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Mechanism and Control Methods of Roof Deformations in Gob-Side Entry Retention by Roof Cutting Under Medium-Thick Coal Seams

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Abstract

In order to ensure the successful implementation of gob-side entry retention by roof cutting under medium-thickness coal seams and compound roof conditions in Guandi Coal Mine, a mechanical model was established to analyze the factors affecting the roof deformation, and the roof fracturing height and roof fracturing direction were researched by way of numerical simulation and field experiments. The theoretical analysis and numerical simulation showed that the rotation angle of the upper main roof is the main factor leading to roof deformation, that increasing the support strength in the roadway cannot reduce the roof deformation, and that the roof deformation can be effectively controlled by increasing the roof fracturing height and the fracturing direction. The results confirmed that the roof fracturing height was 7 m, the roof fracturing direction was 15°, and the charging structure was 3 + 3 + 2 + 1. The roof was strengthened using a constant resistance and large deformation anchor, a single hydraulic prop reinforcement support in the lane, and a U-shaped steel retaining gangue support. The retained entry was stable at 200 m behind the working face and can meet the demands of reuse for the next mining face.

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References

  • Chen JH, Zhang JS, Li XP (2016) Study of presplitting blasting parameters and its application based on rock blasting-induced damage theory. Rock Soil Mech 37(5):1441–1450 (in Chinese)

    Google Scholar 

  • Deng YH, Wang SQ (2014) Feasibility analysis of gob-side entry retaining on a working face in a steep coal seam. Int J Min Sci Technol 24(4):499–503

    Article  Google Scholar 

  • Gao F, Qian MG, Miao XX (2000) Mechanical analysis of the immediate roof subjected to given deformation of the main roof. Chin J Rock Mech Eng 19(2):145–148 (in Chinese)

    Google Scholar 

  • Gao YB, Guo ZB, Yang J, Wang JW, Wang YJ (2017) Steady analysis of gob-side entry retaining formed by roof fracturing and control techniques by optimizing mine pressure. J China Coal Soc 42(7):1672–1681 (in Chinese)

    Google Scholar 

  • Gao YB, He MC, Yang J, Ma XG (2018) Experimental study of caving and distribution of gangues influenced by roof fracturing in pillarless mining with gob-side entry retaining. J China Univ Min Technol 47(1):21–31 and 47 (in Chinese)

    Google Scholar 

  • Guo PF, Zhang GF, Tao ZG (2016) Blasting technology of gateway retaining along gob pressure release by roof cutting in hard and weak complex roof. Coal Sci Technol 44(10):120–124 (in Chinese)

    Google Scholar 

  • Han CL, Zhang N, Ran Z, Gao R, Yang HQ (2018a) Superposed disturbance mechanism of sequential overlying strata collapse for gob-side entry retaining and corresponding control strategies. J Cent South Univ 25(9):2258–2271

    Article  Google Scholar 

  • Han CL, Zhang N, Xue JH, Kan JG, Zhao YM (2018b) Multiple and long-term disturbance of gob-side entry retaining by grouped roof collapse and an innovative adaptive technology. Rock Mech Rock Eng. https://doi.org/10.1007/s00603-018-1612-0

    Article  Google Scholar 

  • He MC, Zhu GL, Guo ZB (2015) Longwall mining “cutting cantilever beam theory” and 110 mining method in China—the third mining science innovation. J Rock Mech Geotech Eng 7(5):483–492

    Article  Google Scholar 

  • He MC, Gao YB, Yang J, Gong WL (2017a) An innovative approach for gob-side entry retaining in thick coal seam longwall mining. Energies 10(11):1785

    Article  Google Scholar 

  • He MC, Chen SY, Guo ZB, Yang J, Gao YB (2017b) Control of surrounding rock structure for gob-side entry retaining by cutting roof to release pressure and its engineering application. J China Univ Min Technol 46(5):959–969 (in Chinese)

    Google Scholar 

  • He MC, Wang YJ, Yang J, Zhou P, Gao Q, Gao YB (2018a) Comparative analysis on stress field distributions in roof cutting non-pillar mining method and conventional mining method. J China Coal Soc 43(3):626–637 (in Chinese)

    Google Scholar 

  • He MC, Ma ZM, Guo ZB, Chen SY (2018b) Key parameters of the gob-side entry retaining formed by roof cutting and pressure release in deep medium-thickness coal seams. J China Univ Min Technol 47(3):468–477 (in Chinese)

    Google Scholar 

  • Lin HL, Shi YK (2012) Research on walling-up with concrete block technology of gob-side entry retaining based on fully mechanized face in medium-thickness coal seam. Appl Mech Mater 121–126:2878–2882

    Google Scholar 

  • Lu XY, Hua XZ, Zhao MQ (2011) Calculation and analysis of immediate roof subsidence in gob-side entry retaining. J Min Saf Eng 28(1):34–38 (in Chinese)

