Dynamic response mechanisms of layered cemented backfill pillars under#br#
horizontal stress wave disturbance of far-field blasting#br#
JIANG Lichun1，2，SU Yong2，DAI Qingsong2#br#
(1. School of Civil Engineering and Transportation，South China University of Technology，Guangzhou，Guangdong 510640，China；
2. Institute of Safety Science and Engineering，South China University of Technology，Guangzhou，Guangdong 510640，China)
Abstract：To study dynamic response mechanisms of layered cemented backfill pillars under the stimulation of far-field blasting，a multi degree of freedom structural response model method of layered backfilling bodies with different cement-sand ratios is firstly established by combining the structural characteristics of layered cemented pillars and its interaction with surrounding rock and backfill. Taking three layered pillars of a copper mine as calculating examples，the stability of the pillar is predicted by comparing the results of numerical simulation and field monitoring，and the action mechanism of different stress wave frequencies is also studied. The results show that the analysing results of the model method are basically consistent with those of numerical simulation and field monitoring under far-field blasting stress wave condition. The cement-sand ratio significantly affects the velocity and displacement response of the backfilling body and determines the responding peak value of the backfilling body. The lower the cement-sand ratio，the larger the vibration period，velocity and displacement response of the layered backfilling body and consequently，the worse the structural stability. The backfilling body with a low cement-sand ratio is the weakest of the pillar structure and is prone to failure. The peak values of the velocity and the displacement response of the backfilling body are obviously affected by the frequency of stress waves，and both them present a single peak with the former lagging behind the latter. At the low frequency state，the vibration period of the backfill pillar increases，and the increase rates of the velocity and the displacement response are lower first and then larger. While the frequency is close to the natural frequency of the backfilling body，resonance phenomenon of the backfilling body occurs and the peak values of the velocity and the displacement response reach their maximums. At the high frequency state，the peak values of the velocity and the displacement response continuously decrease. The research results provide theoretical supports for judging pillar stability of backfilling bodies under the stimulation of far-field blasting.
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2020, Vol. 39 
