|
|
|
| A simulation experimental study on high-pressure air blasting of coal |
| CHU Huaibao1,2，WANG Chang1，YANG Xiaolin1,2，YAN Shaoyang1，WEI Haixia1，REN Zhiqiang1，CHEN Zhen1，ZHU Siyuan1 |
1. College of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China;
2. Henan Key Laboratory of Underground Engineering and Disaster Prevention, Henan Polytechnic University, Jiaozuo 454003, China |
|
|
|
Abstract High-pressure air blasting (HPAB) is one type of physical blasting techniques to increases the permeability of the coal seam by instantly releasing high-pressure air to impact the coal. In this paper, the experimental study on the HPAB of simulation coal is conducted using the self-developed HPAB experimental system. To reveal the propagation and attenuation law of stress wave, and the process and mechanism of coal damage-fracture under the action of HPAB, the ultrasonic velocity, strain and cracks propagation speed are tested. Based on the experimental results and the theory of damage fracture mechanics, it can be concluded that the stress wave waveform generated under the action of HPAB is the same as that generated under the action of explosive blasting. However, the peak stress of the HPAB stress wave is smaller than that of the explosive stress wave. Moreover, the action time and the pulse width of the HPAB stress wave are longer than that of the explosive stress wave, and the HPAB stress wave decays at a slower speed (α = 2-μ/(1-μ)). Under the tensile action of the HPAB stress wave, the initial radial cracks in coal are generated firstly, and the initial radial cracks propagate rapidly at 0.15-0.4 times the speed of the ultrasonic velocity. Subsequently, the initial radial cracks propagate steadily at 0.12-0.14 times the speed of the ultrasonic velocity with the combined effect of high-pressure air, the methane gas pressure, and the in-situ stress. Finally, the periodic original cracks, which are in the far area of the blasthole, slowly propagate in a small area with the combined effect of elastic stress wave, the methane gas pressure, the in-situ stress and the interaction between parallel original cracks.
Key words: Simulation coal; High-pressure air blasting (HPAB); Propagation and attenuation law of HPAB stress wave; Coal damage-fracture; Experimental study
|
|
Received: 06 September 2021
Published: 28 October 2022
|
|
|
|
[1] 李和万, 刘戬, 王来贵, 等. 液氮冷加载对不同节理煤样结构损伤的影响[J]. 煤炭学报, 2020, 45(11): 3833-3840.
LI Hewan, LIU Jian, WANG Laigui, et al. Effect of liquid nitrogen on structural damage of coal samples with different joints[J]. Journal of China Coal Society, 2020, 45(11): 3833-3840.
[2] QIN Lei, ZHAI Cheng, LIU Shimin. et al. Factors controlling the mechanical properties degradation and permeability of coal subjected to liquid nitrogen freeze-thaw. Scientific Reports, 2017, 7(1).
[3] 李树刚, 魏宗勇, 林海飞, 等. 煤与瓦斯共采三维大尺度物理模拟实验系统的研制与应用[J]. 煤炭学报, 2019, 44(01): 236-245
LI Shugang, WEI Zongyong, LIN Haifei, et al. Research and development of 3D large-scale physical simulation experimental system for coal and gas co-extraction and its application[J]. Journal of China Coal Society, 2019, 44(1): 236-245.
[4] 高鑫浩, 王明玉. 水力压裂-深孔预裂爆破复合增透技术研究[J]. 煤炭科学技术, 2020, 48(07): 318-324.
GAO Xinhao, WANG Mingyu. Study on hydraulic fracturing-deep hole pre-splitting blasting composite permeability enhancement technology[J]. Coal Science and Technology, 2020, 40(7): 318-324.
[5] 刘晓, 张帆, 马耕. 水力冲孔对煤储层渗透率演化规律影响研究[J]. 煤炭科学技术, 2018, 46(11): 76-81.
LIU Xiao, ZHANG Fan, MA Geng. Study on influence of hydraulic flushed borehole on evolution law of coal reservoir permeability[J]. Coal Science and Technology, 2018, 46(11): 76-81.
[6] 郭君. 低透气性松软煤层高压水力割缝增透机理研究及应用[D]. 北京科技大学, 2019.
[7] 谢和平, 高峰, 鞠杨, 等. 页岩储层压裂改造的非常规理论与技术构想[J]. 四川大学学报(工程科学版), 2012, 44(06): 1-6.
XIE Heping, GAO Feng, JU Yang, et al. Unconventional theories and strategies for fracturing treatments of shale gas strata[J]. Journal of Sichuan University (Engineering Science Edition), 2012, 44(6): 1-6.