    Google Scholar 

  • Ma XG, He MC, Wang J, Zhu XQ, Li CL, Zhang JB, Jiang QQ (2017) Study on design of chamber supporting behind cutting hole under condition of gob-side entry retaining in 8304 face of Yanya coal mine. Coal Technol 36(12):30–33 (in Chinese)

    Google Scholar 

  • Ma XG, He MC, Sun JD, Hu J, Zhang XY, Zhang JB (2018a) Research on the design of roof cutting parameters of non-coal pillar gob-side entry retaining mining with roof cutting and pressure releasing. Geotech Geol Eng 37:1169–1184

    Google Scholar 

  • Ma XG, He MC, Sun JD, Wang HH, Liu XY, Zhen EZ (2018b) Neural network of roof cutting blasting parameters based on mines with different roof conditions. Energies 11(12):3468

    Article  Google Scholar 

  • Qian MG, Miao XX (1996) New development of face underground pressure theory. Ground Press Strata Control 13(2):17–20 (in Chinese)

    Google Scholar 

  • Qian MG, Miao XX, He FL, Liu CY (1996) Mechanism of coupling effect between supports in the workings and the rocks. J China Coal Soc 21(1):40–44 (in Chinese)

    Google Scholar 

  • Sitharam TG, Maji VB, Verma AK (2007) Practical equivalent continuum model for simulation of jointed rock mass using FLAC3D. Int J Geomech 7(5):389

    Article  Google Scholar 

  • Sun XM, Liu X, Liang GF, Wang D, Jiang YL (2014) Key parameters of gob-side entry retaining formed by roof cut and pressure releasing in thin coal seams. Chin J Rock Mech Eng 33(7):1449–1456 (in Chinese)

    Google Scholar 

  • Waclawik P, Kukutsch R, Konicek P, Ptacek J et al (2017) Stress state monitoring in the surroundings of the roadway ahead of longwall mining. Procedia Eng 191:560–567

    Article  Google Scholar 

  • Wang XY, Shang DY, Liu N, Li SY, Fan X (2014) Analysis design and roof motion track simulation for gob-side entry retaining hydraulic support. Appl Mech Mater 633–634:1244–1247

    Article  Google Scholar 

  • Wang YJ, Gao YB, Wang EY, He MC, Yang J (2018) Roof deformation characteristics and preventive techniques using a novel non-pillar mining method of gob-side entry retaining by roof cutting. Energies 11(3):627

    Article  Google Scholar 

  • Xu Y, Chen J, Bai JB (2016) Control of floor heaves with steel pile in gob-side entry retaining. Int J Min Sci Technol 26(3):527–534

    Article  Google Scholar 

  • Yang HY, Cao SG, Wang SQ, Fan YC, Wang S, Chen XZ (2016) Adaptation assessment of gob-side entry retaining based on geological factors. Eng Geol 209:143–151

    Article  Google Scholar 

  • Zhang N, Yuan L, Han CL, Xue JH, Kan JG (2012) Stability and deformation of surrounding rock in pillarless gob-side entry retaining. Saf Sci 50(4):593–599

    Article  Google Scholar 

  • Zhang ZZ, Bai JB, Chen Y, Yan S (2015) An innovative approach for gob-side entry retaining in highly gassy fully-mechanized longwall top-coal caving. Int J Rock Mech Min Sci 80:1–11

    Article  Google Scholar 

  • Zhang ZZ, Wang WJ, Li SQ, Yu XY (2018) Analysis on rockbolt support interaction with roof dilatancy above roadside backfill area in gob-side entry retaining. Geotech Geol Eng 36(4):2577–2591

    Article  Google Scholar 

Download references

Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 41672347). We also express our thanks to the reviewers for their time and effort on reviewing this paper.

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Authors and Affiliations

  1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing, 100083, China

    Xiaojie Yang, Wenbin Mao, Yue Sun, Jiamin Wang & Manchao He

  2. School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, 100083, China

    Xiaojie Yang, Wenbin Mao, Yue Sun, Jiamin Wang & Manchao He

  3. Institute of Mining Research, Inner Mongolia University of Science and Technology, Baotou, 014010, Inner Mongolia, China

    Eryu Wang

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  1. Xiaojie Yang
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  2. Wenbin Mao
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  3. Eryu Wang
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  4. Yue Sun
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  5. Jiamin Wang
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  6. Manchao He
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Correspondence to Wenbin Mao.

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Yang, X., Mao, W., Wang, E. et al. Mechanism and Control Methods of Roof Deformations in Gob-Side Entry Retention by Roof Cutting Under Medium-Thick Coal Seams. Geotech Geol Eng 38, 265–282 (2020). https://doi.org/10.1007/s10706-019-01015-8

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  • DOI: https://doi.org/10.1007/s10706-019-01015-8

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