厚松散层下三软煤层开采覆岩导水裂隙发育规律

doi:10.13722/j.cnki.jrme.2021.0210

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Abstract In order to grasp the law of overlying strata movement and water-conducting fracture development in three-soft coal seam mining under thick loose layers. Taking Chenghe mining area as the background，using the similarity simulation experiment，comprehensively using the research method of the total station monitoring，high-definition borehole TV monitoring，3DEC software and SPSS professional statistical analysis software，and introducing the mining damage theory，the overburden migration law，fracture development and evolution，and distribution characteristics of water-conducting fracture zone were studied under this condition. The results show that the Overburden migration presents asymmetry，the subsidence extreme value of rock strata in different layers always deviates to the side of open-off cut，and the movement range of the loose layer is larger than that of the top layer of the bedrock，showing a“hyperbolic-like”shape as a whole. According to the theoretical formula，the fracture angle of the bedrock is relatively small，ranging from 56° to 58°. The height of the caving zone and the caving-mining ratio are 13.75 m and 3.06 respectively，and the height of the water-conducting fracture zone and the fracture-mining ratio are 75 m and 16.67 respectively. The number of fractures gradually increases from the surface to the bottom and suddenly increases in the water-conducting fracture zone. The development of fissures is controlled by the mining stress field in the 33° east by north direction. The evolution of the water-conducting fracture zone presents five stages which are“slow development，gradual increase，large and sudden increase，periodic small increase and stable development”. Through 3DEC simulation，it is concluded that the height of water-conducting fracture zone has an exponential function relationship with the thickness of loose layer，a linear relationship with mining height，and a logarithmic function relationship with buried depth and inclined length of working face. Using SPSS professional statistical analysis software，the empirical formula for predicting the height of the water-conducting fractured zone is fitted based on the multiple nonlinear regression theory. By comparing the calculation results，the rationality of the regression empirical equation in predicting the height of the water-conducting fracture zone is verified. Because the K5 sandstone aquifer has a large unit water inflow and is close to the coal seam. In order to avoid the mining of the coal seam from being affected by the overburden K5 sandstone aquifer. According to the obtained prediction empirical formula，the maximum mining height of the coal seam should not surpass 3.8 m. This research has important reference value for water-conservation mining in coal mine under similar geological conditions.

Key words： mining enginering thick loose layer three soft coal seam asymmetry development of water- conducting fracture multiple nonlinear regression

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	LAI Xingping1
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	ZHANG Xudong1
	SHAN Pengfei1
	2
	3
	CUI Feng1
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	LIU Bowei1
	BAI Rui1

Cite this article:

LAI Xingping1,2,3, et al. Study on development law of water-conducting fractures in overlying strata of three soft coal seam mining under thick loose layers[J]. , 2021, 40(9): 1739-1750.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0210 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I9/1739

