The maximum pure gas drainage volume could reach seven to eight times of the original area. The pressure relief extraction effect was remarkable, and the optimal extraction range was 22-210 m behind the coal face of the group.

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Section: Introductionmentioning

confidence: 99%

Study on stress evolution law of upper coal seam in long‐distance advance mining of lower coal seam

Fang

Sun

et al. 2023

Energy Science & Engineering

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“…Thakur (2006) indicated that the gas emission space may extend to 270 ft (82.3 m) below the coal seam being mined and 1000 ft (304.8 m) above it, which laid the foundation of remote protective seam mining. Song et al (2009) andLiu et al (2010) discussed the possibility of remote protected seam mining (layer spacing: 150 m and 129 m respectively) based on simulated material scale modeling and numerical simulation. The follow-up field studies from Liu et al (2013) confirmed that under certain geological situation it is feasible for the protected seams to get sufficient pressure-relief effects even under such a long distance.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the remote lower protective seam mining for coal mine gas control: A typical case study from the Zhuxianzhuang Coal Mine, Huaibei Coalfield, China

Jin

Wang

et al. 2016

Journal of Natural Gas Science and Engineering

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a b s t r a c tThe protective seam mining technology is the most effective and economical method in realizing the safe mining of outburst-prone coal seams. To study the effects of remote lower protective seam mining on coal mine gas control, a typical case (average layer spacing: 78 m) taken from the Zhuxianzhuang Coal Mine was investigated by a comprehensive evaluation through numerical simulation, gas extraction data statistics, residual gas pressure/content measurements and recovering gas emission analysis. The results indicate that after the recovery of the protective seam, the unloading effects could lead to a maximum expansion deformation rate of the protected seam by 33.4‰, which remarkably increases the permeability of the coal seam by 4320 times. Combining with the pressure-relief gas extraction methods, considerable amount of the gas (about 78.58%) was extracted from the protected seam, resulting in the maximum residual gas pressure and content of 0.26 MPa and 4.29 m 3 /t respectively, which indicate that the outburst risk has been completely eliminated. Additionally, among the gas extraction methods, the penetrating borehole extraction presents the best drainage effect, accounting for 42.58%e55.09% of the total extracted pressure-relief gas. The effect of the surface wells extraction is closely related to the number of wells and whether the wells can work properly or not. However, the effect of interception boreholes extraction is poor and the extracted amount is almost negligible. Moreover, a protected range extension phenomenon is noticed, which demonstrate that the protected area generated by the protective seam mining is larger than that of the theoretical predicted one, and thus a further study is needed.

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Modeling and simulation of strata movement for protective seam mining with large interburden

Cited by 2 publications

References 0 publications

Study on stress evolution law of upper coal seam in long‐distance advance mining of lower coal seam

Study on stress evolution law of upper coal seam in long‐distance advance mining of lower coal seam

Evaluation of the remote lower protective seam mining for coal mine gas control: A typical case study from the Zhuxianzhuang Coal Mine, Huaibei Coalfield, China

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