| Citation: |
ZHANG Guanghui，JIANG Junjun，DENG Zhigang，et al. Research on pressure relief technology of deep and shallow hole combined blasting under retaining small coal pillar in double roadway excavation[J]. Coal Science and Technology，2023，51（11）：33−41. DOI: 10.13199/j.cnki.cst.2022-1532
|
In order to prevent and control the disaster of large deformation and strong ore pressure in the heading roadway under the arrangement of retaining small coal pillars in double roadway heading, the pressure relief technology of deep and shallow hole combined blasting was put forward based on the engineering background of Zhaozhuang coal industry.Through the research on the mechanical structure of the roof of the small pillar roadway and the mechanism of deep and shallow hole combined blasting, the correlation between the deflection of the gob roadway and the roof L of the goaf is revealed, and the location of the roof dip fracture is determined, so as to clarify the mechanism of the deep and shallow hole combined double-layer blasting to eliminate scour and protect the roadway and the mechanism of the deep and shallow hole combined guiding mechanics;The parameters of blasting scheme are determined by theoretical calculation and field test of articulated block.Engineering practice shows that:The pressure relief technology of deep and shallow hole combined blasting can weaken the energy storage attribute of hard composite roof media, optimize the triangle block structure of the goaf boundary roof, and reduce the accumulated energy density of the roof by about 4000 J at the same scale;The boundary roof of the goaf in 1313 working face collapsed in time after mining to reduce the squeezing effect of the roof on the coal pillar. The stress concentration coefficients at the measuring points at different depths of the coal pillar were 1.38 and 1.29, respectively, and the stress concentration degree was significantly reduced;The fan-shaped peaking results show that the fractures in the lower strata are obviously developed, and the upper strata are gradually damaged and fractured. Combined blasting in the roof inclination can reduce the length of the hanging roof of block B, destroy the articulated structure of the old roof, and weaken the slewing and sinking effect of the block.The maximum displacement of 13163 roadway roof and floor and two sides is 440 mm and 205 mm respectively. The blasting measures effectively restrain the roadway deformation, and no dynamic phenomena such as wall caving occur, achieving the goal of deep and shallow hole combined blasting.
| [1] |
侯朝炯,李学华. 综放沿空掘巷围岩大、小结构稳定性原理[J]. 煤炭学报,2001,26(1):1−7.
HOU Chaojiong,LI Xuehua. Stability principle of big and small structures of rock surrounding roadway driven along goaf in fully mechanized top coal caving face[J]. Journal of China Coal Society,2001,26(1):1−7.
|
| [2] |
柏建彪,王卫军,侯朝炯,等. 综放沿空掘巷围岩控制机理及支护技术研究[J]. 煤炭学报,2000,25(5):478−481.
BAI Jianbiao,WANG Weijun,HOU Chaojiong,etal. Control mechanism and support technique about gateway driven along goaf in fully mechanized top coal caving face[J]. Journal of China Coal Society,2000,25(5):478−481.
|
| [3] |
郑西贵,姚志刚,张 农. 掘采全过程沿空掘巷小煤柱应力分布研究[J]. 采矿与安全工程学报,2012,29(4):459−465.
ZHENG Xigui,YAO Zhigang,ZHANG Nong. Stress distributionof coal pillar with gob side entry driving in the process of excava-tion and mining[J]. Journal of Mining & Safety Engineering,2012,29(4):459−465.
|
| [4] |
李学华,梁 顺,姚强岭,等. 冲击倾向性围岩沿空掘巷防冲控制原理及应用[J]. 采矿与安全工程学报,2012,29(6):751−756.
LI Xuehua,LIANG Shun,YAO Qiangling,et al. Control principle and its application of rock burst in roadway driving along goaf with outburst-proneness surrounding rocks[J]. Journal of Mining & Safety Engineering,2012,29(6):751−756.
|
| [5] |
赵国贞,马占国,孙 凯,等. 小煤柱沿空掘巷围岩变形控制机理研究[J]. 采矿与安全工程学报,2010,27(4):517−521.
ZHAO Guozhen,MA Zhanguo,SUN Kai,et al. Research on deformation controlling mechanism of the narrow pillar of roadway driving along next goaf[J]. Journal of Mining and Safety Engineer-ing,2010,27(4):517−521.
|
| [6] |
赵启峰,杜 锋,李 强,等. 综采工作面沿空掘巷围岩控制技术[J]. 煤炭科学技术,2015,43(10):23−28.
ZHAO Qifeng,DU Feng,LI Qiang,et al. Surrounding rock control technology of gateway driven along goaf in fillymechanizedl coal mining face[J]. Coal Science and Technology,2015,43(10):23−28.
|
| [7] |
毕慧杰,邓志刚,李少刚,等. 深孔爆破在小煤柱巷道顶板控制中的应用[J]. 煤炭科学技术,2022,50(3):85−91.
BI Huijie,DENC Zhigang,LI Shaogang,et al. Application of deep hole blasting in roof control of small coal pillarroadway[J]. Coal Science and Technology,2022,50(3):85−91.
|
| [8] |
别小飞,王 文,唐世界,等. 深井高应力切顶卸压沿空掘巷围岩控制技术[J]. 煤炭科学技术,2020,48(9):173−179.
BIE Xiaofei,WANG Wen,TANG Shijie,et al. Surrounding rock control technology of gob-side entry driving in deepshaft with high stress roof cutting and pressure relief[J]. Coal Science and Technology,2020,48(9):173−179.
|
| [9] |
苏振国,邓志刚,李国营,等. 顶板深孔爆破防治小煤柱冲击地压研究[J]. 矿业安全与环保,2019,46(4):21−25.
