Research of cumulative energy blasting technology with deep and shallow hole combined in hard roof
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摘要: 针对坚硬顶板条件下实施定向预裂聚能爆破技术后存在钻孔浅部裂缝率低、架后悬顶大的难题,通过理论分析、数值模拟及现场监测,提出了深浅孔组合聚能爆破技术。分析了坚硬顶板单一深孔聚能爆破存在的问题,指出优化钻孔布设及爆破参数是提高爆破效果的主要途径。研究了深浅孔组合聚能爆破技术原理,提出了深浅孔组合能量场理论和组合导向孔力学机制。深浅孔爆破时可形成深部和浅部聚能爆破应力场,同时深孔浅部又对浅孔爆破起到了导向孔的效果,最终可形成切顶范围内的预裂面。现场爆破效果监测,孔内裂缝率提高了30%,并得到了顶板压力变化规律。架后顶板及时垮落充填,消除了坚硬顶板的断裂冲击,降低了留巷围岩控制难度。研究成果可为坚硬顶板条件下切顶留巷的定向预裂高效聚能爆破提供参考。Abstract: To solve the problems of low crack rate and large overhanging roof after directional presplitting cumulative blasting technology is implemented under the condition of hard roof,through theoretical analysis,numerical simulation and field monitoring,the deep and shallow hole combined cumulative energy blasting technology is proposed This paper analyzes the problems of single deep hole combined cumulative energy in hard roof,and points out that optimizing the layout of boreholes and blasting parameters is the main way to improve the blasting effect The technical principle of deep and shallow hole combined cumulative energy blasting is studied,and the theory of combined energy field and mechanical mechanism of combined pilot hole are put forward During the deep and shallow hole blasting,the stress field of the inner section and the outer part can be formed At the same time,the outer part of the deep hole can play the role of the pilot hole in the shallow hole blasting,and finally form the presplitting surface within the scope of the roof cutting Through the monitoring of blasting effect,the crack rate in the hole is increased by 30%,and the variation law of roof pressure is obtained The roof falling and filling in time can eliminate the fracture impact of hard roof and reduce the difficulty of surrounding rock control The research results can provide a reference for directional presplitting high-efficiency cumulative energy blasting under the condition of hard roof
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[1] 何满潮,高玉兵,杨军,等厚煤层快速回采切顶卸压无煤柱自成巷工程试验[J]岩土力学,2018,39(1):254-264 [2] He Manchao,Gao Yubing,Yang Jun,et al. Engineering experimentation of gob-side entry retaining formed by roof cutting and pressure release in a thick-seam fast-extracted mining face [J]Rock and Soil Mechanics,2018,39(1):254-264 [3] 何满潮,马资敏,郭志飚,等深部中厚煤层切顶留巷关键技术参数研究[J]中国矿业大学学报,2018,47(3):468-477 [4] He Manchao,Ma Zimin,Guo Zhibiao,et al. Key parameters of the gob-side entry retaining formed by roof cutting and pressure release in deep medium-thickness coal seams [J]Journal of China University of Mining & Technology,2018,47(3):468-477 [5] 孙晓明,刘鑫,梁广峰,等薄煤层切顶卸压沿空留巷关键参数研究[J]岩石力学与工程学报,2014,33(7):1449-1456 [6] Sun Xiaoming,Liu Xin,Liang Guangfeng,et al. Key parameters of gob-side entry retaining formed by roof cut and pressure releasing in thin coal seams [J]Chinese Journal of Rock Mechanics and Engineering,2014,33(7):1449-1456 [7] 何满潮,曹伍富,单仁亮,等双向聚能拉伸爆破新技术[J]岩石力学与工程学报,2003,22(12):2047-2051 [8] He Manchao,Cao Wufu,Shan Renliang,et al. New blasting technology:bilateral cumulative tensile explosion [J]Chinese Journal of Rock Mechanics and Engineering,2003,22(12):2047-2051 [9] 