Citation: | LIN Haifei,WANG Xu,XU Peiyun,et al. Evolution characteristics analysis and engineering application of pressure-relieved gas reservoir in extra-thick coal seam mining[J]. Coal Science and Technology,2023,51(2):173−182. DOI: 10.13199/j.cnki.cst.2020–1291 |
In order to study the dynamic evolution law of the pressure relief gas reservoir in the mining of extra-thick coal seams, the 3DEC numerical simulation software was used to analyze the stress and displacement distribution law of the overburden rock caused by mining, and the evolution characteristics of the pressure relief gas reservoir were studied, and the pressure relief gas was proposed. The method of discriminating the location of the reservoir area, and the practice of gas drainage in high-position boreholes at the test working face. The results show that: after the extra-thick coal seam is mined, the height of the overburden caving zone is 49.5 m, and the height of the fracture zone is 104 m. After the key strata in the pressure relief zone on the working face side loses stability, a pressure relief gas reservoir is formed below it. Pressure relief gas reservoir areas are divided into three categories: ①The key layer is in the bent subsidence zone, and the high-level reservoir is formed below it; ②The key layer is in the fracture zone, and the middle-level reservoir is formed under the masonry beam; ③The key layer is in the fracture zone. In the collapse zone, a low-level storage area is formed under the cantilever beam. The shape and area of the reservoir are closely related to the state of the control key layer above. Before the control key layer is broken, the area continues to increase. The shape of the low-level reservoir is rectangular, and the shape of the middle and high-level reservoir is semi-elliptical, expanding to a three-dimensional shape. It is a rectangular cross-section ring body and an elliptical cross-section semi-ellipsoid body; the area decreases rapidly after breaking, and then changes periodically with the pressure of the overlying rock. The low-level reservoir is trapezoidal, the middle-level reservoir is triangular, and the high-level reservoir is shaped like a trapezoid. The shape is a semi-ellipse, and the three-dimensional shape is expanded to a rectangular cross-section ring, a triangular cross-section ring and an elliptical cross-section semi-ellipsoid. The location of the final hole of the high-level borehole was arranged in the range of the middle reservoir area, and the drainage verification was carried out. The maximum drainage concentration of a single hole was 34.5%, the average drainage concentration was 16.8%, and the upper corner gas concentration after drainage was 0.55%, The gas drainage effect is good, indicating that the arrangement of high-level drilling holes according to this method is reasonable.
[1] |
王金华. 特厚煤层大采高综放开采关键技术[J]. 煤炭学报,2013,38(12):2089−2098.
WANG Jinhua. Key technology for fully-mechanized top coal caving with large mining height in extra-thick coal seam[J]. Journal of China Coal Society,2013,38(12):2089−2098.
|
[2] |
闫少宏,尹希文,许红杰,等. 大采高综采顶板短悬臂梁–铰接岩梁结构与支架工作阻力的确定[J]. 煤炭学报,2011,36(11):1816−1820.
YAN Shaohong,YIN Xiwen,XU Hongjie,et al. Roof structure of short cantilever-articulated rock beam and calculation of support resistance in full-mechanized face with large mining height[J]. Journal of China Coal Society,2011,36(11):1816−1820.
|
[3] |
鞠金峰,许家林,王庆雄. 大采高采场关键层“悬臂梁”结构运动型式及对矿压的影响[J]. 煤炭学报,2011,36(12):2115−2120.
JU Jinfeng,XU Jialin,WANG Qingxiong. Cantilever structure moving type of key strata and its influence on ground pressure in large mining height workface[J]. Journal of China Coal Society,2011,36(12):2115−2120.
|
[4] |
鞠金峰,许家林,朱卫兵. 浅埋特大采高综采工作面关键层“悬臂梁”结构运动对端面漏冒的影响[J]. 煤炭学报,2014,39(7):1197−1204.
