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摘要: 基于刚体极限平衡法及等效加速度计算方法,根据爆破振动峰值速度衰减规律和振动速度时程曲 线,以一定时间步长进行整个爆破过程不同时刻边坡稳定系数的分析,得到了相应爆破振动作用下的边坡动 力稳定性安全系数时程曲线。结果表明,基于等效加速度的边坡爆破动力稳定性分析,对稳定性较好的边坡, 爆破振动荷载作用下,稳定性安全系数一般降低2%~4%,振动主频率越高,则边坡稳定性系数越大,而常规 的折减系数法可能放大爆破振动对边坡稳定性的危害。Abstract: Basedonthelimitequilibrium methodforrigidblockandtheequivalentaccelerationmethod, accordingtotheattenuationprincipleofthepeakblastingvibrationvelocityandthetimehistory ofthevelocity,thetime-historycurveofthedynamicstabilitysafetyfactoroftheslopeunderblastingvibrationwasobtainedbyanalyzingthewholeblastingvibrationpr cessatacertaintimestep.Analysisindicatesthatfortheslopeswithbetterstability, thesafetyfactorisgenerallyreducedby2% to4% underblastingvibration,andthehigherthemainfrequencyis,thegreaterthestabilitysafety factoris.Whiletheregularreductionmethodmayenlargetheblastingvibrationharmfulnesstothe slopestability.
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Key words:
- mechanicsofexplosion /
- safetyfactor /
- limitequilibrium method /
- blastingvibration /
- equivalentacceleration /
- rockslope
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