延期起爆条件下爆破振动加速度的传播与衰减特性

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[ABSTRACT]Inorderto understand the propagationand atenuation characteristicsofvibrationacceleration in delayed blasting，thecalculationaccuracyand erorinfluencingfactorsofthecenterdiference method wereverified through theoreticalanalysisandsimulationsignal experiments.Theon-site measured blasting vibrationvelocitysignals wereconverted into vibrationacceleration signals.Using multipleon-site blasting vibration monitoringdata，theamplitude，main frequency， average frequencyofblasting vibrationvelocityandacceleration，andthe propagationandatenuationcharacte-risticsof accelerationvibrationlevelunderdiferentdelaytimes werestudied.Theresultsshowthatthereisasignificant diferencein theatenuationofacelerationbetweenthenearandfarblasting zones，andtheatenuationrateof vibrationinthenearblasting zoneis higher thanthatinthefarblastig zone.Thedelaytime hasasignificant impactontheamplitudeofvelocityand acceleration，whileits impactontheattenuationrateisrelativelysmall.Theatenuationratesofvelocityandacceleration are almostthe same under diffrent delaytimes.Asthe distanceincreases，the frequencyshowsatrendoffirstrapidlydecreasing and then slowlydecreasing.Compared to themain frequency，the average frequencyatenuation is more regular.

[KEYWORDS]blasting vibration；central difference method；vibrationacceleration；atenuation characteristic；environmental effect

0 引言

近年来，随着爆破技术在交通、水利、矿石开采等相关领域的广泛应用，爆破作业规模不断扩大，产生的振动环境效应所带来的隐患也随之增多。（剩余15370字）