The mechanism of bedding separation in roof strata overlying a roadway within a thick coal seam: A case study from the Pingshuo Coalfield, China

Yan, Hong; He, Fulian; Yang, Tao; Li, Linyue; Zhang, Shoubao; Zhang, Jixiong

doi:10.1016/j.engfailanal.2015.12.006

Cited by 61 publications

(31 citation statements)

References 14 publications

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“…The discontinuous area in ultra‐thick coal seams with parting is likely to occur separation . Then under the influences of underground pressure, the chamber is extremely easy to occur rib spalling and roof falling, thus increasing the difficulty in chamber support …”

Section: Introductionmentioning

confidence: 99%

Failure characteristics and control technology for large‐section chamber in compound coal seams—A case study in Tashan Coal Mine

Tai

Xia

Kuang

2019

Energy Science & Engineering

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The coal production exploited from extra‐thick coal seams accounts for 45% of China's total coal production. With large coal output, the extra‐thick coal seams require that the chamber section be more than 100 m2. In case of parting (the noncoal rock, usually mudstone, sandwiched in the coal seam) in the extra‐thick coal seams, the integrity of the coal seams will be damaged and the large‐section chamber is extremely easy to occur rib spalling and roof leakage, which will increase the chamber's supporting difficulty. To solve such problems, this paper took the electromechanical chamber in Tashan Coal Mine as the engineering background and analyzed the deformation and failure characteristics of this chamber surrounding rocks by the numerical simulation method during the excavation process. The results indicated that the failure areas of surrounding rocks were mainly in partings, chamber ribs, and chamber dome with the failure depths of 15 m, 10 m, and 5 m, respectively. Based on the obtained deformation and failure characteristics, the supporting method of grouting integrated with high‐strength bolts and anchor cables was put forward. The grouting method was firstly used to improve the integrity of the chamber surrounding rocks, and the high‐strength bolts and anchor cables were used for supporting. Then, the supporting parameters of the bolts and anchor cables and the grouting parameters were optimized by the numerical simulation method. The optimized parameters were applied in the electromechanical chamber in Tashan Coal Mine, and the on‐site chamber ribs lateral displacement and roof separation amounts were only 0.018 m and 0.012 m, respectively, indicating that the surrounding rocks were controlled effectively.

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Section: Introductionmentioning

confidence: 99%

Failure characteristics and control technology for large‐section chamber in compound coal seams—A case study in Tashan Coal Mine

Tai

Xia

Kuang

2019

Energy Science & Engineering

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“…We can know from the analysis that the content of the radionuclide in the sedimentary rocks is related to the content of clay minerals, the formation time, the environment of the sedimentary area and so on 30–32 , therefore, we carried out analysis on the radiation characteristics of the coal and roof rock in the thick and extra-thick coal seam for the selected typical mining areas such as Dongsheng, Datong, Yanzhou, Shuozhou and Longkou 33–36 . And the selected Coal Mine are Suancigou (SCG), Tongxin (TX), Xinzhouyao (XZY), Pingshuo NO.2 (PS.2), Xinglongzhuang (XLZ), Nantun (NT) and Beizao (BZ).…”

Section: Resultsmentioning

confidence: 99%

Radiation characteristics of natural gamma-ray from coal and gangue for recognition in top coal caving

Zhang

Liu

2018

Sci Rep

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Recognition of coal and gangue (roof rock) is a key technology to realize fully mechanized top coal caving automated mining. This paper proposes to detect the instantaneous refuse content of drawn coal and gangue mixture during top coal caving by using natural gamma-ray technology. The generating environment of coal and rock seams, the distribution characteristics of natural gamma ray from coal and roof-rock and the principle of coal-gangue recognition using natural gamma-ray method were analyzed. The natural gamma ray radiation characteristics of coal and roof-rock seams from seven different typical coal mine areas who has thick coal seams in China have been researched, and a connection between radiation intensity and refuse content was set up. The experiments on the mixed condition of roof-rock drawn from caving opening in the caving process of fully-mechanized top coal caving working face was taken and the radiative signals was real-time detected by using the self-developed coal-gangue recognition experimental system. The experiments results demonstrate the feasibility of using natural gamma-ray technology to perform real-time detection of refuse content of drawn coal and gangue mixture and the availability of self-developed coal-gangue recognition detector.

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“…Since the 1980s, grouting has been the main preventive measure against bed-separation water hazard. It was first tested successfully in more than a dozen coal mines, such as Fushun Laohutai Coalmine of Liaoning Province and Datun Xuzhuang Coalmine of Jiangsu Province (Chen and Guo 2008;Yan et al 2016), and then promulgated nationally. Later on, new techniques were introduced to treat bed-separation water, such as diversion and interception.…”

Section: Introductionmentioning

confidence: 99%

Research on preventive technologies for bed-separation water hazard in China coal mines

Gui¹,

Tong²,

Qiu³

et al. 2018

Appl Water Sci

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Bed-separation water is one of the major water hazards in coal mines. Targeted researches on the preventive technologies are of paramount importance to safe mining. This article studied the restrictive effect of geological and mining factors, such as lithological properties of roof strata, coal seam inclination, water source to bed separations, roof management method, dimensions of mining working face, and mining progress, on the formation of bed-separation water hazard. The key techniques to prevent bed-separation water-related accidents include interception, diversion, destructing the buffer layer, grouting and backfilling, etc. The operation and efficiency of each technique are corroborated in field engineering cases. The results of this study will offer reference to countries with similar mining conditions in the researches on bed-separation water burst and hazard control in coal mines.Keywords Bed-separation water · Influencing factors · Interception and diversion · Destruction of the buffer layer · Filling the bed separation void by grouting

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The mechanism of bedding separation in roof strata overlying a roadway within a thick coal seam: A case study from the Pingshuo Coalfield, China

Cited by 61 publications

References 14 publications

Failure characteristics and control technology for large‐section chamber in compound coal seams—A case study in Tashan Coal Mine

Failure characteristics and control technology for large‐section chamber in compound coal seams—A case study in Tashan Coal Mine

Radiation characteristics of natural gamma-ray from coal and gangue for recognition in top coal caving

Research on preventive technologies for bed-separation water hazard in China coal mines

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