Mining response and dynamic reinforcement for narrow coal pillar next to goaf in working face 1402 of Xin’an coal mine

Authors

WANG Beifang, School of Mines, Liaoning Technical University,Fuxin 123000, China; State Key Laboratory of Coal Resources and Safe Mining, Xuzhou 221008, China; State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, Beijing 100011, China
LIANG Bing, School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, China
LIU Wei, School of Civil Engineering and Transportation, Liaoning Technical University, Fuxin 123000, China
ZHANG Jing, School of Science, Liaoning Technical University, Fuxin 123000, China
CHI Haibo, School of Mines, Liaoning Technical University, Fuxin 123000, China
LIU Yahui, School of Mines, Liaoning Technical University, Fuxin 123000, China

Abstract

with the increase of integrating coal mines under national coal de-capacity policy, the mining instability phenomenon of narrow coal pillar next to goaf is increasingly prominent, which has seriously restricted the safety and efficient production in coal mines. Therefore, stability control engineering problem of narrow coal pillar next to goaf, near No.5 drilling field on air return roadway of repeated mining face 1402 in Xin'an coal mine was as study object, a method of combining numerical simulation and theoretical analysis was used to explore the mining disturbance response characteristics of narrow coal pillar stability next to goaf, near No.5 drilling field, then dynamic grouting reinforcement technical scheme for narrow coal pillar next to goaf, near No.5 drilling field was put forward and field application and effect test were carried out. The study results showed that: the stability of narrow coal pillar next to goaf, near No.5 drilling field was slightly affected by air return roadway excavating in working face 1402. While in the mining period of working face 1402, within the range of 18-6 m from No.5 drilling field, the concentrated vertical stress in narrow coal pillar next to goaf gradually transformed from asymmetrical saddle-shaped distribution into arched distribution. When working face was 6 m away from No.5 drilling field, the superimposing vertical stress in narrow coal pillar next to goaf exceeded coal strength, and the plastic zone was completely connected, which was extremely easy to failure and even destabilization. In the field, MP364 type grouting material and special grouting equipment were applied to conduct dynamic grouting reinforcement 5 m of front area and rear area in narrow coal pillar near No.5 drilling field, which was always 10 m ahead working face. Good grouting curing effect of coal pillar next to goaf was verified through the deep hole peeping and gas monitoring, and ensured the working face mined safely, provided a significant reference for similar condition of coal pillar stability control in integrating coal mines of our country.

Keywords

repeated mining face, narrow coal pillar next to goaf, stress superposition, dynamic grouting, reinforcement detecting, Xin’an coal mine

DOI

10.3969/j.issn.10011986.2020.01.019

Recommended Citation

WANG Beifang, LIANG Bing, LIU Wei, et al. (2020) "Mining response and dynamic reinforcement for narrow coal pillar next to goaf in working face 1402 of Xin’an coal mine," Coal Geology & Exploration: Vol. 48: Iss. 1, Article 20.
DOI: 10.3969/j.issn.10011986.2020.01.019
Available at: https://cge.researchcommons.org/journal/vol48/iss1/20

Reference

[1] 张炜,张东升,陈建本,等. 孤岛工作面窄煤柱沿空掘巷围岩变形控制[J]. 中国矿业大学学报,2014,43(1):36-42. ZHANG Wei,ZHANG Dongsheng,CHEN Jianben,et al. Control of surrounding rock deformation for gob-side entry driving in narrow coal pillar of island coalface[J]. Journal of China University of Mining & Technology,2014,43(1):36-42.

[2] 荆升国,谢文兵,赵晨光. 孤岛综放工作面沿空掘巷围岩变形因素研究[J]. 煤炭科学技术,2008,35(5):68-72. JING Shengguo,XIE Wenbing,ZHAO Chenguang. Research on surrounding rock deformation factors in gob-side entry driving of fully mechanized longwall top coal caving mining face in island seam[J]. Coal Science and Technology,2008,35(5):68-72.

[3] 陈新忠,王猛. 深部倾斜煤层沿空掘巷围岩变形特征与控制技术研究[J]. 采矿与安全工程学报,2015,32(3):485-490. CHEN Xinzhong,WANG Meng. Research on surrounding rock deformation characteristics of gob-side entry driving in deep inclined coal seam and its control technology[J]. Journal of Mining & Safety Engineering,2015,32(3):485-490.

[4] 王猛,柏建彪,王襄禹,等. 深部倾斜煤层沿空掘巷上覆结构稳定与控制研究[J]. 采矿与安全工程学报,2015,32(3):426-432. WANG Meng,BAI Jianbiao,WANG Xiangyu,et al. Stability and control technology of overlying structure in gob-side entry driving roadways of deep inclined coal seam[J]. Journal of Mining & Safety Engineering,2015,32(3):426-432.

[5] 魏臻,何富连,张广超,等. 大断面综放沿空煤巷顶板破坏机制与锚索桁架控制[J]. 采矿与安全工程学报,2017,34(1):1-8. WEI Zhen,HE Fulian,ZHANG Guangchao,et al. Failure mechanism and cable truss control of large-scale section gob-side entry roof with fully-mechanized caving[J]. Journal of Mining & Safety Engineering,2017,34(1):1-8.

[6] 王德超,王琦,李术才,等. 深井综放沿空掘巷围岩变形破坏机制及控制对策[J]. 采矿与安全工程学报,2014,31(5):665-673. WANG Dechao,WANG Qi,LI Shucai,et al. Mechanism of rock deformation and failure and its control technology of roadway driving along next goaf in fully mechanized top coal caving face of deep mines[J]. Journal of Mining & Safety Engineering,2014,31(5):665-673.

