Top-coal initial caving law of continuous group caving method in extra-thick coal seams

Wang Zuguang; Wang Shen; He Ziang; Li Huamin

doi:10.19606/j.cnki.jmst.2023.02.004

Volume 8 Issue 2

Mar. 2023

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Article Navigation > Journal of Mining Science and Technology > 2023 > 8(2): 166-179

Wang Zuguang, Wang Shen, He Ziang, Li Huamin. Top-coal initial caving law of continuous group caving method in extra-thick coal seams[J]. Journal of Mining Science and Technology, 2023, 8(2): 166-179. doi: 10.19606/j.cnki.jmst.2023.02.004

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Top-coal initial caving law of continuous group caving method in extra-thick coal seams

doi: 10.19606/j.cnki.jmst.2023.02.004

1.
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo Henan 454000, China
2.
Rosedale Academy, 7030 Woodbine Avenue Suite 800 Markham, Ontario Canada L3R6G2

Received Date: 2022-05-12
Rev Recd Date: 2022-09-23
Publish Date: 2023-03-30

Abstract

Abstract

In order to clarify the law of top coal caving with continuous group caving method in extra-thick coal seams, this study investigated the influences of the caving openings width on the morphological characteristics of caving body, the evolution law of the boundary of top coal and their spatial relationship based on the discrete element numerical simulation test and theoretical analysis.The results show that when the top coal thickness is 12 m, the increase of the ratio of coal caving height to caving width (δ) would cause the increase in the eccentricity of caving body.The eccentricity of caving body tends to have a steady value when the δ value increases to a certain value.In group coal caving, the increase of caving openings width would lead to higher single caving weight and caving efficiency with increasing influence range of the boundary of top coal increases and decreasing boundary slope.The length and height of tangent section between the initial boundary of top coal and the adjacent caving body increases continuously, which benefit top-coal recovery amount.The tangency between the top-coal caving body and the boundary of top coal of the previous adjacent caving group can be used as an effective method to evaluate continuous group caving.
- extra-thick coal seam,
- top-coal group caving,
- top-coal caving body,
- the boundary of top coal,
- fully-mechanized longwall top-coal caving

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References(22)

