Abstract
Classic coal pillar design theory is inapplicable to engineering practice involving the design of coal pillars for deep roadways. Aiming at this problem, the current research investigated the shape of plastic zones in the rocks surrounding a deep mining roadway based on theoretical analysis, numerical simulation and field tests. On this basis, the influence of coal pillar dimensions on the principal stress direction of the stress field in the surrounding rock zone, the distribution pattern of the plastic zone and the stability of roofs of a deep mining roadway was investigated. In addition, the study revealed the mechanical essence of the coal pillar dimensional influence on the shape of the plastic zone in the rocks surrounding a deep mining roadway. The result showed that a butterfly wing-shaped plastic zone appeared in the strata at different roof positions owing to the coal pillar dimension causing a change in principal stress direction. When the butterfly wing-shaped plastic zone was located in the strata of the coal pillar of the roof, the influence on the stability of the roof was the lowest, while it was the greatest when it was located in the strata in the middle part of the roof. On this basis, the study proposed a coal pillar design method for deep mining roadways based on regulating the shape of plastic zones in the rocks surrounding the deep mining roadway: this provides a new theory and method for the optimal design of the coal pillar dimension for deep roadways.
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References
Galvin JM, Hepplewhite BK (1996) Australian coal Pillar performance [J]. Rep Univ N S Male (3):102–106
Guangxiang X, Ke Y, Jucai C (2006) Effect of coal pillar width on the stress distribution law of surrounding rocks in fully mechanized top-coal caving mining face[J]. J Univ Sci Technol Beijing 28(11):1005–1008 1013
Ji LI, Hongtao LIU, Zhigang WANG, Hao ZHANG (2013) Study on over-long bolt and anchor combined support technology of large cross section open - off cut based on thin base rock [J]. Coal Eng 45(7):36–38 + 41
Ji LI, Jicheng FENG, Shengkai ZHANG et al (2015) Study on long and short bolt coordinate support technology of mine soft rock roadway[J]. Coal SciTechnol 43(3):17–21
Jianbiao BAI, Chaojiong HOU, Hanfu HUANG (2004a) Numerical simulation study on stability of narrow coal pillar of roadway driving along goaf[J]. Chinese Journal of Rock Mechanics and. Engineering 23(20):3475–3479
Jianbiao BAI, Huaqiang ZHOU, Chaojiong HOU et al (2004b) Development of support technology beside roadway in goaf-side entry retaining for next sublevel [J]. J China Univ Min Technol 32(2):183–186
Jiang L, Zhang P, Chen L (2017) Numerical approach for goaf-side entry layout and yield pillar design in fractured ground conditions. Rock Mech Rock Eng 50(11):3049–3071
Kang P, Zhaopeng L, Quanle Z, Zhenyu Z, Jiaqi Z (2019) Static and dynamic mechanical properties of granite from various burial depths. Rock Mech Rock Eng 4:1–22
Khairila A (2003) Study on stress rock arch development around dual caverns [D], Singapore, College of Civil engineering, Nanyang techlogical University
Li CC (2006) Rock support design based on the concept of pressure arch[J]. Int J Rock Mech Min Sci 43(7):1083–1090
Najafi M, Shishebori A, Gholamnejad J (2017) Numerical estimation of suitable distance between two adjacent panels’ working faces in shortwall mining. Int J Geomech 17(4):040160901–0401609011
Newman DA (1995) Planning and design for barrier pillared recovery: three case histories[J]. Intl Conf Ground Min (1):1048–1053
Nianjie MA, Ji LI, Zhiqiang ZHAO (2015a) Distribution of the deviatoric stress field and plastic zone in circular roadway surrounding rock[J]. J China Univ Min Technol 44(2):206–213
Nianjie MA, Ji LI, Xidong ZHAO et al (2015b) High quality gas channel and its construction method applied to coal and gas simultaneous extraction in deep mining[J]. J China Coal Soc 40(4):742–748
Palei SK, Das SK (2008) Sensitivity analysis of support safety factor for predicting the effects of contributing parameters on roof falls in underground coal mines[J]. Int J Coal Geol 75(4):241–247
Qihua MA, Yitai WANG (2009) Mechanism of narrow pillar protecting roadway and support technology of gob-side entry in deep mine [J]. J Min Saf Eng 26(4):520–523
Shangxian YIN (2007) Numerical simulation of influence of water barrier pillars for subsided column on rock failure in mining process[J]. J China Coal Soc 31(2):179–182
Shaojie C, Hailong W, Huaiyuan W, Weijia G, Xiushan L (2016) Strip coal pillar design based on estimated surface subsidence in Eastern China[J]. Rock Mech Rock Eng 49(9):3829–3838
Wilson AH (1972) A hypothesis concerning pillar stability. Min Eng 131:409–417
Wilson AH (1982) Pillar stability in log wall mining state of the art of ground control in long wall mining and mining subsidence[J]. Soeiety of Mining Engineers, New York, pp 77–88
Zhiqiang Z, Nianjie M, Xiaofei G et al (2016) Falling principle and support design of butterfly-failure roof in large deformation mining roadways[J]. J China Coal Soc 41(12):2932–2939
Борисов АА (1986) Kuang Shan Ya, Li Yu Ji Suan [M]. China Coal Industry Publishing House, Beijing, pp 56–62
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This study was supported by National Natural Science Foundation of China (No. 51804243) and funded by the Natural Science Basic Research Plan of Shaanxi Province of China (No. 2018JQ5200)
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Li, J. The coal pillar design method for a deep mining roadway based on the shape of the plastic zone in surrounding rocks. Arab J Geosci 13, 454 (2020). https://doi.org/10.1007/s12517-020-05501-9
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DOI: https://doi.org/10.1007/s12517-020-05501-9