[1] 范立民，孙魁，李成，等. 西北大型煤炭基地地下水监测背景、思路及方法[J]. 煤炭学报，2020，45(1)：317–329.(FAN Limin，SUN Kui，LI Cheng，et al. Background，thought and method of groundwater monitoring in large coal base of northwest China[J]. Journal of China Coal Society，2020，45(1)：317–329.(in Chinese))
[2] 范立民. 保水采煤面临的科学问题[J]. 煤炭学报，2019，44(3)：667–674.(FAN Limin. Some scientific issues in water-preserved coal mining[J]. Journal of China Coal Society，2019，44(3)：667–674.(in Chinese))
[3] 王双明，黄庆享，范立民，等. 生态脆弱矿区含(隔)水层特征及保水开采分区研究[J]. 煤炭学报，2010，35(1)：7–14.(WANG Shuangming，HUANG Qingxiang，FAN Limin，et al. Study on overburden aquclude and water protection mining regionazation in the ecological fragile mining area[J]. Journal of China Coal Society，2010，35(1)：7–14.(in Chinese))
[4] 周宏伟，张涛，薛东杰，等. 长壁工作面覆岩采动裂隙网络演化特征[J]. 煤炭学报，2011，36(12)：1 957–1 962.(ZHOU Hongwei，ZHANG Tao，XUE Dongjie，et al. Evolution of mining-induced crack network in over burden strata of longwall face[J]. Journal of China Coal Society，2011，36(12)：1 957–1 962.(in Chinese))
[5] 左建平，孙运江，王金涛，等. 充分采动覆岩“类双曲线”破坏移动机制及模拟分析[J]. 采矿与安全工程学报，2018，35(1)：71–77.(ZUO Jianping，SUN Yunjiang，WANG Jintao，et al. Mechanical and numerical analysis of “analogous hyperbola”movement of overlying strata after full mining extraction[J]. Journal of Mining and Safety Engineering，2018，35(1)：71–77.(in Chinese))
[6] 来兴平，崔峰，曹建涛，等. 三软煤层综放工作面覆岩垮落及裂隙导水特征分析[J]. 煤炭学报，2017，42(1)：148–154.(LAI Xingping，CUI Feng，CAO Jiantao，et al. Analysis on characteristics of overlying rock caving and fissure conductive water in top-caol caving working face at three soft coal seam[J]. Journal of China Coal Society，2017，42(1)：148–154.(in Chinese))
[7] 张升，张吉雄，闫浩，等. 极近距离煤层固体充填充实率协同控制覆岩运移规律研究[J]. 采矿与安全工程学报，2019，36(4)：712–718.(ZHANG Sheng，ZHANG Jixiong，YAN Hao，et al. Overlying strata movement coordinated with the compression ratio of backfilling solid in ultra-close coal seams[J]. Journal of Mining and Safety Engineering，2019，36(4)：712–718.(in Chinese))
[8] WANG G，WU M，WANG R，et al. Height of the mining-induced fractured zone above a coal face[J]. Engineering Geology，2017，216：140–152.
[9] 殷伟，张强，韩晓乐，等. 混合综采工作面覆岩运移规律及空间结构特征分析[J]. 煤炭学报，2017，42(2)：388–396.(YIN Wei，ZHANG Qiang，HAN Xiaole，et al. Overlying strata movement law and spatial structure analysis of fully mechanized mixed mining of backfilling and caving[J]. Journal of China Coal Society，2017，42(2)：388–396.(in Chinese))
[10] 薛建坤，王皓，赵春虎，等. 鄂尔多斯盆地侏罗系煤田导水裂隙带高度预测[J]. 采矿与安全工程学报，2020，37(6)：1 222–1 230. (XUE Jiankun，WANG Hao，ZHAO Chunhu，et al. Prediction of the height of water-conducting fracture zone and water-filling model of roof aquifer in Jurassic coalfield in Ordos Basin[J]. Journal of Mining and Safety Engineering，2020，37(6)：1 222–1 230.(in Chinese))
[11] 伍永平，皇甫靖宇，罗生虎，等. 大倾角近距离煤层开采覆岩运移及顶板破坏特征[J]. 西安科技大学学报，2020，40(1)：1–10.(WU Yongping，HUANGFU Jingyu，LUO Shenghu，et al. Model experiment and analysis on failure evolution characteristics of mining overburden strata[J]. Journal of Xi¢an University of Science and Technology，2020，40(1)：1–10.(in Chinese))
[12] 徐祝贺，李全生，李晓斌，等. 浅埋高强度开采覆岩结构演化及地表损伤研究[J]. 煤炭学报，2020，45(8)：2 728–2 739.(XU Zhuhe，LI Quansheng，LI Xiaobin，et al. Structural evolution of overburden and surface damage caused by high-intensity mining with shallow depth[J]. Journal of China Coal Society，2020，45(8)：2 728–2 739.(in Chinese))
[13] 杨达明，郭文兵，赵高博，等. 厚松散层软弱覆岩下综放开采导水裂隙带发育高度[J]. 煤炭学报，2019，44(11)：3 308–3 316.(YANG Daming，GUO Wenbing，ZHAO Gaobo，et al. Height of water-conducting zone in longwall top-coal caving mining under thick alluvium and soft overburden[J]. Journal of China Coal Society，2019，44(11)：3 308–3 316.(in Chinese))
[14] 程香港，乔伟，李路，等. 煤层覆岩采动裂隙应力–渗流耦合模型及涌水量预测[J]. 煤炭学报，2020，45(8)：2 890–2 900. (CHENG Xianggang，QIAO Wei，LI Lu，et al. Model of mining-induced fracture stress-seepage coupling in coal seam over-burden and prediction of mine inflow[J]. Journal of China Coal Society，2020，45(8)：2 890–2 900.(in Chinese))