[7] 王卫军,侯朝炯. 沿空巷道底鼓力学原理及控制技术的研究[J]. 岩石力学与工程学报,2004,23(1):69-74. WANG Weijun,HOU Chaojiong. Study on mechanical principle and control technique of floor heave in roadway driven along next goaf[J]. Chinese Journal of Rock Mechanics and Engineering,2004,23(1):69-74.

[8] 王卫军,侯朝炯,柏建彪,等. 综放沿空巷道底板受力变形分析及底鼓力学原理[J]. 岩土力学,2001,22(3):319-322. WANG Weijun,HOU Chaojiong,BAI Jianbiao,et al. Mechanical deformation analysis and principle of floor heave of roadway driving gob in fully mechanized sub-level caving face[J]. Rock and Soil Mechanics,2001,22(3):319-322.

[9] 马振乾,姜耀东,宋红华,等. 构造破碎区沿空掘巷偏应力分布特征与控制技术[J]. 采矿与安全工程学报,2017,34(1):24-31. MA Zhenqian,JIANG Yaodong,SONG Honghua,et al. Distribution characteristics of deviatoric stress and control technology of gob-side entry driving in structure fracture zone[J]. Journal of Mining & Safety Engineering,2017,34(1):24-31.

[10] 李学华,梁顺,姚强岭,等. 冲击倾向性围岩沿空掘巷防冲控制原理及应用[J]. 采矿与安全工程学报,2012,29(6):751-756. LI Xuehua,LIANG Shun,YAO Qiangling,et al. Control principle and its application of rock burst in roadway driving along goaf with outburst-proneness surrounding rocks[J]. Journal of Mining & Safety Engineering,2012,29(6):751-756.

[11] 马元,靖洪文,陈玉桦. 动压巷道围岩破坏机理及支护的数值模拟[J]. 采矿与安全工程学报,2007,24(1):109-113. MA Yuan,JING Hongwen,CHEN Yuhua. Numerical simulation of failure mechanism of surrounding rocks in mining induced roadway and its support[J]. Journal of Mining & Safety Engineering,2007,24(1):109-113.

[12] 张农,李学华,高明仕. 迎采动工作面沿空掘巷预拉力支护及工程应用[J]. 岩石力学与工程学报,2004,23(12):2100-2105. ZHANG Nong,LI Xuehua,GAO Mingshi. Pretensioned support of roadway driven along next gob and heading adjacent advancing coal face and its application[J]. Chinese Journal of Rock Mechanics and Engineering,2004,23(12):2100-2105.

[13] 陈育民,徐鼎平. FLAC/FLAC^3D基础与工程实例[M]. 北京:中国水利水电出版社,2009. CHEN Yumin,XU Dingping. FLAC/FLAC^3D foundation and engineering examples[M]. Beijing:China Water & Power Press,2009.

[14] 孙四清,郑凯歌. 井下高压水射流切割煤层增透效果数值模拟[J]. 煤田地质与勘探,2017,45(2):45-49. SUN Siqing,ZHENG Kaige. Numerical simulation study on permeability enhancement effect of high pressure water cutting coal seam[J]. Coal Geology & Exploration,2017,45(2):45-49.

[15] 夏龙. 窄煤柱注浆加固可行性研究[J]. 煤炭技术,2016,35(4):27-28. XIA Long. Study on feasibility of grouting reinforcement in narrow coal pillar[J]. Coal Technology,2016,35(4):27-28.

[16] 郭盛彬,杨高峰,李俊杰,等. 马兰煤矿主斜井底水仓底板加固防治水方法[J]. 煤田地质与勘探,2017,45(1):90-94. GUO Shengbin,YANG Gaofeng,LI Junjie,et al. The main slope bottom water warehouse floor reinforcement methods research of Malan coal mine[J]. Coal Geology & Exploration,2017,45(1):90-94.

[17] 王汉鹏,高延法,李术才. 岩石峰后注浆加固前后力学特性单轴试验研究[J]. 地下空间与工程学报,2007,3(1):27-31. WANG Hanpeng,GAO Yanfa,LI Shucai. Uniaxial experiment study on mechanical properties of reinforced broken rocks pre-and-post grouting[J]. Chinese Journal of Underground Space and Engineering,2007,3(1):27-31.

[18] 钱鸣高,石平五,许家林. 矿山压力与岩层控制[M]. 徐州:中国矿业大学出版社,2010. QIAN Minggao,SHI Pingwu,XU Jialin. Mining pressure and strata control[M]. Xuzhou:China University of Mining and Technology Press,2010.

[19] 冯志强. 破碎煤岩体化学注浆加固材料研制及渗透扩散特性研究[D]. 北京:煤炭科学研究总院,2007. FENG Zhiqiang. Material development and research of osmosis and diffusion on chemical grouting for extraordinary cracked coal and rockmass[D]. Beijing:China Coal Research Institute,2007.

[20] 康红普,王金华. 煤巷锚杆支护理论与成套技术[M]. 北京:煤炭工业出版社,2007. KANG Hongpu,WANG Jinhua. Rock bolting theory and complete technology for coal roadways[M]. Beijing:China Coal Industry Publishing House,2007.

[21] 中安华邦(北京)安全生产技术研究院. 煤矿安全规程解读与实施(地下矿)[M]. 徐州:中国矿业大学出版社,2016. Zhong'an Huabang(Beijing) Safety Production Technology Research Institute. Interpretation and implementation for safety regulations of coal mine(underground mining)[M]. Xuzhou:China University of Mining and Technology Press,2016.