| Citation: |
GAO Kui，WANG Mi，QIAO Guodong，et al. Simulation test research and application of blasting and penetration improvement in the soft coal seam floor[J]. Coal Science and Technology，2024，52（6）：102−110. DOI: 10.12438/cst.2023-0914
|
Aimed at the problems of difficult drilling construction of blast penetration, undeveloped fractures produced by blast penetration, and the fractures is easy to recompact in the soft coal seam, the blasting operations carried out in the floor was proposed to achieve the purpose of increasing the penetration of soft coal seams and thus improve the effectiveness of gas extraction. In order to monitor the cross-interface stress wave propagation pattern and the damage state of the coal seam, a physical model was constructed in the laboratory and a similar simulation test of coal seam floor blasting was carried out. Concurrently, the numerical simulation research method was employed to supplement the evolution of damage and fractures within the coal and rock during the blasting process of the coal seam floor. The results shown that, the blast cracks expanded along the blast hole to the surrounding rock mass in soft coal seam floor, causing more serious damage at the location of blast hole, the coal-rock interface of the floor, and within the coal seam, producing cross-interfacial damage cracks. When the explosive stress wave propagated from the soft coal seam base rock layer to the soft coal seam, the interface between the rock and the soft coal generated transmitted compressive stress wave and reflected tensile stress wave. Transmission waves acted on the soft coal to increase the fractures in the coal seam. Meanwhile, the reflected waves reacted on the rock, forming cross-cracks in the coal-rock interface, making the fractures of the rock floor and the soft coal seam penetrated, which was conducive to the vertical transport flow of gas in the soft coal seam and the extraction of pressure-relief gas. Field application at Pan Yidong coal mine shown that, the pure volume of gas extraction and its concentration increased rapidly after blasting the coal seam floor to improve the penetration. The pure volume of gas extraction increased from 0.06 m3/min to 1.46 m3/min, an increase of 23.33 times. Gas concentration surged from 10.46% before blasting to approximately 45.5%, an increase of 3.34 times, and remained at a high level for a long time. The research results can provide theoretical basis and technical support for efficient gas extraction from deep soft coal seams.
| [1] |
袁亮. 我国深部煤与瓦斯共采战略思考[J]. 煤炭学报,2016,41(1):1−6.
YUAN Liang. Strategic thinking of simultaneous exploitation of coal and gas in deep mining[J]. Journal of China Coal Society,2016,41(1):1−6.
|
| [2] |
张建民,李全生,张勇,等. 煤炭深部开采界定及采动响应分析[J]. 煤炭学报,2019,44(5):1314−1325.
ZHANG Jianmin,LI Quansheng,ZHANG Yong,et al. Definition of deep coal mining and response analysis[J]. Journal of China Coal Society,2019,44(5):1314−1325.
|
| [3] |
袁亮. 深部采动响应与灾害防控研究进展[J]. 煤炭学报,2021,46(3):716−725.
YUAN Liang. Research progress of mining response and disaster prevention and control in deep coal mines[J]. Journal of China Coal Society,2021,46(3):716−725.
|
| [4] |
张超林,王恩元,王奕博,等. 近20年我国煤与瓦斯突出事故时空分布及防控建议[J]. 煤田地质与勘探,2021,49(4):134−141. doi: 10.3969/j.issn.1001-1986.2021.04.016
ZHANG Chaolin,WANG Enyuan,WANG Yibo,et al. Spatial-temporal distribution of outburst accidents from 2001 to 2020 in China and suggestions for prevention and control[J]. Coal Geology & Exploration,2021,49(4):134−141. doi: 10.3969/j.issn.1001-1986.2021.04.016
|
| [5] |
ZOU Q L ,LIN B Q ,ZHENG C S,et al. Novel integrated techniques of drilling-eslotting-eseparation-sealing for enhanced coal bed methane recovery in underground coal mines[J]. Journal of Natural Gas Science and Engineering,2015,26:960-973.
