Experimental study on rock-breaking load in slot-hydraulic blasting

XIA Bin-wei; GAO Yu-gang; LIU Cheng-wei; OU Chang-nan; PENG Zi-ye; LIU Lang

doi:10.13374/j.issn2095-9389.2019.10.06.002

Volume 42 Issue 9

Sep. 2020

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Article Navigation > Chinese Journal of Engineering > 2020 > 42(9): 1130-1138

XIA Bin-wei, GAO Yu-gang, LIU Cheng-wei, OU Chang-nan, PENG Zi-ye, LIU Lang. Experimental study on rock-breaking load in slot-hydraulic blasting[J]. Chinese Journal of Engineering, 2020, 42(9): 1130-1138. doi: 10.13374/j.issn2095-9389.2019.10.06.002

Citation:

XIA Bin-wei, GAO Yu-gang, LIU Cheng-wei, OU Chang-nan, PENG Zi-ye, LIU Lang. Experimental study on rock-breaking load in slot-hydraulic blasting[J]. Chinese Journal of Engineering, 2020, 42(9): 1130-1138. doi: 10.13374/j.issn2095-9389.2019.10.06.002

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Experimental study on rock-breaking load in slot-hydraulic blasting

doi: 10.13374/j.issn2095-9389.2019.10.06.002

XIA Bin-wei^{1, 2},
GAO Yu-gang^{1, 2},
LIU Cheng-wei^{1, 2
,
,},
OU Chang-nan^{1, 2},
PENG Zi-ye^{1, 2},
LIU Lang^{1, 2}

1.
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China
2.
National & Local Joint Engineering Laboratory of Gas Drainage in Complex Coal Seam, Chongqing University, Chongqing 400030, China

More Information

Corresponding author: E-mail: liuchengwei12@126.com
Received Date: 2019-10-06
Publish Date: 2020-09-20

Abstract

Abstract

Slot blasting is widely used in mining and tunnel construction, municipal demolition, water conservation, hydropower, and other related projects due to its low cost and high efficiency. In the slot-blasting technique, it is necessary to break the rock efficiently and minimize the damage to the area surrounding the rock. Therefore, improving the blasting efficiency and explosive energy utilization rate as well as reducing the blasting vibration and excessive crushing of rocks are of great significance to the development of blasting engineering. When air spaced uncoupling medium is used in slot blasting, its rock-breaking efficiency is significantly low due to various factors such as generation of shock waves, low quasi-static pressure, low energy utilization rate of explosive, and weak rock-breaking ability. To improve the rock-breaking load of slot blasting, the slot-hydraulic blasting method was proposed. In this method, water is utilized as the uncoupling medium for slot blasting as water has better microcompressibility and high energy transfer efficiency; in addition, research on its characteristics under rock-breaking load was investigated. Slot blasting with air spaced uncoupling charge and slot-hydraulic blasting tests were carried out under the independently developed slot blast load test system. The test results show that the shockwave pressure of slot-hydraulic blasting tests is approximately 35 times that of the air uncoupling blasting method because of the generation of high-pressure shockwaves and the higher incident efficiency. The hydraulic blasting quasi-static pressure is 37–46 times that of the air spaced uncoupled blasting, the quasi static pressure drop of hydraulic blasting is slow, and the pressure holding time is longer. The research results reveal that the energy utilization rate in the slot-hydraulic blasting is high and the blasting load improvement is significant. These results may help to better understand the rock-breaking load characteristics of slot-hydraulic blasting and provide theoretical and experimental support for utilizing the method in engineering applications.
- slotting,
- hydraulic blasting,
- rock-breaking load,
- shock wave,
- quasi-static pressure

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References(25)

