不同因素下隧道初期支護爆破動力響應(yīng)特性

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中圖分類號：U419.3 文獻標(biāo)識碼：A DOI： 10.7525/j.issn.1006-8023.2025.03.020

Abstract：Thedynamicresponse characteristicsofthe initial supportunderblasting willafecttheconstruction safety and schedule.In order to study the dynamic responsecharacteristicsof tunnel initial support under diferent factors， combined with thetunnel blasting projectofforestfarm，the vibrationvelocityand stressdistributionlaws of tunnel initialsupportundertheinfluenceofage，footagelengthanddetonationtimeinterval wereanalyzedbycombining field monitoring and numerical simulation，and Moris screening method was introduced to analyzethe influence degree of each factor. The results show that the peak vibration velocity of the initial support presents V>Vxruleunderdifferent penetrationlength，age and detonation time interval，andthe tensile stress is much larger thantheshearstress.The vibrationvelocityandstressoftheinitialsupportchangesharplyduringtheageof1-3d，andgraduallytendtobeflatafter 7 days，the attenuation rate of the x -axisis the largest，followedby the z -axis，and the y -axis is the smallest.With the increase of footage length，the growth rate of particle vibration velocity presents a rule of the y -axisis thelargest，followed bythe x -axisand the z -axis.When the detonation time interval is 5ms，the stress waves cancel each otherand the vibration velocity decreases.Thedegree of influenceof the thre factors on the dynamic response characteristicsofstructural blasting isin theorderoffootage length，age，andblasting interval.Theresearch resultscan provide reference forsimilar tunnel blasting projects.

Keywords：Highway tunnel; blasting；initial support；dynamic response；numerical simulation

0 引言

鉆爆法是巖質(zhì)隧道開挖經(jīng)濟合理、應(yīng)用最廣泛的一種手段，而且在未來一段時間這種情況不會有太大改變[1-3]。（剩余14142字）