References

[1]	王家臣, 杨胜利, 黄国君, 等. 综放开采顶煤运移跟踪仪研制与顶煤回收率测定[J]. 煤炭科学技术, 2013, 41(1): 36-39. https://www.cnki.com.cn/Article/CJFDTOTAL-MTKJ201301007.htm Wang Jiachen, Yang Shengli, Huang Guojun, et al. Research on top coal tracker of fully mechanized top coal caving mining and measurement of top coal recovery rate[J]. Coal Science and Technology, 2013, 41(1): 36-39. https://www.cnki.com.cn/Article/CJFDTOTAL-MTKJ201301007.htm
[2]	吴健. 我国放顶煤开采的理论研究与实践[J]. 煤炭学报, 1991, 16(3): 1-11. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB199103000.htm Wu Jian. Theory and practice of sub-level caving method in China[J]. Journl of China Coal Society, 1991, 16(3): 1-11. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB199103000.htm
[3]	吴健, 张勇. 关于长壁放顶煤开采基础理论的研究[J]. 中国矿业大学学报, 1998, 27(4): 331-335. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGKD804.000.htm Wu Jian, Zhang Yong. Study on the basic theory of longwall top coal caving system[J]. Journal of China University of Mining & Technology, 1998, 27(4): 331-335. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGKD804.000.htm
[4]	李荣福. 类椭球体放矿理论的理想方程[J]. 有色金属: 矿山部分, 1994, 46(5): 38-44. https://www.cnki.com.cn/Article/CJFDTOTAL-YSKU405.010.htm Li Rongfu. The ideal equation of the quasi-ellipsoid caving theory[J]. Nonferrous Metals: Mining, 1994, 46(5): 38-44. https://www.cnki.com.cn/Article/CJFDTOTAL-YSKU405.010.htm
[5]	王家臣, 张锦旺. 综放开采顶煤放出规律的BBR研究[J]. 煤炭学报, 2015, 40(3): 487-493. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201503001.htm Wang Jiachen, Zhang Jinwang. BBR study of top-coal drawing law in longwall top-coal caving mining[J]. Journal of China Coal Society, 2015, 40(3): 487-493. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201503001.htm
[6]	王家臣, 宋正阳, 张锦旺, 等. 综放开采顶煤放出体理论计算模型[J]. 煤炭学报, 2016, 41(2): 352-358. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201602011.htm Wang Jiachen, Song Zhengyang, Zhang Jinwang, et al. Theoretical model of drawing body in LTCC mining[J]. Journal of China Coal Society, 2016, 41(2): 352-358. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201602011.htm
[7]	于斌, 朱帝杰, 陈忠辉. 基于随机介质理论的综放开采顶煤放出规律[J]. 煤炭学报, 2017, 42(6): 1366-1371. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201706002.htm Yu Bin, Zhu Dijie, Chen Zhonghui. Top-coal drawing law of LTCC mining based on stochastic medium theory[J]. Journal of China Coal Society, 2017, 42(6): 1366-1371. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201706002.htm
[8]	富强, 闫少宏, 吴健. 综放开采松软顶煤落放规律的理论研究[J]. 岩石力学与工程学报, 2002, 21(4): 568-572. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX200204023.htm Fu Qiang, Yan Shaohong, Wu Jian. Theoretical research on loose top-coal drawing of longwall sublevel caving mining[J]. Chinese Journal of Rock Mechanics and Engineering, 2002, 21(4): 568-572. https://www.cnki.com.cn/Article/CJFDTOTAL-YSLX200204023.htm
[9]	黄炳香, 刘长友, 牛宏伟, 等. 大采高综放开采顶煤放出的煤矸流场特征研究[J]. 采矿与安全工程学报, 2008, 25(4): 415-419. https://www.cnki.com.cn/Article/CJFDTOTAL-KSYL200804008.htm Huang Bingxiang, Liu Changyou, Niu Hongwei, et al. Research on coal-gangue flow field character resulted from great cutting height fully mechanized top coal caving[J]. Journal of Mining & Safety Engineering, 2008, 25(4): 415-419. https://www.cnki.com.cn/Article/CJFDTOTAL-KSYL200804008.htm
[10]	王家臣, 赵兵文, 赵鹏飞, 等. 急倾斜极软厚煤层走向长壁综放开采技术研究[J]. 煤炭学报, 2017, 42(2): 286-292. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201702003.htm Wang Jiachen, Zhao Bingwen, Zhao Pengfei, et al. Research on the longwall top-coal caving mining technique in extremely inclined and soft thick coal seam[J]. Journal of China Coal Society, 2017, 42(2): 286-292. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201702003.htm