[15] YE Q，WANG G，JIA Z Z，et al. Similarity simulation of mining-crack-evolution characteristics of overburden strata in deep coal mining with large dip[J]. Journal of Petroleum Science and Engineering，2018，165：477–487.
[16] CHEN Y，ZHU S. Determination of caved and water-conducting fractured zones of “two soft and one hard”unstable coal seam[J]. Acta Geodaetica et Geophysica.2020，55(3)：451–475.
[17] HEBBLEWHITE B. Fracturing，caving propagation and influence of mining on groundwater above longwall panels—a review of predictive models[J]. International Journal of Mining Science and Technology，2020，30(Supp.1)：49–54.
[18] 纪洪广，向鹏，张磊，等. 开采扰动岩体力学性质变异试验研究与探测分析[J]. 岩石力学与工程学报，2011，30(11)：2 352–2 359. (JI Hongguang，XIANG Peng，ZHANG Lei，et al. Experimental study and detection analysis of mechanical properties variability of rock mass in excavation disturbance[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(11)：2 352–2 359.(in Chinese))
[19] 王金华，黄志增，于雷. 特厚煤层综放开采顶煤体“三带”放煤理论与应用[J]. 煤炭学报，2017，42(4)：809–816.(WANG Jinhua，HUANG Zhizeng，YU Lei.“Three plies in top coal”theory and its application in top coal caving mining for ultra-thick coal seams[J]. Journal of China Coal Society，2017，42(4)：809–816.(in Chinese))
[20] 黄庆享，赖锦琪. 条带充填保水开采隔水岩组力学模型研究[J]. 采矿与安全工程学报，2016，33(4)：592–596.(HUANG Qingxiang，LAI Jinqi.Study on mechanical model of aquifuge beam supported by filling strip in the water preserved mining[J]. Journal of Mining and Safety Engineering，2016，33(4)：592–596.(in Chinese))
[21] 张东升，李文平，来兴平，等. 我国西北煤炭开采中的水资源保护基础理论研究进展[J]. 煤炭学报，2017，42(1)：36–43.(ZHANG Dongsheng，LI Wenping，LAI Xingping，et al. Development on basic theory of water protection during coal mining in northwest of China[J]. Journal of China Coal Society，2017，42(1)：36–43.(in Chinese))
[22] 李超峰，虎维岳，王云宏，等. 煤层顶板导水裂缝带高度综合探查技术[J]. 煤田地质与勘探，2018，46(1)：101–107.(LI Chaofeng，HU Weiyue，WANG Yunhong，et al. Comprehensive detection technique for coal seam roof water flowing fractured zone height[J]. Coal Geology and Exploration，2018，46(1)：101–107.(in Chinese))
[23] WEN Z J，JING S L，JIANG Y J，et al. Study of the fracture law of overlying strata under water based on the flow-stress-damage model[J]. Geofluids，2019，https：//doi.org/10.1155/2019/3161852.
[24] YANG W F，XIA X H. Study on mining failure law of the weak and weathered composite roof in a thin bedrock working face[J]. Journal of Geophysics and Engineering，2018，15(6)：2 370–2 377.
[25] LAI X，XU H，FAN J，et al. Study on the mechanism and control of rock burst of 2 coal pillar under complex conditions[J]. Geofluids，2020，https：//doi.org/10.1155/2020/8847003.
[26] 李鸿昌. 矿山压力的相似模拟试验[M]. 徐州：中国矿业大学出版社，1988：67–68.(LI Hongchang. Similar simulation test of mine pressure[M]. Xuzhou：China University of mining and Technology Press，1988：67–68.(in Chinese))
[27] 何浩宇，石露，李小春，等. 基于新型茂木式试验机的真三轴试验及加载边界效应研究[J]. 岩石力学与工程学报，2015，34(增1)：2 837–2 844.(HE Haoyu，SHI Lu，LI Xiaochun，et al. True triaxial tests with mogi-type true triaxial test apparatus and its loading boundary effect[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(Supp.1)：2 837–2 844.(in Chinese))
[28] 代张音，唐建新，王艳磊，等. 顺层岩质斜坡开采沉陷预测模型研究[J]. 岩石力学与工程学报，2017，36(12)：3 012–3 020.(DAI Zhangyin，TANG Jianxin，WANG Yanlei，et al. A model for predicting mining subsidence in bedding rock slopes[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(12)：3 012–3 020.(in Chinese))
[29] 王磊，张鲜妮. 基于单视线向D-InSAR技术提取开采沉陷移动与变形方法研究[J]. 岩石力学与工程学报，2017，36(4)：865–873. (WANG Lei，ZHANG Xianni. Retrieving surface movement and deformation induced by coal mining based on a single D-InSAR pair[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(4)：865–873.(in Chinese))
[30] 国家煤炭工业局. 建筑物、水体、铁路及主要井巷煤柱留设与压煤开采规程[M]. 北京：煤炭工业出版社，2000：55–56.(State Bureau of Coal Industry. Regulations of buildings，water，rail way and main well lane leaving coal pillar and press coal minin[M]. Beijing：China Coal Industry Publishing House，2000：55–56.(in Chinese))