References

[1]	楊仁樹, 左進京, 李永亮, 等. 不同切縫管材質下切縫藥包爆炸沖擊波傳播特性研究. 中國礦業大學學報, 2019, 48(2):229 Yang R S, Zuo J J, Li Y L, et al. Experimental study of slotted cartridge explosion shock wave propagation characteristic with different cutting seam pipe material. <italic>J China Univ Min Technol</italic>, 2019, 48(2): 229
[2]	李清, 于強, 朱各勇, 等. 不同藥量的切縫藥包雙孔爆破裂紋擴展規律試驗. 巖石力學與工程學報, 2017, 36(9):2205 Li Q, Yu Q, Zhu G Y, et al. Experimental study of crack propagation under two-hole slotted cartridge blasting with different amounts of charge. <italic>Chin J Rock Mech Eng</italic>, 2017, 36(9): 2205
[3]	祝云華, 徐小鵬. 基于損傷機制的切槽控制爆破特性研究. 煤炭學報, 2017, 42(增刊2): 369 Zhu Y H, Xu X P. Damage control characteristics for notched blasting based on the damage mechanism. J China Coal Soc, 2017, 42(Suppl 2): 369
[4]	岳中文, 郭洋, 王煦. 切槽孔爆炸載荷下裂紋擴展行為的實驗研究. 巖石力學與工程學報, 2015, 34(10):2018 Yue Z W, Guo Y, Wang X. Experimental study of crack propagation under blasting load in notched boreholes. <italic>Chin J Rock Mech Eng</italic>, 2015, 34(10): 2018
[5]	楊仁樹, 車玉龍, 馮棟凱, 等. 切縫藥包預裂爆破減振技術試驗研究. 振動與沖擊, 2014, 33(12):7 Yang R S, Che Y L, Feng D K, et al. Tests for blasting vibration reduction technique with presplitting blasting of a slotted cartridge. <italic>J Vib Shock</italic>, 2014, 33(12): 7
[6]	徐穎, 沈兆武, 孟益平. 爆炸載荷作用下刻槽炮孔動態裂紋擴展規律. 中國科學技術大學學報, 2003, 33(2):184 doi: 10.3969/j.issn.0253-2778.2003.02.009 Xu Y, Shen Z W, Meng Y P. Investigation on dynamic expanding rule and application in notch blasting. <italic>J Univ Sci Technol China</italic>, 2003, 33(2): 184 doi: 10.3969/j.issn.0253-2778.2003.02.009
[7]	楊仁樹, 蘇洪. 爆炸荷載下含預裂縫的裂紋擴展實驗研究. 煤炭學報, 2019, 44(2):482 Yang R S, Su H. Experimental study on crack propagation with pre-crack under explosion load. <italic>J China Coal Soc</italic>, 2019, 44(2): 482
[8]	康勇, 鄭丹丹, 粟登峰, 等. 水射流切槽定向聚能爆破模型及數值模擬研究. 振動與沖擊, 2015, 34(9):182 Kang Y, Zheng D D, Su D F, et al. Model of directional shaped blasting assisted with water jet and its numerical simulation. <italic>J Vib Shock</italic>, 2015, 34(9): 182
[9]	林德余, 馬萬昌, 李忠, 等. 巖石爆破中水墊層作用的研究. 巖石力學與工程學報, 1992, 11(2):130 Lin D Y, Ma W C, Li Z, et al. Research on the effects of bottom water cushion on long hole blasting. <italic>Chin J Rock Mech Eng</italic>, 1992, 11(2): 130
[10]	孫磊, 任慶峰, 宗琦. 水不耦合裝藥結構在煤礦井巷掘進光面爆破中的應用. 爆破, 2010, 27(3):25 doi: 10.3963/j.issn.1001-487X.2010.03.007 Sun L, Ren Q F, Zong Q. Application of water-decoupled charge in smooth blasting of coal mine rock tunnel. <italic>Blasting</italic>, 2010, 27(3): 25 doi: 10.3963/j.issn.1001-487X.2010.03.007
[11]	Huang B X, Liu C Y, Fu J H, et al. Hydraulic fracturing after water pressure control blasting for increased fracturing. <italic>Int J Rock Mech Min Sci</italic>, 2011, 48(6): 976 doi: 10.1016/j.ijrmms.2011.06.004
[12]	馬坤, 初哲, 王可慧, 等. 小當量炸藥深水爆炸氣泡脈動模擬實驗. 爆炸與沖擊, 2015, 35(3):320 doi: 10.11883/1001-1455-(2015)03-0320-06 Ma K, Chu Z, Wang K H, et al. Experimental research on bubble pulse of small scale charge exploded under simulated deep water. <italic>Explosion Shock Waves</italic>, 2015, 35(3): 320 doi: 10.11883/1001-1455-(2015)03-0320-06
