Formation mechanism of coal seam aquifer and water hazard control technology

Authors

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

Abstract

Coal seams occur in Peat formation formed by sediments, often used as aquiclude or aquitard in coal production. However, in Barapukuria coal mine in Bangladesh, No.VI coal seam is rich in water, shows a typical hydrogeological phenomenon that the coal seam becomes an aquifer, which is rare in coal mining process both in China and abroad. From the formation mechanism of coal and the microstructure and tectonic development characteristics of coal, the structure of rich in water of coal was revealed. Based on MTS815 rock mechanics test system, the permeability of No.VI coal was tested, and the internal structure of coal seam was revealed. Through the permeability analysis of roof and floor, combined with hydrogeological tests, the hydrogeological concept model of thick coal seam water storage structure was analyzed. Hydraulic connectivity test was applied to identify the main source of water supply in thick coal seam. The formation mechanism of thick coal seam as an aquifer was revealed by the three key factors, which are the structure of the coal body, the water storage structure and the recharge water source. The study shows, coalification of organic matter and the formation stress make a effective pores and water cracks development in coal body, in case of better supply conditions and meeting the geological structure of the aquifer, the coal seam can form an aquifer. Aiming at the characteristics of coal seam water, put forward the technical system for groundwater prevention and control in thick coal seam, which provides technical support for the area of coal seam as the aquifer.

Keywords

thick coal seam, coal seam aquifer, formation mechanism, water hazard prevention and control

DOI

10.3969/j.issn.1001-1986.2019.03.019

Recommended Citation

W. (2019) "Formation mechanism of coal seam aquifer and water hazard control technology," Coal Geology & Exploration: Vol. 47: Iss. 3, Article 20.
DOI: 10.3969/j.issn.1001-1986.2019.03.019
Available at: https://cge.researchcommons.org/journal/vol47/iss3/20

Reference

[1] 杨起,韩德馨. 中国煤田地质学[M]. 北京:煤炭工业出版社,1979:261-268.

[2] 郑世书,陈江中,刘汉湖,等. 专门水文地质学[M]. 徐州:中国矿业大学出版社,1999:96-103.

[3] 李海龙,白海波,钱宏伟,等. 含水煤层底板岩层力学性质分析:以小纪汗煤矿为例[J]. 采矿与安全工程学报,2016,33(3):501-508. LI Hailong,BAI Haibo,QIAN Hongwei,et al. Mechanical behavior investigation for floor rock stratum in the water-rich coal seam[J]. Journal of Mining & Safety Engineering,2016,33(3):501-508.

[4] 李顺才,李强,缪协兴,等. 小纪汗井田地层介质渗透特性及煤层为主含水层成因机制[J]. 煤炭学报,2017,42(2):353-359. LI Shuncai,LI Qiang,MIAO Xiexing,et al. Experimental study on permeability properties of stratum medium of Xiaojihan coal mine and genetic mechanism of the coal seam becoming a main aquifer[J]. Journal of China Coal Society,2017,42(2):353-359.

[5] 赵洪宝,胡桂林,王飞虎,等. 局部荷载下含中心孔洞煤体裂纹扩展特征量化分析[J]. 煤炭学报,2017,42(4):860-870. ZHAO Hongbao,HU Guilin,WANG Feihu,et al. Quantitative analysis of crack expansion in specimens of coal having a single pre-existing hole[J]. Journal of China Coal Society,2017,42(4):860-870.

[6] 尹光志,李文璞,李铭辉,等. 加卸载条件下原煤渗透率与有效应力的规律[J]. 煤炭学报,2014,39(8):1497-1503. YIN Guangzhi,LI Wenpu,LI Minghui,et al. Permeability properties and effective stress of raw coal under load-ing-unloading conditions[J]. Journal of China Coal Society,2014,39(8):1497-1503.

[7] 许江,袁梅,李波波,等. 煤的变质程度、孔隙特征与渗透率关系的试验研究[J]. 岩石力学与工程学报,2012,31(4):681-687. XU Jiang,YUAN Mei,LI Bobo,et al. Experimental study of relationships between metamorphic grade, pore characteristics and permeability of coal[J]. Chinese Journal of Rock Mechanics and Engineering,2012,31(4):681-687.

[8] 姚强岭,李学华,瞿群迪. 富水煤层巷道顶板失稳机理与围岩控制技术[J]. 煤炭学报,2011,36(1):12-17. YAO Qiangling,LI Xuehua,QU Qundi. Instability mechanism and technique of surrounding rock control of water-enriched roofs of coal drifts[J]. Journal of China Coal Society,2011,36(1):12-17.

[9] 马亚杰,左文喆,刘伯,等. 隐伏向斜扬起端构造控水规律分析:以开滦东欢坨矿为例[J]. 煤炭学报,2012,37(增刊1):157-160. MA Yajie,ZUO Wenzhe,LIU Bo,et al. Analysis on law of geological structures controlling groundwater in buried syncline nose:A case in the Donghuantuo coal mine,Kailuan[J]. Journal of China Coal Society,2012,37(S1):157-160.

[10] 靳德武. 我国煤矿水害防治技术新进展及其方法论思考[J]. 煤炭科学技术,2017,45(5):141-147. JIN Dewu. New development of water disaster prevention and control technology in China coal mine and consideration on methodology[J]. Coal Science and Technology,2017,45(5):141-147.