[8] 曾范永, 李成全, 孙可明, 等. 气爆对煤体渗透性影响的实验研究[J]. 煤田地质与勘探, 2012, 40(02): 35-38.
ZENG Fanyong, LI Chengquan, SUN Keming, et al. Influence of gas explosion on permeability of coal body[J]. Coal Geology & Exploration, 2012, 40(02): 35-38.
[9] 范俊佳, 琚宜文, 侯泉林, 等. 不同变质变形煤储层孔隙特征与煤层气可采性[J]. 地学前缘, 2010, 17(05): 325-335.
FAN Junjia, JU Yiwen, HOU Quanlin, et al. Pore structure characteristics of different metamorphic-deformed coal reservoirs and its restriction on recovery of coalbed methane[J]. Earth Science Frontiers, 2010, 17( 5) :325-335.
[10] 刘泽功, 蔡峰, 肖应祺. 煤层深孔预裂爆破卸压增透效果数值模拟分析[J]. 安徽理工大学学报(自然科学版), 2008, 28(4): 16-20.
LIU Zegong, CAI Feng, XIAO Yingqi. Numerical simulation and analysis of effect of stress release and permeability improvement in coal seams by deep-hole[J]. Journal of Anhui University of Science and Technology ( Natural Science), 2008, 28(4): 16-20.
[11] 褚怀保, 杨小林, 梁为民, 等. 煤体爆破损伤断裂过程与机理研究[J]. 采矿与安全工程学报, 2018, 35(02): 410-414.
CHU Huaibao, YANG Xiaolin, LIANG Weimin, et al. Study on the damage-fracture process and mechanism of coal blasting[J]. Journal of Mining & Safety Engineering, 2018, 35(2): 410-414.
[12] 褚怀保, 杨小林, 梁为民, 等. 煤体爆破作用机理模拟试验研究[J]. 煤炭学报, 2011, 36(09): 1451-1456.
CHU Huaibao, YANG Xiaolin, LIANG Weimin, et al. Simulation experimental study on the coal blast mechanism[J]. Journal of China Coal Society, 2011, 36(9): 1451-1456.
[13] 王兆丰, 周大超, 李豪君, 等. 液态CO_2相变致裂二次增透技术[J]. 河南理工大学学报(自然科学版), 2016, 35(05): 597-600.
WANG Zhaofeng, ZHOU Dachao, LI Junhao, et al. Research on secondary fracturing technology by phase transformation of liquid CO2[J]. Journal of Henan Polytechnic University( Natural Science), 2016, 35(5): 597-600.
[14] 周盛涛, 罗学东, 蒋楠, 等. 二氧化碳相变致裂技术研究进展与展望[J]. 工程科学学报, 2021, 43(07): 883-893.
ZHOU Shengtao, LUO Xuedong, JIANG Nan, et al. A review on fracturing technique with carbon dioxide phase transition[J]. Chinese Journal of Engineering, 2021, 43(07): 883-893.
[15] 孙可明, 辛利伟, 吴迪, 等. 初应力条件下超临界CO_2气爆致裂规律模拟研究[J]. 振动与冲击, 2018, 37(12): 232-238.
SUN Keming, XIN Liwei, WU Di, et al. Simulation of fracture law of supercritical CO2 explosion under initial stress condition[J]. Journal of Vibration and Shock, 2018, 37(12): 232-238.
[16] 刘文博, 史智元, 段东. 单孔条件下高能气体冲击增透过程中裂纹扩展规律的研究[J]. 煤炭技术, 2019, 38(09): 105-108.
LIU Wenbo, SHI Zhiyuan, DUAN Dong. Study on crack propagation of high-energy gas permeability enhancement process under single hole[J]. Coal Technology, 2019, 38(9): 105-108.
[17] 侯鹏, 高峰, 高亚楠, 等. 脉冲气压疲劳对原煤力学特性及渗透率的影响[J]. 中国矿业大学学报, 2017, 46(02): 257-264.
HOU Peng, GAO Feng, GAO Yanan, et al. Effect of pulse gas pressure fatigue on mechanical properties and permeability of raw coal[J]. Journal of China University of Mining & Technology, 2017, 46(2): 257-264.
[18] 张永民, 蒙祖智, 秦勇, 等. 松软煤层可控冲击波增透瓦斯抽采创新实践—以贵州水城矿区中井煤矿为例[J]. 煤炭学报, 2019, 44(08): 2388-2400.