[11]	王伸, 黄贞宇, 李东印, 等. 特厚煤层分组间隔放煤顶煤运移规律研究[J]. 煤炭科学技术, 2021, 49(9): 17-24. https://www.cnki.com.cn/Article/CJFDTOTAL-MTKJ202109003.htm Wang Shen, Huang Zhenyu, Li Dongyin, et al. Study of top-coal flow mechanism under interval and multi-grouping top-coal caving technology in extra thick coal seam[J]. Coal Science and Technology, 2021, 49(9): 17-24. https://www.cnki.com.cn/Article/CJFDTOTAL-MTKJ202109003.htm
[12]	刘闯, 李化敏, 周英, 等. 综放工作面多放煤口协同放煤方法[J]. 煤炭学报, 2019, 44(9): 2632-2640. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201909003.htm Liu Chuang, Li Huamin, Zhou Ying, et al. Method of synergetic multi-windows caving in longwall top coal caving working face[J]. Journal of China Coal Society, 2019, 44(9): 2632-2640 https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201909003.htm
[13]	王家臣, 张锦旺, 陈祎. 基于BBR体系的提高综放开采顶煤采出率工艺研究[J]. 矿业科学学报, 2016, 1(1): 38-48. http://kykxxb.cumtb.edu.cn/article/id/8 Wang Jiachen, Zhang Jinwang, Chen Yi. Research on technology of improving top-coal recovery in longwall top-coal caving mining based on BBR system[J]. Journal of Mining Science and Technology, 2016, 1(1): 38-48. http://kykxxb.cumtb.edu.cn/article/id/8
[14]	杜龙飞. 塔山煤矿特厚煤层综放开采群组放煤工艺研究[D]. 北京: 煤炭科学研究总院, 2020.
[15]	张骞. 麻家梁4号煤层综放开采放煤方法优化研究[J]. 2021, 30(5): 33-34. Zhang Qian. Study on optimization of fully mechanized top-coal caving method in Majialiang the No. 4 coal seam[J]. Coal, 2021, 30(5): 33-34.
[16]	陶干强, 杨仕教, 刘振东, 等. 基于Bergmark-Roos方程的松散矿岩放矿理论研究[J]. 煤炭学报, 2010, 35(5): 750-754. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201005013.htm Tao Ganqiang, Yang Shijiao, Liu Zhendong, et al. Research of ore drawing method of broken ore and rock based on Bergmark-Roos equation[J]. Journal of China Coal Society, 2010, 35(5): 750-754. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB201005013.htm
[17]	王家臣, 富强. 低位综放开采顶煤放出的散体介质流理论与应用[J]. 煤炭学报, 2002, 27(4): 337-341. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB200204000.htm Wang Jiachen, Fu Qiang. The loose medium flow field theory and its application on the longwall top-coal caving[J]. Journal of China Coal Society, 2002, 27(4): 337-341. https://www.cnki.com.cn/Article/CJFDTOTAL-MTXB200204000.htm
[18]	刘长友, 黄炳香, 吴锋锋, 等. 综放开采顶煤破断冒放的块度理论及应用[J]. 采矿与安全工程学报, 2006, 23(1): 56-61. https://www.cnki.com.cn/Article/CJFDTOTAL-KSYL200601014.htm Liu Changyou, Huang Bingxiang, Wu Fengfeng, et al. Fragment dimension theory and its application in fully mechanized top coal caving[J]. Journal of Mining & Safety Engineering, 2006, 23(1): 56-61. https://www.cnki.com.cn/Article/CJFDTOTAL-KSYL200601014.htm
[19]	黄炳香, 刘长友, 吴锋锋, 等. 极松散细砂岩顶板下放煤工艺散体试验研究[J]. 中国矿业大学学报, 2006, 35(3): 351-355. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGKD200603012.htm Huang Bingxiang, Liu Changyou, Wu Fengfeng, et al. Experimental research on drawing top-coal with loose medium model under dead-unconsolidated sandstone roof[J]. Journal of China University of Mining & Technology, 2006, 35(3): 351-355. https://www.cnki.com.cn/Article/CJFDTOTAL-ZGKD200603012.htm
[20]	刘兴国. 崩落采矿法放矿时矿石移动的基本规律(上): 关于椭球体理论的研究[J]. 有色金属: 矿山部分, 1979, 31(4): 38-45, 26. https://www.cnki.com.cn/Article/CJFDTOTAL-YSKU197904010.htm Liu Xingguo. Ore-bearing rock movement law in sublevel caving method(1): a study on ellipsoid theory[J]. Nonferrous Metals: Mining, 1979, 31(4): 38-45, 26. https://www.cnki.com.cn/Article/CJFDTOTAL-YSKU197904010.htm
[21]	王家臣. 厚煤层开采理论与技术[M]. 北京: 冶金工业出版社, 2009.
[22]	毛市龙, 明建. 放矿理论与应用[M]. 北京: 冶金工业出版社, 2019.

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Top-coal initial caving law of continuous group caving method in extra-thick coal seams

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