[13]	李立州, 羅驍, 張新燕, 等. 裝藥量對近壁面氣泡形態影響的研究. 中北大學學報: 自然科學版, 2019, 40(4):336 Li L Z, Luo X, Zhang X Y, et al. Study on the impact of explosion charge on bubble shape in near-wall. <italic>J North Univ China Nat Sci Ed</italic>, 2019, 40(4): 336
[14]	蔡永樂, 付宏偉. 水壓爆破應力波傳播及破煤巖機理實驗研究. 煤炭學報, 2017, 42(4):902 Cai Y L, Fu H W. Experimental study on hydraulic blasting stress wave propagation and coal broken mechanism. <italic>J China Coal Soc</italic>, 2017, 42(4): 902
[15]	朱禮臣, 孫詠. 深孔水耦合爆破開挖溝槽. 工程爆破, 2000, 6(2):67 doi: 10.3969/j.issn.1006-7051.2000.02.015 Zhu L C, Sun Y. Digging of a trench by water-coupled longhole blasting. <italic>Eng Blast</italic>, 2000, 6(2): 67 doi: 10.3969/j.issn.1006-7051.2000.02.015
[16]	羅勇, 崔曉榮, 陸華. 炮孔水介質不耦合裝藥爆破的研究. 有色金屬(礦山部分), 2009, 61(1):46 Luo Y, Cui X R, Lu H. Study on blasting with water decoupling charging in borehole. <italic>Nonferrous Met </italic>(<italic>Mine Sect</italic>)<italic></italic>, 2009, 61(1): 46
[17]	宗琦, 李永池, 徐穎. 炮孔水耦合裝藥爆破孔壁沖擊壓力研究. 水動力學研究與進展(A輯), 2004, 19(5):610 Zong Q, Li Y C, Xu Y. Preliminary discussion on shock pressure on hole wall when water-couple charge blasting in the hole. <italic>Chin J Hydrodyn</italic>, 2004, 19(5): 610
[18]	夏彬偉, 劉承偉, 盧義玉, 等. 縫槽水壓爆破導向裂縫擴展實驗研究. 煤炭學報, 2016, 41(2):432 Xia B W, Liu C W, Lu Y Y, et al. Experimental study of propagation of directional fracture with slotting hydraulic blasting. <italic>J China Coal Soc</italic>, 2016, 41(2): 432
[19]	趙金昌. 雙介質不耦合斷裂損傷控制爆破技術研究[學位論文]. 太原: 太原理工大學, 2005 Zhao J C. Research on the Controlled Blasting Method under the Condition of Decoupling Charge with Two Kinds of Mediums[Dissertation]. Taiyuan: Taiyuan University of Technology, 2005
[20]	宋守志. 固體介質中的應力波. 北京: 煤炭工業出版社, 1989 Song S Z. Stress Wave in Solid Medium. Beijing: China Coal Industry Publishing House, 1989
[21]	李翼祺, 馬素貞. 爆炸力學. 北京: 科學出版社, 1992 Li Y Q, Ma S Z. Mechanics of Explosion. Beijing: Science Press, 1992
[22]	李可恩. 含高速屏蔽層的地震數據采集及分析[學位論文]. 成都: 成都理工大學, 2007 Li K E. Seismic Acquisition and Analysis in the Area of High Velocity Shielding Layers[Dissertation]. Chengdu: Chengdu University of Technology, 2007
[23]	杜功煥, 朱哲民, 龔秀芬. 聲學基礎. 南京: 南京大學出版社, 2001 Du G H, Zhu Z M, Gong X F. Acoustics Foundation. Nanjing: Nanjing University Press, 2001
[24]	Anderson Jr C E, Baker W E, Wauters D K, et al. Quasi-static pressure, duration, and impulse for explosions (e.g. HE) in structures. <italic>Int J Mech Sci</italic>, 1983, 25(6): 455 doi: 10.1016/0020-7403(83)90059-0
[25]	劉文祥, 張德志, 鐘方平, 等. 球形爆炸容器內炸藥爆炸形成的準靜態氣體壓力. 爆炸與沖擊, 2018, 38(5):1045 doi: 10.11883/bzycj-2017-0056 Liu W X, Zhang D Z, Zhong F P, et al. Quasi-static gas pressure generated by explosive charge blasting in a spherical explosion containment vessel. <italic>Explos Shock Waves</italic>, 2018, 38(5): 1045 doi: 10.11883/bzycj-2017-0056