SU Zhenguo,DENG Zhigang,Ll Guoying,et al. Study on prevention and control of small coal pillar rock burst byroof deep hole blasting[J]. Mining Safety & Environmental Protection,2019,46(4):21−25.
|
| [10] |
王志强,仲启尧,王 鹏,等. 高应力软岩沿空掘巷煤柱宽度确定及围岩控制技术[J]. 煤炭科学技术,2021,49(12):29−37.
WANG Zhiqiang,ZHONG Qiyao,WANG Peng,et al. Determination of coal pillar width and surrounding rock controltechnology for gobside entry driving[J]. Coal Science and Technology,2021,49(12):29−37.
|
| [11] |
王德超,李术才,王 琦,等. 深部厚煤层综放沿空掘巷煤柱合理宽度试验研究[J]. 岩石力学与工程学报,2014,33(3):539−548. doi: 10.13722/j.cnki.jrme.2014.03.012
WANG Dechao,LI Shucai,WANG Qi,et al. Experimental study of reasonable coal pillar width in fully mechanized top coal caving face of thick coal seam[J]. Chinese Journal of Rock Mechanics and Engineering,2014,33(3):539−548. doi: 10.13722/j.cnki.jrme.2014.03.012
|
| [12] |
彭林军,宋振骐,周光华,等. 大采高综放动压巷道窄煤柱沿空掘巷围岩控制[J]. 煤炭科学技术,2021,49(10):34−43.
PENG Linjum,SONG Zhenqi,ZHOU Guanghua,et al. Surroundling rock control on narrow coal pillar along gob in dy-namic pressure roadway with large mining height top coal caving[J]. Coal Science and Technology,2021,49(10):34−43.
|
| [13] |
李民族,马资敏,薛定亮,等. 坚硬顶板深浅孔组合聚能爆破技术研究及应用[J]. 矿业科学学报,2020,5(6):616−623.
LI Minzu,MA Zimin,XUE Dingliang,et al. Research of cumulativeenergy blasting technology with deep and shal-low hole combinedin hard roof[J]. Journal of Mining Science and Technology,2020,5(6):616−623.
|
| [14] |
赵善坤. 深孔顶板预裂爆破力构协同防冲机理及工程实践[J]. 煤炭学报,2021,46(11):3419−3432.
ZHAO Shankun. Mechanism and application of force-structure cooperative prevention and control on rockburstwith deep hole roof pre-blasting[J]. Joumal of China Coal Society,2021,46(11):3419−3432.
|
| [15] |
陈 勇,郝胜鹏,陈延涛,等. 带有导向孔的浅孔爆破在留巷切顶卸压中的应用研究[J]. 采矿与安全工程学报,2015,32(2):253−259.
CHEN Yong,HAO Shengpeng,CHEN Yantao,et al. Study on theapplication of short-hole blasting with guide hole to roof cuttingpressure relief of gob-side entry retaining[J]. Journal of Mining and Safety Engineering,2015,32(2):253−259.
|
| [16] |
魏 炯,朱万成,魏晨慧,等. 导向孔对两爆破孔间成缝过程影响的数值模拟[J]. 工程力学,2013,30(5):335−339.
WEI Jiong,ZHU Wancheng,WEI Chenhui,et al. Numerical simulation on contributionof guide-hole to crack coalesence of two boreholes[J]. Engineering Mechanics,2013,30(5):335−339.
|
| [17] |
刘优平,周正义,黎剑华. 井巷掏槽爆破中空孔效应的理论与试验分析[J]. 金属矿山,2007(2):12−14.
LIU Youping,ZHOU Zhengyi,LI Jianhua. Theoretical and experi-mental study on empty hole effect in tunnel cut blasting[J]. Metal Mine,2007(2):12−14.
|
| [18] |
杨仁树,陈 程,王 煦,等. 不同直径空孔对爆生裂纹扩展行为影响规律的实验研究[J]. 煤炭学报,2017,42(10):2498−2503.
YANG Renshu,CHEN Cheng,WANG Xun,etal. Experimental investigation on the influence of different diameter emply holes on the crack growth behavior of blasting[J]. Jounal of China Coal Society,2017,42(10):2498−2503.
|
| [19] |
钱鸣高, 缪协兴, 许家林, 等. 岩层控制的关键层理论[M]. 徐州: 中国矿业大学出版社, 2003: 16−18.
|
| [20] |
张百胜,王朋飞,崔守清,等. 大采高小煤柱沿空掘巷切顶卸压围岩控制技术研究[J]. 煤炭学报,2021,46(7):2254−2267.
ZHANG Baisheng,WANG Pengfei,CUI Shouqing,et al. Mechanism and surrounding rock control of roadway driving along gob in shallow-buried, large mining height and small coal pillars by roof cutting[J]. Journal of China Coal Society,2021,46(7):2254−2267.
|
| [21] |
王红胜,李树刚,张新志,等. 沿空巷道基本顶断裂结构影响窄煤柱稳定性分析[J]. 煤炭科学技术,2014,42(2):19−22.
WANG Hongsheng,Ll Shuigang,ZHANG Xinzhi,etal. Analysis on Stability of Narrow Coal Pillar Inlutenced by Main Roof Fracture Structure of Gob Side Roadway[J]. Coal Science and Technology,2014,42(2):19−22.
|
Supported by: Beijing Renhe Information Technology Co., Ltd. 
DownLoad: