Microseismic test and numerical simulation analysis of floor failure depth of isolated coal mining face

Authors

ZHAO Chunhu, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China; Shaanxi Key Laboratory of Coal Mine Water Hazard Control, Xi'an 710077, China

Abstract

Aiming at the damage of coal seam floor caused by mining in isolated coal mining face, taking 11913 isolated coal mining face in Gequan coal mine of Hebei Province as the research object, and using KJ959 coal mine microseismic monitoring system to detect the floor failure depth. It is recognized that the microseismic events mainly occur in the roadway of the isolated coal mining face during the mining process, and the maximum vertical failure depth is about 20~25m; Moreover, using the COMSOL multi-physical field numerical simulation platform, the variation of in-situ stress and failure law of coal seam floor under the conditions of 11912 first coal mining face, 11914 jumping coal mining face and 11913 isolated coal mining face are analyzed. The simulation results show that the in-situ stress concentration state of coal pillars under the conditions of 11912 first mining face or 11914 jumping mining face has little change, and the maximum failure depth is less than 11.56 m, which only develops into the interior of grouting reformation layer. Under the condition of 11913 isolated mining face, the in-situ stress concentration state of coal pillars on both sides of mining face increases sharply due to the influence of repeated mining in mining faces 11912 and 11914, and the maximum failure depth increases to 23 m, which has extended to Benxi limestone aquifer of coal seam floor. The conclusion has certain reference value for the study of floor failure law of North China type coalfield and the selection of grouting transformation horizon under different mining conditions.

Keywords

isolated coal mining face, failure depth, repeated mining, microseismic numerical simulation, Gequan coal mine, Xingtai of Hebei

DOI

10.3969/j.issn.1001-1986.2019.04.017

Recommended Citation

Z. (2019) "Microseismic test and numerical simulation analysis of floor failure depth of isolated coal mining face," Coal Geology & Exploration: Vol. 47: Iss. 4, Article 18.
DOI: 10.3969/j.issn.1001-1986.2019.04.017
Available at: https://cge.researchcommons.org/journal/vol47/iss4/18

Reference

[1] 宋振骐,蒋宇静,杨增夫,等. 煤矿重大事故预测和控制的动力信息基础研究[M]. 北京:煤炭工业出版社,2003.

[2] 张蕊,姜振泉,于宗仁,等. 煤层底板采动破坏特征综合测试及数值模拟研究[J]. 采矿与安全工程学报,2013,30(4):531-537. ZHANG Rui,JIANG Zhenquan,YU Zongren,et al. Comprehensive testing and numerical analysis on the failure characteristics of mining coal seam floor[J]. Journal of Mining & Safety Engineering,2013,30(4):531-537.

[3] 施龙青,徐东晶,邱梅,等. 采场底板破坏深度计算公式的改进[J]. 煤炭学报,2013,38(增刊2):299-303. SHI Longqing,XU Dongjing,QIU Mei,et al. Improved on the formula about the depth of damaged floor in working area[J]. Journal of China Coal Society,2013,38(S2):299-303.

[4] 李七明,翟立娟,傅耀军,等. 华北型煤田煤层开采对含水层的破坏模式研究[J]. 中国煤炭地质,2012,24(7):38-43. LI Qiming,ZHAI Lijuan,FU Yaojun,et al. A study on coal mining aquifer destruction mode in North China typed coal-fields[J]. Coal Geology of China,2012,24(7):38-43

[5] 程学丰,刘盛东,刘登宪. 煤层采后围岩破坏规律的声波CT探测[J]. 煤炭学报,2001,26(2):153-155. CHENG Xuefeng,LIU Shengdong,LIU Dengxian. Sound-wave CT detection for failure patterns of surrounding rock after mining[J]. Journal of China Coal Society,2001,26(2):153-155.

[6] 施龙青,朱鲁,韩进,等. 矿山压力对底板破坏深度监测研究[J]. 煤田地质与勘探,2004,32(6):20-23. SHI Longqing,ZHU Lu,HAN Jin,et al. Monitor study on broken floor depth caused by underground pressure[J]. Coal Geology & Exploration,2004,32(6):20-23.

[7] 陈继刚,熊祖强,李卉,等. 倾斜特厚煤层综放带压开采底板破坏特征研究[J]. 岩石力学与工程学报,2016,35(增刊1):3018-3023. CHEN Jigang,XIONG Zuqiang,LI Hui,et al. Failure characteristics of floor under predssure inclined and extra thick coal seam in full-mechanized top coal caving faces[J]. Chinese Journal of Rock Mechanics and Engineering,2016,35(S1):3018-3023.

[8] 程久龙,于师建,宋扬,等. 煤层底板破坏深度的声波CT探测试验研究[J]. 煤炭学报,1999,24(6):576-580. CHENG Jiulong,YU Shijian,SONG Yang,et al. Detection of failure depth of coal seam floor by acoustic wave computer tomography[J]. Journal of China Coal Society,1999,24(6):576-580.

[9] 张朋,王一,刘盛东,等. 工作面底板变形与破坏电阻率特征[J]. 煤田地质与勘探,2011,39(1):64-67. ZHANG Peng,WANG Yi,LIU Shengdong,et al. Resistivity characteristic of deformation and failure of floor in work-face[J]. Coal Geology & Exploration,2011,39(1):64-67.

[10] 李书奎,张连福,张少峰,等. 微震监测技术在煤层底板突水防治中的应用[J]. 煤矿开采,2011,16(5):94-96. LI Shukui,ZHANG Lianfu,ZHANG Shaofeng,et al. Application of micro-seismic monitoring technology in floor water-burst prevention[J]. Coal Mining Technology,2011,16(5):94-96.