JU Jinfeng,XU Jialin,ZHU Weibing. Influence of key strata cantilever structure motion on end-face fall in fully-mechanized with super great mining height[J]. Journal of China Coal Society,2014,39(7):1197−1204.
|
[5] |
袁 亮. 卸压开采抽采瓦斯理论及煤与瓦斯共采技术体系[J]. 煤炭学报,2009,34(1):1−8. doi: 10.3321/j.issn:0253-9993.2009.01.001
YUAN Liang. Theory of pressure-relieved gas extraction and technique system of integrated coal production and gas extraction[J]. Journal of China Coal Society,2009,34(1):1−8. doi: 10.3321/j.issn:0253-9993.2009.01.001
|
[6] |
丁 洋,朱 冰,李树刚,等. 高突矿井采空区卸压瓦斯精准辨识及高效抽采[J]. 煤炭学报,2021,46(11):3565−3577.
DING Yang,ZHU Bing,LI Shugang,et al. Accurate identification and efficient drainage of relieved methane in goaf of high outburst mine[J]. Journal of China Coal Society,2021,46(11):3565−3577.
|
[7] |
林海飞,李树刚,赵鹏翔,等. 我国煤矿覆岩采动断裂带卸压瓦斯抽采技术研究进展[J]. 煤炭科学技术,2018,46(1):28−35.
LIN Haifei,LI Shugang,ZHAO Pengxiang,et al. Research progresson pressure released gas drainage technology of mining crackingzone in overburden strata of coal mine in China[J]. Coal Scienceand Technology,2018,46(1):28−35.
|
[8] |
钱鸣高,许家林. 覆岩采动裂隙分布的"O"形圈特征研究[J]. 煤炭学报,1998,23(5):20−23.
QIAN Minggao,XU Jialin. Study on the "O–SHAPE" circle distribution characteristics of mining-induced fractures in the overlayingstrata[J]. Journal of China Coal Society,1998,23(5):20−23.
|
[9] |
李树刚,林海飞,赵鹏翔,等. 采动裂隙椭抛带动态演化及煤与甲烷共采[J]. 煤炭学报,2014,39(8):1455−1462.
LI Shugang,LIN Haifei,ZHAO Pengxiang,et al. Mining fissure elliptic paraboloid zone and dynamic evolution of coal and methane mining[J]. Journal of China Coal Society,2014,39(8):1455−1462.
|
[10] |
林海飞,李树刚,成连华,等. 覆岩采动裂隙带动态演化模型的实验分析[J]. 采矿与安全工程学报,2011,28(2):298−303.
LIN Haifei,LI Shugang,CHENG Lianhua,et al. Experimental analysis of dynamic evolution model of fracture zone caused by overburden mining[J]. Journal of Mining & Safety Engineering,2011,28(2):298−303.
|
[11] |
潘瑞凯,曹树刚,李 勇,等. 浅埋近距离双厚煤层开采覆岩裂隙发育规律[J]. 煤炭学报,2018,43(8):2261−2268.
PAN Ruika,CAO Shugang,LI Yong,et al. Development of overburden fractures for shallow double thick seams mining[J]. Journal of China Coal Society,2018,43(8):2261−2268.
|
[12] |
张玉军,高 超. 急倾斜特厚煤层水平分层综放开采覆岩破坏特征[J]. 煤炭科学技术,2016,44(1):126−132. doi: 10.13199/j.cnki.cst.2016.01.021
ZHANG Yujun,GAO Chao. Overburden rock failure features of steep thick seam horizontal slicing full-mechanized caving mining[J]. Coal Science and Technology,2016,44(1):126−132. doi: 10.13199/j.cnki.cst.2016.01.021
|
[13] |
王海军,刘英杰. 8.8 m特厚煤层采场覆岩运动与应力动态演化研究[J]. 煤炭科学技术,2020,48(11):68−76.
WANG Haijun,LIU Yingjie. Study on overlying stratas movement and stress dynamic evolution above working face in 8.8 m extra-thick coal seam[J]. Coal Science and Technology,2020,48(11):68−76.
|
[14] |
孔令海. 特厚煤层大空间综放采场覆岩运动及其来压规律研究[J]. 采矿与安全工程学报,2020,37(5):943−950.
