CAJ | 학술논문

利用地震工程中应用较为成熟的反应谱理论对精确毫秒延时控制爆破地震进行研究,设计开展了边坡爆破开挖相似模型试验,分析了不同毫秒延时对爆破地震反应谱特性的影响,考虑结构密集振型间相互影响,结合完全二次项组合法( CQC)求得结构反应总效应值. 结果表明:短毫秒延时控制爆破地震反应谱曲线体现为多峰值特性,且峰值对应周期范围窄,通常在几毫秒区间内;随孔间毫秒微差的增加,反应谱峰值对应结构自振频率逐渐降低,愈趋接近构筑物自振频率,不利于构筑物安全;合理孔间延期时间选取时,应综合考虑爆破振动强度、岩体爆破效果和构筑物动力效应特性3个方面因素;试验条件下,合理孔间延期时间为2 ms.
이용지진공정중응용교위성숙적반응보이론대정학호초연시공제폭파지진진행연구,설계개전료변파폭파개알상사모형시험,분석료불동호초연시대폭파지진반응보특성적영향,고필결구밀집진형간상호영향,결합완전이차항조합법( CQC)구득결구반응총효응치. 결과표명:단호초연시공제폭파지진반응보곡선체현위다봉치특성,차봉치대응주기범위착,통상재궤호초구간내;수공간호초미차적증가,반응보봉치대응결구자진빈솔축점강저,유추접근구축물자진빈솔,불리우구축물안전;합리공간연기시간선취시,응종합고필폭파진동강도、암체폭파효과화구축물동력효응특성3개방면인소;시험조건하,합리공간연기시간위2 ms.
The response spectrum theory widely applied in earthquake engineering was employed to investigate blasting seismic wave induced by controlled blasting with precise delay time interval. The similar model test of slope excavation was de-signed and carried out. The influence of different millisecond delay to response spectrum property was analyzed. Considering the interaction between intensive modes,the modal combination was conducted combined with method of second item combination completely (CQC) to obtain total effect value of structural response. The results shows that,the response spectrum curves of controlled blasting with short millisecond delay have multiple distinct peak points,and the corresponding period is usually with-in a narrow range of a few milliseconds. With the increase of milliseconds delay between blasting holes,the natural frequency corresponding to response spectrum peak gradually close to the natural frequency of structures,which is detrimental to the safe-ty of the structure. Choosing of reasonable delay time interval should comprehensively consider blasting vibration intensity,blas-ting effect of rock mass and dynamic response of construction. Under experimental conditions,the reasonable delay time interval between blasting holes is 2 ms.