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| Blasting anti-reflection technology of large diameter control hole in hard coal seam |
| Li Zhenwu 1, 2, Min Qi 1, 2, Bian Xinyong 1, 2, Guo Wenjia 3 |
| 1. Jining Energy Development Group Co., Ltd., Jining 272000, China; 2. Jining Mining Group , Jining 272000, China;
3. Huozhou Coal and Electricity Group, Linfen 041000, Chin |
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Abstract In order to improve the effect of coal gas extraction, taking the blasting and permeability improvement of No.18204 Face in Shaping Coal Mine as the research object, the discrete element method is used to study the velocity field, stress field and fracture field under the conditions of no control hole and control hole radius of 60 mm, 80 mm and 100 mm respectively. The results show that the larger the diameter of the control hole, the greater the reflection degree of the stress wave, the greater the range of the stress concentration zone, the greater the frequency of fracture development around the control hole, the greater the degree of connectivity, and the more conducive to the fracture along the ' blast hole-control hole-blast hole '. On this basis, the field test of deep hole blasting antireflection in No.18204 Face was carried out. The results show that the average gas concentration of large diameter control hole and control hole with radius of 100 mm increases by 96.7% ~ 99.3%, and good blasting antireflection effect is obtained. The research results can provide reference for blasting parameter design and scientific research of blasting antireflection operation.
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| [ 1 ] 张超林，王恩元，许 江，等. 瓦斯抽采中煤层参数动态响应及其应用[ J ]. 煤炭科学技术，2021，49（ 5 ）：127 - 134.
[ 2 ] 徐向宇，姚邦华，魏建平，等. 煤层预裂爆破应力波传播规律及增透机理模拟研究[ J ]. 爆破，2016，33（ 2 ）：32 - 38.
[ 3 ] 仝少凯，高德利. 波动注入水力压裂诱发微地震的力学机制及其对压裂效果的影响[ J ]. 石油钻采工艺，2020，42（ 1 ）：98 - 113.
[ 4 ] 张东晓，杨婷云. 美国页岩气水力压裂开发对环境的影响[ J ]. 石油勘探与开发，2015，42（ 6 ）：801 - 807.
[ 5 ] 钱伯章，李武广. 页岩气井水力压裂技术及环境问题探讨[ J ]. 天然气与石油，2013，31（ 1 ）：48 - 53.
[ 6 ] 赵宝友，王海东. 我国低透气性本煤层增透技术现状及气爆增透防突新技术[ J ]. 爆破，2014，31（ 3 ）：32 - 41.
[ 7 ] 李豪君，王兆丰，陈喜恩，等. 液态CO2相变致裂技术在布孔参数优化中的应用[ J ]. 煤田地质与勘探，2017，45（ 4 ）：31 - 37.
[ 8 ] 蔡 峰，刘泽功. 耦合装药特性对深孔预裂爆破应力波能量衰减的影响[ J ]. 煤炭学报，2014，39（ s2 ）：384 - 389.
[ 9 ] 邓 川. 深孔预裂爆破增透技术在石门揭煤中的应用[ J ]. 煤炭技术，2019，38（ 10 ）：102 - 104.
[ 10 ] 武福生. 深孔二次爆破增透效果的试验研究[J].煤炭技术，2019，38（ 6 ）：118 - 120.
[ 11 ] 赵 坚，陈寿根，蔡军刚，等. 用UDEC模拟爆炸波在节理岩体中的传播[ J ]. 中国矿业大学学报，2002（ 2 ）：4 - 8. |
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