The impact of key strata movement on ground pressure behaviour in the Datong coalfield

Kuang, Tiejun; Zhu, Liqiang; Zhu, Weibing; Xie, Jianlin; Ju, Jinfeng; Liu, Jinrong; Xu, Jizhao

doi:10.1016/j.ijrmms.2019.04.010

Cited by 50 publications

(28 citation statements)

References 12 publications

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“…Mining activity at a single longwall face in the UCS will cause destruction of the old roof stratum following a vertical “O‐X” pattern, after which a “masonry beam” structure will form in the overlying stratum . As demonstrated by a considerable number of studies, the mining activities at multiple longwall faces will enlarge the fracture zone of the overlying stratum when the coal seam is deeply buried.…”

Section: Physical Modeling Of Roof Movementmentioning

confidence: 99%

“…Mining activity at a single longwall face in the UCS will cause destruction of the old roof stratum following a vertical "O-X" pattern, after which a "masonry beam" structure will form in the overlying stratum. [26][27][28][29][30][31] As demonstrated by a considerable number of studies, [31][32][33][34][35][36][37] the mining activities at multiple longwall faces will enlarge the fracture zone of the overlying stratum when the coal seam is deeply buried. In this case, the key layers located in the upper middle part of the fracture zone far away from the coal seam may experience rotation or fracturing and become unstable.…”

Section: Ucs Main Roofmentioning

confidence: 99%

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Study on the movement characteristics of the overlying stratum and surrounding rock control in ultraclose coal seams: A case study

Zhu¹,

Yao²,

Xia³

et al. 2020

Energy Science & Engineering

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In Fucun Coal Mine, the average spacing between the 3upper coal seam (UCS) and 3lower coal seam (LCS) is only 6 m. In the process of mining upper coal, the lower roadway (LR), which is 60 m away from upper pillar, becomes unstable. In order to control the surrounding rock of lower roadway, a physical model experiment and a 3D numerical calculation were performed in this study. The results of physical similarity simulation experiment show that mining of longwall face in UCS will lead to fracturing of key layers at a high elevation (KLHE) far away from the coal seam. The expanded goaf area caused large‐scale fracturing and rotation of the KLHE, which resulted in significant strata pressure behavior in LR. The numerical calculation results show that the LR should be within 19 m of the coal pillar. Finally, a plan which includes a proper location and a supporting system was proposed. The feasibility of the proposed plan is verified by an industrial application.

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Section: Physical Modeling Of Roof Movementmentioning

confidence: 99%

Section: Ucs Main Roofmentioning

confidence: 99%

Study on the movement characteristics of the overlying stratum and surrounding rock control in ultraclose coal seams: A case study

Zhu¹,

Yao²,

Xia³

et al. 2020

Energy Science & Engineering

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“…The Datong coalfield is one of the most important coal-producing areas in china, with a total coal reserve of 71.8 billion tons (Kuang et al., 2019). In recent years, the annual coal output of the entire coalfield has been approximately 70 million tons.…”

Section: Introductionmentioning

confidence: 99%

Geochemical characteristics of No. 6 coal from Nanyangpo Mine, Datong coalfield, north China: Emphasis on the influence of hydrothermal solutions

Liu

Zhang

et al. 2020

Energy Exploration & Exploitation

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This paper discusses the volcanic influence on the mineralogical and elemental geochemistry of No. 6 coal from Nanyangpo Mine in the Datong coalfield, north China. Sixteen samples (14 coal and 2 partings) were analyzed by different geochemical methods. The results revealed that the No. 6 coal is a medium–high volatility, highly calorific, bituminous coal with a low-ash and medium-sulfur content. The minerals mainly consisted of kaolinite, calcite, dolomite, and pyrite. In addition, traces of apatite, sphalerite, and anatase were also found. Calcite, dolomite, and pyrite in the coal samples were mainly derived from epigenetic hydrothermal solutions, whereas kaolinite and apatite originated from volcanic ash. Harmful trace elements including Pb, Cu, Mo, Tl, and Hg in the No. 6 coal samples were higher than those of common global coals. These harmful elements mainly occurred in sulfide minerals, which were probably influenced by hydrothermal inputs.

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“…This study was conducted based on this theory as well. At present, researchers have conducted many studies on these problems [11][12][13][14][15][16][17][18][19]. Based on field monitoring and analytical study, three types of structural models have been found and defined by Ju and Xu [11].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, a method was put forward for calculating the working resistance for 7.0 m height chocks. According to Kuang et al [12], it is very important to establish the time-space correspondence between the movement of the KS and the abutment pressure behaviors. However, most of these studies were conducted in shallow strata and were incomplete in terms of the investigation of the lateral structural characteristics, the movement of the key strata, and its impact on the barrier pillar and auxiliary entry.…”

Section: Introductionmentioning

confidence: 99%

Directional Blasting Fracturing Technology for the Stability Control of Key Strata in Deep Thick Coal Mining

et al. 2019

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Under the conditions of high ground stress and mining disturbance, the strata breakage that is induced by mining is severe. Thus, it is critical to investigate the structural characteristics of key strata (KS) in deep thick mining. This study introduces an innovative technology, namely, directional blasting fracturing, in which an energy-gathering tube is installed in a borehole and an explosive is detonated to break the roof in a specified direction. A theory of balanced bulk filling is established based on the requirements of developing a voussoir beam structure, which can be used to effectively evaluate the percentage of bulk filling in gob and to determine to which structure the key strata belongs. Based on this theory, two types of novel structural models in the advancing and lateral directions of the longwall face are established and defined for studying the roof fracturing mechanism. Compared with a cantilever structure, Model C can develop a stable voussoir beam structure, limiting the rotation space of the KS and reducing both the peak abutment pressure and the dynamic disturbance time in the advancing of the longwall face. Model E is defined as when the technology of directional blasting fracturing effectively cuts a stress transfer path into the barrier pillar. The peak abutment pressures on the barrier pillar and auxiliary entry are smaller, and the dynamic disturbance time is shorter, which can effectively improve the stability of the auxiliary entry. The key parameters of directional blasting fracturing are designed and constructed, and they include the roof fracturing height, angle, and charge structure. The field application performance of this innovative technology at the longwall face of 3−1101 in Hongqinghe coal mine was evaluated by analyzing the chock pressure stress, the pillar pressure stress, and the deformation of the auxiliary entry during mining, which lays a foundation for the application of this technology in coal mines in China.

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The impact of key strata movement on ground pressure behaviour in the Datong coalfield

Cited by 50 publications

References 12 publications

Study on the movement characteristics of the overlying stratum and surrounding rock control in ultraclose coal seams: A case study

Study on the movement characteristics of the overlying stratum and surrounding rock control in ultraclose coal seams: A case study

Geochemical characteristics of No. 6 coal from Nanyangpo Mine, Datong coalfield, north China: Emphasis on the influence of hydrothermal solutions

Directional Blasting Fracturing Technology for the Stability Control of Key Strata in Deep Thick Coal Mining

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