矸石充填夯实工艺模拟及效果分析

Simulation and effect analysis of coal gangue filling tamping process

为了研究夯实工艺对夯实效果的影响规律,采用基于离散元的数值模拟方法建立矸石充填工作面空间模型,以ZC1800/14/25型充填液压支架为研究对象,开展矸石充填体多次推压夯实模拟试验,分析了夯实过程中夯实板压强、接顶率和坡面斜率随时间和夯实次数的动态演化规律,对不同目标夯实角条件下多次推压模拟效果进行了对比分析。研究结果表明:目标夯实角为32°时,前4次推压充填体未接顶而夯实力较小,随后的第5~10次推压夯实峰值压强逐渐升高,夯实效果较好;接顶率伴随每次推压和回撤过程呈现一个“心电”形状,目标夯实角不同时,“心电”形状呈现不同形态;当夯实次数为10时,坡面斜率随夯实次数整体上呈现递增趋势,目标夯实角为32°时,第5次推压后,每一个波峰基本都能达到0.99,夯实效果相对最佳。

In order to study the influence of tamping process on the tamping effect,a spatial model of gangue filling working face was established using numerical simulation based on discrete element method.Taking ZC1800/14/25 filling hydraulic support as the research object,the simulation test of multiple pushing and tamping of gangue filling body were carried out.The dynamic evolution law of the pushing pressure of tamping plate,the top connection ratio and the slope of slope with time and tamping times during the tamping process were analyzed.The simulation results of multiple pushing and tamping under different target tamping angles were compared and analyzed.The results show that backfills are not connected to the top and the tamping force is small during the first 4 thrusting,when the target tamping angle is 32°.The peak pressure values increases gradually during the 5th~10th thrusting,and the tamping effect is better.With each push and retreat process,top connection ratio presents an‘ECG’shape.When the target compaction angle is different,different forms of‘ECG’shape are observed.When the number of tamping times is 10,an overall increasing trend is found in the slope of the slope with the number of tamping times.When the target tamping angle is 32°,the roofing rate finally reaches about 0.99 after the 5th thrusting,and the effect is the best.