ZHANG Yongmin, MENG Zuzhi, QIN Yong, et al. Innovative engineering practice of soft coal seam permeability enhancement by controllable shock wave for mine gas extraction: A case of Zhongjing Mine，Shuicheng，Guizhou Province，China[J]. Journal of China Coal Society, 2019, 44(8): 2388-2400.
[19] 林柏泉, 王一涵, 闫发志, 等. NaCl溶液对电脉冲致裂煤体孔隙结构影响的实验研究[J]. 煤炭学报, 2018, 43(05): 1328-1334.
LIN Boquan, WANG Yihan, YAN Fazhi, et al. Experimental study of the effect of NaCl solution on the pore structure of coal body with high-voltage electrical pulse treatments[J]. Journal of China Coal Society, 2018, 43(5): 1328-1334.
[20] 刘路明. 用于煤层气抽放实验的超声波发生器设计与实现[D]. 重庆: 重庆大学, 2008.
[21] SHI Qingmin, QIN Yong, LI Jiuqing, et al. Simulation of the crack development in coal without confining stress under ultrasonic wave treatment[J]. Fuel, 2017, 205: 222-231.
[22] 杨睿月, 丛日超, 刘晗, 等. 液氮冷冲击作用对煤岩微纳米尺度孔隙结构及力学性质的影响[J]. 天然气工业, 2021, 41(07): 82-92.
YANG Ruiyue, CONG Richao, LIU Han, et al. Pore-scale analysis of coal structure and mechanical properties evolution through liquid nitrogen thermal shock[J]. Natural Gas Industry, 2021, 41(07): 82-92.
[23] 曾范永. 煤体高压气体爆破致裂规律的实验研究[J]. 煤矿安全, 2019, 50(01): 13-16.
ZENG Fanyong. Experimental Study on the Fracturing law of Coal Body by high-pressure gas blasting [J]. Coal Mine Safety, 2019, 50(01): 13-16.
[24] 褚怀保, 杨小林, 余永强, 等. 煤体爆破模拟材料选择试验研究[J]. 煤炭科学技术, 2010, 38(5): 31-33.
CHU Huaibao, YANG Xiaolin, YU Yongqiang, et al. Experimental research of the choice for coal blasting simulation material [J]. Coal Science and Technology, 2010, 8(5): 31-33.
[25] 褚怀保, 叶红宇, 杨小林, 等. 基于损伤累积的爆破振动传播规律试验研究[J]. 振动与冲击, 2016, 35(2): 173-177.
CHU Huaibao, YE Hongyu, YANG Xiaolin, et al. Experimental Research on Propagation Law of Blasting Vibration Based on the Damage Accumulation [J]. Journal of Vibration and Shock, 2016, 35(2): 173-177.
[26] 高祥涛, 颜事龙, 谢兴华. 岩石中条形药包爆破瞬态应变的测量[A]. 中国力学学会、郑州大学.中国力学学会学术大会'2009论文摘要集[C].中国力学学会、郑州大学:中国力学学会, 2009:1.
[27] 褚怀保, 杨小林, 侯爱军, 等. 煤体中爆炸应力波传播与衰减规律模拟实验研究[J]. 爆炸与冲击, 2012, 32(02): 185-189.
CHU Huaibao, YANG Xiaolin, HOU Aaijun. Simulation experimental Study on propagation and Attenuation law of explosive stress wave in coal [J]. Explosion and Impact, 2012, 32(02): 185-189.
[28] 赵旭. 高压氮气冲击致裂煤岩体裂隙发育规律研究[D]. 中国矿业大学, 2017.
[29] 汪开旺. 高压空气爆破技术装备研发及应用[J]. 煤炭科学技术, 2016, 44(12):136-140.
WANG Kaiwang. Research and development and application of high pressure air blasting technology and equipment[J]. Coal Science and Technology, 2016,44(12):136-140.
[30] 吕进国, 李守国, 赵洪瑞, 等. 高地应力条件下高压空气爆破卸压增透技术实验研究[J]. 煤炭学报, 2019, 44(04):1115-1128.
LV Jinguo, LI Shouguo, ZHAO Hongrui, et al. Technology of pressure relief and permeability enhancement with pressure air blasting under high geo-stress[J]. Journal of China Coal Society, 2019,44(04):1115-1128.
[31] 杨小林, 王树仁. 岩石爆破损伤断裂的细观机理[J]. 爆炸与冲击, 2000(03): 247-252.
Yang Xiaolin, Wang Shuren. Meso-Mechanism of Damage and Fracture on Rock Blasting[J]. Explosion and Shock Waves, 2000, 20(3):247-252.
[32] Murakami Y. Stress Intensity Factors Handbook, Pergamon Press, 1987.
|
|
|
|