宋立兵神东矿区切顶卸压成巷技术研究[J]煤炭科学技术,2016,44(8):80-85 [10] Song LibingStudy on roof cutting,pressure released and gateway driving technology in Shendong mining area [J]. Coal Science and Technology,2016,44(8): 80-85 [11] 何满潮,郭鹏飞,王炯,等禾二矿浅埋破碎顶板切顶成巷试验研究[J]岩土工程学报,2018,40(3):391-398 [12] He Manchao,Guo Pengfei,Wang Jiong,et al. Experimental study on gob-side entry formed by roof cut of broken roof at shallow depth of Hecaogou No2 Coalmine [J]Chinese Journal of Geotechnical Engineering,2018,40(3):391-398 [13] 何满潮,高玉兵,杨军,等无煤柱自成巷聚能切缝技术及其对围岩应力演化的影响研究[J]岩石力学与工程学报,2017,36(6):1314-1325 [14] He Manchao,Gao Yubing,Yang Jun,et al. An energy-gathered roof cutting technique in no-pillar mining and its impact on stress variation in surrounding rocks [J]. Chinese Journal of Rock Mechanics and Engineering,2017,36(6):1314-1325 [15] 张国锋,苗沛沛,王二雨,等浅埋沿空留巷切缝顶板断裂条件及移动规律研究[J]矿业科学学报,2017,2(2):109-119 [16] Zhang Guofeng,Miao Peipei,Wang Eryu,et al. Research on roof fracture criterion and moving rule of gob-side entry in shallow seam [J]Journal of Mining Science and Technology,2017,2(2):109-119 [17] 马新根,何满潮,李钊,等复合顶板无煤柱自成巷切顶爆破设计关键参数研究[J]中国矿业大学学报,2019,48(2):236-246,277 [18] Ma Xingen,He Manchao,Li Zhao,et al. Key parameters of gob-side entry retaining automatically formed by roof cutting and blasting in compound roof condition [J]. Journal of China University of Mining & Technology,2019,48(2):236-246,277 [19] 陈上元,赵菲,王洪建,等深部切顶沿空成巷关键参数研究及工程应用[J]岩土力学,2019,40(1):332-342,350 [20] Chen Shangyuan,Zhao Fei,Wang Hongjian,et al. Determination of key parameters of gob-side entry retaining by cutting roof and its application to a deep mine [J]Rock and Soil Mechanics,2019,40(1):332-342,350 [21] 郭鹏飞,张国锋,陶志刚坚硬软弱复合顶板切顶卸压沿空留巷爆破技术[J]煤炭科学技术,2016,44(10):120-124 [22] Guo Pengfei,Zhang Guofeng,Tao ZhigangBlasting technology of gateway retaining along goaf pressure release by roof cutting in hard and weak complex roof [J]Coal Science and Technology,2016,44(10):120-124 [23] 高玉兵,杨军,王琦,等无煤柱自成巷预裂切顶机理及其对矿压显现的影响[J]煤炭学报,2019,44(11):3349-3359 [24] Gao Yubing,Yang Jun,Wang Qi,et al. Mechanism of roof presplitting in a nonpillar mining method with entry automatically retained and its influence on the strata behaviors [J]Journal of China Coal Society,2019,44(11):3349-3359 [25] 高玉兵,杨军,张星宇,等深井高应力巷道定向拉张爆破切顶卸压围岩控制技术研究[J]岩石力学与工程学报,2019,38(10):2045-2056 [26] Gao Yubing,Yang Jun,Zhang Xingyu,et al. Study on surrounding rock control of roadways in deep coal mines based on roof cutting and pressure release technology by directional tensile blasting [J]Chinese Journal of Rock Mechanics and Engineering,2019,38(10):2045-2056 [27] 马资敏,郭志飚,刘晓宇,等切顶留巷冒落矸石碎胀规律与力学特性研究[J]煤炭工程,2017,49(11):94-98 [28] Ma Zimin,Guo Zhibiao,Liu Xiaoyu,et al. Study on bulking rule and mechanical characteristics of fallen gangue in roof-cutting entry retaining [J]Coal Engineering,2017,49(11):94-98 [29] 陶志刚,李梦楠,庞仕辉,等高恒阻大变形锚索静力学特性数值模拟分析及应用[J]矿业科学学报,2020,5(1):34-44 [30] Tao Zhigang,Li Mengnan,Pang Shihui,et al. Research on mechanical property and engineering application of cable with high constant resistance and large deformation [J]Journal of Mining Science and Technology,2020,5(1):34-44
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