爆破2025，Vol.42Issue(3)：78-85,157,9.DOI:10.3963/j.issn.1001-487X.2025.03.009
轴向聚能装药结构中乳化炸药合理殉爆距离研究
Research on Rational Sympathetic Detonation Distance of Emulsion Explosives in Axial Shaped Charge Loading Structure
摘要
Abstract
To attain precise regulation of the smooth blasting effects during tunnel excavation,this paper employs the LS-DYNA fluid-solid coupling algorithm and a cubic polynomial ignition and growth equation of state to develop a numerical model of shaped charge jet initiation of explosives.A study on the optimal detonation distance for emulsi-fied explosives within an axially shaped charge configuration was conducted.Additionally,field experiments on axial energy-focused charge structures were performed based on the tunnel blasting excavation project of the Hongshimen Tunnel on the Chengping Expressway(Beijing section).The research results indicate the following:(1)When emplo-ying the commonly used axial energy-focused charge structure in industry,approximately 25 cm of movement occurs at the tip of the energy-focused jet 110 μs after the main charge detonation.At this point,the jet separates from the plug.Subsequently,the energy-focused jet becomes discontinuous and fragmented during its motion,which may ad-versely affect the initiation of the explosive charge.Therefore,selecting an appropriate explosive spacing is crucial for the successful detonation of the initiated explosive by the energy-focused jet.(2)Based on the analysis of jet head pressure and explosive reaction characteristics,it is observed that when the explosive spacing exceeds 50 cm,the im-pact pressure exerted by the jet on the initiated explosive is less than the critical initiation pressure of the emulsified explosive.As the explosive spacing increases,the distance that the jet penetrates the explosive during detonation also gradually increases.When the explosive spacing exceeds 90 cm,the jet fails to initiate the explosive charge.(3)Field tests were conducted based on the tunnel blasting project of the Chengping Expressway(Beijing section)with explo-sive spacings of 50 cm and 70 cm.The test results revealed that better control of over-excavation and under-excava-tion was achieved at a spacing of 70 cm.Therefore,under the conditions of this project,a reasonable detonation dis-tance is determined to be 70 cm.The findings of this study can provide valuable references for similar smooth blasting efforts in tunnel engineering.关键词
隧道掘进/光面爆破/聚能装药/冲击起爆/殉爆距离Key words
tunnel excavation/smooth blasting/shaped charge loading/impact initiation/transmission dis-tance分类
信息技术与安全科学引用本文复制引用
石硕龙,周冲,高文学,李卓,张小军..轴向聚能装药结构中乳化炸药合理殉爆距离研究[J].爆破,2025,42(3):78-85,157,9.基金项目
爆破工程湖北省重点实验室开放基金(项目编号BL2021-23) Open Fund of Hubei Key Laboratory of Blasting Engineering(Project No.BL2021-23) （项目编号BL2021-23）