[11] 尹贤刚. 试论基于微震监测技术研究大尺度岩体破坏机理的必要性及意义[J]. 矿业研究与开发,2013,33(6):31-33. YIN Xiangang. Discuss of the significance and necessity of studying on the failure mechanism of large-scale rock mass based on micro-seismic monitoring technology[J]. Mining Research & Development,2013,33(6):31-33.

[12] 姜福兴,叶根喜,王存文,等. 高精度微震监测技术在煤矿突水监测中的应用[J]. 岩石力学与工程学报,2008,27(9):1932-1938. JIANG Fuxing,YE Genxi,WANG Cunwen,et al. Appli-cation of high-precision microseismic monitoring technique to water inrush monitoring in coal mine[J]. Chinese Journal of Rock Mechanics and Engineering,2008,27(9):1932-1938.

[13] 孙运江,左建平,李玉宝,等. 邢东矿深部带压开采导水裂隙带微震监测及突水机制分析[J]. 岩土力学,2017,38(8):2335-2342. SUN Yunjiang,ZUO Jianping,LI Yubao,et al. Micro-seismic monitoring on fractured zone and water inrush mechanism analysis of deep mining above aquifer in Xingdong coalmine[J]. Rock and Soil Mechanics,2017,38(8):2335-2342.

[14] 程爱平,高永涛,梁兴旺,等. 基于未确知聚类法的底板采动破坏深度动态预测[J]. 采矿与安全工程学报,2014,31(5):739-744. CHENG Aiping,GAO Yongtao,LIANG Xingwang,et al. Dynamic forecasting of mining-induced failure depth of floor based on unascertained clustering method[J]. Journal of Mining and Safety Engineering,2014,31(5):739-744.

[15] 林远东,涂敏. 采场端部底板破坏深度解析分析[J]. 煤炭科学技术,2011,39(3):25-28. LIN Yuandong,TU Min. Resolution and analysis on failure depth of face end floor in coal mining face[J]. Coal Science and Technology,2011,39(3):25-28.

[16] 李昂,谷拴成,陈方方. 带压开采煤层底板破坏深度理论分析及数值模拟:以陕西澄合矿区董家河煤矿5号煤层为例[J]. 煤田地质与勘探,2013,41(4):56-60. LI Ang,GU Shuancheng,CHEN Fangfang. Theoretical analysis and numerical simulation of destroyed depth of coal seam floor during bearing mining:With seam No.5 in Dongjiahe mine,Chenghe mining area,Shaanxi as exam-ple[J]. Coal Geology & Exploration,2013,41(4):56-60.

[17] 刘毅,秦鸿刚. 基于微震监测技术的巷道底板监测准确性研究[J]. 煤炭技术,2017,36(2):49-51. LIU Yi,QIN Honggang. Study of floor monitoring accuracy based on microseismic monitoring technology[J]. Coal Technology,2017,36(2):49-51.

[18] 孙建,王连国,唐芙蓉,等. 倾斜煤层底板破坏特征的微震监测[J]. 岩土力学,2011,32(5):1589-1595. SUN Jian,WANG Lianguo,TANG Furong,et al. Microseismic monitoring failure characteristics of inclined coal seam floor[J]. Rock and Soil Mechanics,2011,32(5):1589-1595.

[19] 王连国,韩猛,王占盛,等. 采场底板应力分布与破坏规律研究[J]. 采矿与安全工程学报,2013,30(3):317-322. WANG Lianguo,HAN Meng,WANG Zhansheng,et al. Stress distribution and damage law of mining floor[J]. Journal of Mining & Safety Engineering,2013,30(3):317-322.

[20] 朱术云,周海洋,李新芳,等. 基于现场实测"三软"煤层采动底板变形破坏机制[J]. 采矿与安全工程学报,2013,30(4):518-525. ZHU Shuyun,ZHOU Haiyang,LI Xinfang,et al. Defor-mation and failure mechanism of mining floor in "three-soft" coal seam based on field measurement[J]. Journal of Mining and Safety Engineering,2013,30(4):518-525.

[21] 刘德君. 采空区的围岩应力分布及其与底板突水的关系[J]. 煤矿安全,1988(7):35-39. LIU Dejun. The stress distribution of the goaf and its rela-tionship of water inrush[J]. Safety in Coal Mines,1988(7):35-39.

[22] 鲁海峰,姚多喜. 采动底板层状岩体应力分布规律及破坏深度研究[J]. 岩石力学与工程学报,2014,33(10):2030-2039. LU Haifeng,YAO Duoxi. Stress distribution and failure depths of layered rock mass of mining floor[J]. Chinese Journal of Rock Mechanics and Engineering,2014,33(10):2030-2039.

[23] 徐玉增. 葛泉矿带压开采下组煤底板破坏深度探测研究[J]. 中国煤炭,2010,36(4):48-51. XU Yuzeng. A study on the depth of floor damage in lower coal seam mining with water pressure in Gequan coal mine[J]. China Coal,2010,36(4):48-51.

[24] 白峰青,李冲,徐玉增,等. 葛泉矿带压开采9号煤底板突水危险性分析[J]. 煤矿安全,2010,41(6):106-108. BAI Fengqing,LI Chong,XU Yuzeng,et al. Analysis of water inrush risk when mining 9# floor under pressure in Gequan coal mine[J]. Safety in Coal Mines,2010,41(6):106-108.