KONG Linghai. Overlying strata movement law and its strata pressure mechanism in fully mechanized top-coal caving workface with large space[J]. Journal of Mining & Safety Engineering,2020,37(5):943−950.
|
[15] |
侯运炳,何尚森,周殿奇,等. 特厚煤层大采高综放工作面覆岩结构及支架工作阻力研究[J]. 矿业科学学报,2017,2(1):42−48.
HOU Yunbing,HE Shangsen,ZHOU Dianqi,et al. Analysis of overburden structure and support working resistance of working face in fully-mechanized top coal caving with large mining height in ultra thick coal seam[J]. Journal of Mining Science and Technology,2017,2(1):42−48.
|
[16] |
高建良,蔡行行,卢方超,等. 特厚煤层分层开采下伏煤层应力分布及破坏特征研究[J]. 煤炭科学技术,2021,49(5):19−26. doi: 10.13199/j.cnki.cst.2021.05.003
GAO Jianliang,CAI Hanghang,LU Fangchao,et al. Study on underlying coal seam stress distribution and failure characteristics in slicing mining of extra-thick coal seams[J]. Coal Science and Technology,2021,49(5):19−26. doi: 10.13199/j.cnki.cst.2021.05.003
|
[17] |
崔 峰,贾 冲,来兴平,等. 缓倾斜冲击倾向性顶板特厚煤层重复采动下覆岩两带发育规律研究[J]. 采矿与安全工程学报,2020,37(3):514−524.
CUI Feng,JIA Chong,LAI Xingping,et al. Research on development law of overlying rock two zones under repeated mining in extra-thick coal seam with gently inclined and brusting liability roof[J]. Journal of Mining & Safety Engineering,2020,37(3):514−524.
|
[18] |
胡青峰,崔希民,刘文锴,等. 特厚煤层重复开采覆岩与地表移动变形规律研究[J]. 采矿与岩层控制工程学报,2020,2(2):31−39.
HU Qingfeng,CUI Ximin,LIU Wenkai,et al. Law of overburden and surface movement and deformation due to mining super thick coal seam[J]. Journal of Mining and Strata Control Engineering,2020,2(2):31−39.
|
[19] |
程志恒,卢 云,苏士龙,等. 采空区顶板高位走向长钻孔高效抽采瓦斯机理研究[J]. 煤炭科学技术,2020,48(2):136−142.
CHENG Zhiheng,LU Yun,SU Shilong,et al. Mechanism study on high efficiency gas drainage of high level strike long boreholes in gob roof[J]. Coal Science and Technology,2020,48(2):136−142.
|
[20] |
朱焕春,Brummer Richard,Andrieux Patrick. 节理岩体数值计算方法及其应用(一): 方法与讨论[J]. 岩石力学与工程学报,2004,23(20):3444−3449. doi: 10.3321/j.issn:1000-6915.2004.20.009
ZHU Huanchun,Brummer Richard,Andrieux Patrick. Numerical methods and application for jointed rock mass, part 1: approaches and discussions[J]. Chinese Journal of Rock Mechanics and Engineering,2004,23(20):3444−3449. doi: 10.3321/j.issn:1000-6915.2004.20.009
|
[21] |
许家林,钱鸣高. 覆岩关键层位置的判别方法[J]. 中国矿业大学学报,2000,29(5):21−25.
XU Jialin,QIAN Minggao. Method to Distinguish Key Strata in Overburden[J]. Journal of China University of Mining & Technology,2000,29(5):21−25.
|
[22] |
王 涛,盛 谦,陈晓玲. 基于直接法节理网络模拟的三维离散单元法计算[J]. 岩石力学与工程学报,2005,24(10):1649−1653.
WANG Tao,SHENG Qian,CHEN Xiaoling. 3D discrete element method based on direct method of joint network simulation[J]. Chinese Journal of Rock Mechanics and Engineering,2005,24(10):1649−1653.
|
[23] |
侯忠杰. 老顶断裂岩块回转端角接触面尺寸[J]. 矿山压力与顶板管理,1999(Z1):29−31, 40.
HOU Zhongjie. The size of the angular contact surface of the rotating end of the Laoding fractured rock block[J]. Journal of Mining & Safety Engineering,1999(Z1):29−31, 40.
|
[24] |
张建全,廖国华. 覆岩离层产生的机理及离层计算方法的探讨[J]. 地下空间,2001,21(5):407−411, 417.
ZHANG Jianquan,LIAO Guohua. Investigation on Formation Mechanism of Separated Layer of Rock Covering and Calculation Method of Separated Layer[J]. Chinese Journal of Underground Space and Engineering,2001,21(5):407−411, 417.
|
[1] | LU Jingjin, WANG Yunhong, CUI Weixiong, WANG Bingchun, DUAN Jianhua, NAN Hanchen, YANG Wei. Study on physical simulation of mine water disaster monitoring by audio frequency electrical resistivity perspective method in water tank[J]. COAL SCIENCE AND TECHNOLOGY, 2023, 51(S1): 265-274. DOI: 10.13199/j.cnki.cst.2022-1354 |
[2] | CAI Yidong, YANG Chao, LI Qian, LIU Dameng, SUN Fengrui, GUO Guangshan. Research progress of relative permeability experiment and numerical simulation technique in coalbed methane reservoir[J]. COAL SCIENCE AND TECHNOLOGY, 2023, 51(S1): 192-205. DOI: 10.13199/j.cnki.cst.2022-0835 |
[3] | LI Qixian, XU Jiang, PENG Shoujian, HUO Zhonggang, SHU Longyong, YAN Fazhi. Review on the progress for physical simulation for gas reservoirs co-production in multi-pressure system[J]. COAL SCIENCE AND TECHNOLOGY, 2023, 51(9): 149-159. DOI: 10.12438/cst.2022-1225 |
[4] | LI Quangui, DENG Yize, HU Qianting, WU Xiaobin, WANG Xiaoguang, JIANG Zhizhong, LIU Le, QIAN Yanan, SONG Mingyang. Review and prospect of coal rock hydraulic fracturing physical experimental research[J]. COAL SCIENCE AND TECHNOLOGY, 2022, 50(12): 62-72. DOI: 10.13199/j.cnki.cst.mcq22-08 |
[5] | LIU Shiqi, SANG Shuxun, YANG Yanhui, LIU Shupei, DU Yi, WANG Tian, FANG Huihuang. Structure features of high rank coal in parallel bedding and vertical bedding based on low field nuclear magnetic resonance[J]. COAL SCIENCE AND TECHNOLOGY, 2018, (10). |
[6] | Yao Yanbin Liu Dameng, . Petrophysics and fluid properties characterizations of coalbed methane reservoir by using NMR relaxation time analysis[J]. COAL SCIENCE AND TECHNOLOGY, 2016, (6). |
[7] | LI Xiao-ming CAO Dai-yong YAO Zheng WANG Xiao-liang WEI Ying-chun XIANG Xiao-rui, . Study on mechanism of pulverized coal discharge based on flow-state physical simulation[J]. COAL SCIENCE AND TECHNOLOGY, 2015, (2). |
[8] | ZHANG Chun-sen ZHANG Ying LIULei CAO Jian-tao, . Application of Digital Close-photogrammetry in Similar Simulation Experiment[J]. COAL SCIENCE AND TECHNOLOGY, 2014, (11). |
[9] | XU Jiang PENG Shou-jian LIU Dong ZHANG Chao-lin, . Dynamic Response Physical Simulation of Coal Reservoir Parameters During Coalbed Methane Drainage[J]. COAL SCIENCE AND TECHNOLOGY, 2014, (6). |
[10] | Simulation Experiment Study on Freezing Temperature Field of Mine Axial Freeing Inclined Shaft[J]. COAL SCIENCE AND TECHNOLOGY, 2013, (6). |