煤岩体突水通道骨料灌注运移堆积机制试验

Experimental on Migration and Stacking Mechanism of Filling Aggregate in Water Inrush Coal Mine Channel

为揭示突水通道中骨料运移堆积的演化规律,开展了动水条件下骨料灌注试验,得到了骨料的初始沉积位置、堆积体形成方向以及堆积体极限堆积高度与水流速、骨料灌注速度等影响因素的内在关联。结果表明:在1.0 m/s高流速动水环境中,骨料堆积体形成方向为先逆水流方向生长至投料孔底后转为顺水流方向生长;在0.3 m/s低流速条件下,采用口径36 mm漏斗投料同口径18 mm相比,骨料灌注总量相同时,其堆积体的极限高度提升了41%。基于数值力学模型——计算流体动力学-离散元方法(computational fluid dynamics and distinct element method,CFD-DEM),研究了骨料灌注期间突水通道内流场的时空分布特征以及骨料堆积体的过水阻力作用对突水通道内静水压力的影响机制。

To quantitatively analyze the evolution process of the transportation and accumulation of aggregates in the water inrush channel,aggregate perfusion experiments under dynamic water conditions were carried out,and the inherent correlations between the initial deposition position,the formation direction,the maximum accumulation height,and influencing factors such as water flow rate and aggregate filling speed were obtained.The result shows that under a high flow rate dynamic water environment of 1.0 m/s,the initial formation direction of aggregate is first against the movement of water flow and then turned to the tip of water flow after growing to the bottom of the filling hole.Under the same injection amount,compared with using an 18 mm funnel,the maximum height of the accumulation can be increased by up to 41%by using a 36 mm filling funnel.Based on the two-phase flow coupling calculation model by CFD-DEM(computational fluid dynamics and distinct element method),the spatiotemporal distribution characteristics of the flow field during aggregate perfusion and the influence mechanism of the overwater resistance of the accumulation on the static water pressure in the water inrush channel were studied.