铁路隧道机械化装药掏槽爆破参数的优化

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Parameter Optimization of Mechanized Charging Cut Blasting in Railway Tunnel Construction

GAO Xuan （D2） ， YIN Xunjang②， WANG Shuaishai②， MA Logang （1）（2） ， GU0 Yabin② （204 ① CCCC Second Highway Engineering Co.，Ltd.（Shaanxi Xi'an，710065） ② Research and Development Center on Construction Technology of Long Bridge and Tunnel in Mountain Areas，CCCC（Shaanxi Xi'an，710199）

[ABSTRACT]Inorderto realize theapplicationof intellgent blasting technology intunnels，parameteroptimizationof mechanized chargingcut blasting inrailway tunnel blasting construction wasstudied.Therange of spacing between the hollowhole andthecentral of the holow hole has beendeterminedthrough theoretical calculations.UsingLS-DYNA numerical simulation software，simulation studies were conductedon blasting schemes with a distance of 12.5，22.5cmand 42.5cm betweenthecenterof the hollow holeand the hollow hole within the theoretical range.Efective stress，damage evolution， andblasting vibrationofthebotomcrosectioofthehole，crosectioatadistanceof1/2ofthelengthof theblasthole fromthe detonation center，and thecrossectionat the orifice ineach simulation scheme were analyzed.The results show thatas the distance betweenthecentral hollow holeand the holow hole increases，thepeak effective stress andthedamage areain hecuting areashow atrend offirst increasing and then decreasing，andtheaverage blasting vibration velocity showsadecreasingtrend.Thetheslot penetration gradually becomes worse.Aftercomprehensive analysis ofthree blasting models，the distance between the center cut hole andthe hollow hole was determined tobe2.5cm.Afterapplying theoptimizedblastingparameters toon-siteblasting，itwasfoundthattherock fragmentationratesignificantlydecreased，withan average linear over excavation reduction of 19.23% . The blasting outcome was good.

[KEYWORDS]mixed explosive；distance between empty holes and cavity holes；porosity effect；numerical simulation; effective stress

0 引言

钻爆法因高效、经济的优点而被广泛应用于我国山岭隧道的建设中，但相较目前已经实现机械化或通过5G技术远程操作机器实现自动化、智能化的通风、支护、装碴、运输等工序，装药、爆破工序仍以人工作业为主。（剩余9435字）