远场爆破水平应力波扰动下分层胶结充填体矿柱的动力响应机制

doi:10.13722/j.cnki.jrme.2019.0463

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摘要为研究远场爆破扰动下分层胶结充填体矿柱的动力响应机制，综合分层充填体的结构特征及其与围岩、周边充填体的相互作用，首次构建不同灰砂比的分层充填体多自由度结构响应模型方法，以冬瓜山铜矿3分层矿柱为例进行计算分析，与数值模拟及现场监测的结果进行对比验证，预判其稳定性，并研究不同应力波频率对其作用机制。结果表明：在远场水平爆破应力波作用下，结构响应模型法的分析结果与数值模拟、现场监测结果基本吻合。灰砂比大小严重影响分层胶结充填体的速度、位移响应，及不同灰砂比充填体的响应峰值大小；灰砂比越小，分层充填体振动周期越大，速度、位移响应峰值越大，结构稳定性越差；低灰砂比分层充填体是矿柱结构中的最薄弱区域，容易发生失稳现象。应力波频率明显影响充填体的速度、位移响应峰值，二者变化趋势线均呈“单峰”特征，前者滞后后者出现拐点；在低频阶段，充填体的振动周期增加，二者增加速率先小后大；当频率接近充填体自振频率时，充填体将发生共振现象，二者峰值达到最大值；在高频阶段，二者峰值不断衰减。研究成果为远场爆破扰动下充填体矿柱稳定性判定提供理论支撑。

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	姜立春1
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	苏勇2
	代庆松2

关键词 ：采矿工程, 结构动力响应模型法, 充填体矿柱, 灰砂比, 应力波, 远场爆破

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.

Key words： mining engineering structural dynamic response model method pillar of backfilling body cement-sand ratio blasting stress waves far-field blasting

引用本文:

姜立春1，2，苏勇2，代庆松2. 远场爆破水平应力波扰动下分层胶结充填体矿柱的动力响应机制[J]. 岩石力学与工程学报, 2020, 39(1): 34-44.
JIANG Lichun1，2，SU Yong2，DAI Qingsong2. Dynamic response mechanisms of layered cemented backfill pillars under#br# horizontal stress wave disturbance of far-field blasting#br#. , 2020, 39(1): 34-44.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2019.0463 或 http://www.rockmech.org/CN/Y2020/V39/I1/34

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