|
| [6] |
ZONG Q T,SHENG Q Y,CHENG Z,et al. Coal pores and fracture development during CBM drainage:their promoting effects on the propensity for coal and gas outbursts[J]. Journal of Natural Gas Science and Engineering,2018,51:9−17. doi: 10.1016/j.jngse.2018.01.003
|
| [7] |
ZHENG C,JIANG B,XUE S,et al. Coalbed methane emissions and drainage methods in underground mining for mining safety and environmental benefits:a review[J]. Process Safety and Environmental Protection,2019,127:103−124. doi: 10.1016/j.psep.2019.05.010
|
| [8] |
CHEN D D,HE W R,XIE S R,et al. Increased permeability and coal and gas outburst prevention using hydraulic flushing technology with cross-seam borehole[J]. Journal of Natural Gas Science and Engineering,2020,73:103067. doi: 10.1016/j.jngse.2019.103067
|
| [9] |
WEI Y,CHANG Z L,GUANG Y S,et al. Coal and gas outburst control using uniform hydraulic fracturing by destress blasting and water-driven gas release[J]. Journal of Natural Gas Science and Engineering,2020,79:103360. doi: 10.1016/j.jngse.2020.103360
|
| [10] |
ZHAO J J,ZHANG Y,RANJITH P G. Numerical simulation of blasting induced fracture expansion in coal masses[J]. International Journal of Rock Mechanics and Mining Sciences,2017,100:28−39. doi: 10.1016/j.ijrmms.2017.10.015
|
| [11] |
郭德勇,张超,朱同功,等. 深孔聚能爆破起爆位置对煤层致裂增透的影响[J]. 煤炭学报,2021,46(S1):302−311.
GUO Deyong,ZHANG Chao,ZHU Tonggong,et al. Effect of detonating position of deep-hole cumulative blasting on coal seam cracking and permeability enhancement[J]. Journal of China Coal Society,2021,46(S1):302−311.
|
| [12] |
郭德勇,赵杰超,朱同功,等. 双孔聚能爆破煤层裂隙扩展贯通机理[J]. 工程科学学报,2020,42(12):1613−1623.
GUO Deyong,ZHAO Jiechao,ZHU Tonggong,et al. Crack propagation and coalescence mechanism of double-hole cumulative blasting in coalseam[J]. Chinese Journal of Engineering,2020,42(12):1613−1623.
|
| [13] |
郭德勇,赵杰超,吕鹏飞,等. 煤层深孔聚能爆破有效致裂范围探讨[J]. 工程科学学报,2019,41(5):582−590.
GUO Deyong,ZHAO Jiechao,LYU Pengfei,et al. Effective fracture zone under deep-hole cumulative blasting in coal seam[J]. Chinese Journal of Engineering,2019,41(5):582−590.
|
| [14] |
夏彬伟,刘承伟,卢义玉,等. 缝槽水压爆破导向裂缝扩展实验研究[J]. 煤炭学报,2016,41(2):432−438.
XIA Binwei,LIU Chengwei,LU Yiyu,et al. Experimental study of propagation of directional fracture with slotting hydraulic blasting[J]. Journal of China Coal Society,2016,41(2):432−438.
|
| [15] |
刘见中,孙海涛,雷毅,等. 煤矿区煤层气开发利用新技术现状及发展趋势[J]. 煤炭学报,2020,45(1):258−267.
LIU Jianzhong,SUN Haitao,LEI Yi,et al. Current situation and development trend of coalbed methane development and utilization technology in coal mine area[J]. Journal of China Coal Society,2020,45(1):258−267.
|
| [16] |
田坤云,宫伟东,魏二剑,等. 松软煤层及砂岩顶板水力挠动卸压增透效果对比分析[J]. 煤炭学报,2021,46(6):1888−1897.
TIAN Kunyun,GONG Weidong,WEI Erjian,et al. Gas pressure relief-permeability increase effect comparative analysis about hydraulic disturbance to soft coal seam and its sandstone roof[J]. Journal of China Coal Society,2021,46(6):1888−1897.
|
| [17] |
龚敏,张凤舞,文斌,等. 煤巷底板岩石爆破提高瓦斯抽放率的应用与数值模拟[J]. 煤炭学报,2012,37(6):972−977.
GONG Min,ZHANG Fengwu,WEN Bin,et al. Numerical simulation and application on blasting to improve gas drainage rate in floor rock of coal roadway[J]. Journal of China Coal Society,2012,37(6):972−977.
|
| [18] |
穆朝民,齐娟. 爆炸荷载作用下煤体裂纹扩展机理模型实验研究[J]. 振动与冲击,2012,31(13):58−61. doi: 10.3969/j.issn.1000-3835.2012.13.012
MU Chaomin,QI Juan. Model investigation on cracks propagation in coal under blast loading[J]. Journal of Vibration and Shock,2012,31(13):58−61. doi: 10.3969/j.issn.1000-3835.2012.13.012
|
| [19] |
高魁,刘泽功,刘健,等. 定向聚能爆破弱化综掘工作面逆断层应用研究[J]. 岩石力学与工程学报,2019,38(7):1408−1419.
GAO Kui,LIU Zegong,LIU Jian,et al. Application research of directional cumulative blasting for weakening reverse faults in fully mechanized excavation face[J]. Chinese Journal of Rock Mechanics and Engineering,2019,38(7):1408−1419.
|
| [20] |
高魁,刘泽功,刘健,等. 爆破应力波在构造带煤岩的传播规律及破坏特征[J]. 煤炭学报,2018,43(S1):79−86.
GAO Kui,LIU Zegong,LIU Jian,et al. Propagation law and failure characteristics of blasting stress wave in structural belt coal-rock[J]. Journal of China Coal Society,2018,43(S1):79−86.
|
| [1] | BAO Xiankai, QIAO Jianlong, CUI Guangqin, WANG Lingyu, TIAN Baolong, WANG Lizhi. Damage and crack propagation evolution of coal rock under combined voltage discharge in water[J]. COAL SCIENCE AND TECHNOLOGY, 2025, 53(3): 247-261. DOI: 10.12438/cst.2024-1406 |
| [2] | ZHANG Xin, LIU Zegong, ZHANG Jianyu, FU Shigui, QIAO Guodong, YANG Shuai, CHANG Shuai. Study on propagation law of cracking and permeability enhancement caused by blasting in deep high-gas coal seams[J]. COAL SCIENCE AND TECHNOLOGY, 2024, 52(7): 89-100. DOI: 10.12438/cst.2023-1622 |
| [3] | JIANG Changbao, YANG Yihao, LIU Huihui, GUO Jianquan, FU Yinlan, WU Jiayao. Study on influence of natural fractures on initiaition and propagation of hydraulic fracturing coal[J]. COAL SCIENCE AND TECHNOLOGY, 2024, 52(5): 92-101. DOI: 10.12438/cst.2023-0813 |
| [4] | WANG Kaifei, ZHANG Changsuo, HAO Bingyuan, ZHANG Shengli. Study on initiation and propagation mechanism of internal cracks caused by dynamic and static action of shaped charge blasting under in-situ stress[J]. COAL SCIENCE AND TECHNOLOGY, 2023, 51(S1): 50-64. DOI: 10.13199/j.cnki.cst.2022-1042 |
| [5] | QIN Nan ZHANG Zuoliang FENG Xuezhi LIU Yaqi CUI Lizhuang WANG Yongyan, . Study on uniaxial strength and crack propagation law of cracked similar rock after creep[J]. COAL SCIENCE AND TECHNOLOGY, 2020, 48(12). |
| [6] | CHEN Demin, LONG Qingming, YUE Jianping, ZHANG Xianshang, MOU Jingshan. Numerical study on the effect of directional perforationin coal on crack propagation in hydraulic fracturing[J]. COAL SCIENCE AND TECHNOLOGY, 2020, 48(11): 129-134. |
| [7] | WANG Lei, LIANG Weiguo. Experimental study on crack propagation of coal-rock mass under supercritical CO2 fracturing[J]. COAL SCIENCE AND TECHNOLOGY, 2019, (2). |
| [8] | YANG Jianhui, HU Dongrong, ZHU Chenhong, ZHU Jianghong. Study on numerical simulation on shaped charge blasting parameters of peripheral holes[J]. COAL SCIENCE AND TECHNOLOGY, 2019, (1). |
| [9] | SHEN Chunming, LIN Baiquan, LIU Ting, WANG Weihua, YANG Xin. Analysis on particle flow of crack propagation in slotting coal and rock sample[J]. COAL SCIENCE AND TECHNOLOGY, 2018, (7). |
| [10] | XU Xiaoyun, ZHANG Mingming. Study on T stress affected to crack fracturing and extension mechanism ofhalf disc rock specimen[J]. COAL SCIENCE AND TECHNOLOGY, 2018, (3). |
Supported by: Beijing Renhe Information Technology Co., Ltd. 
DownLoad: