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首页> 外文期刊>International Journal of Rock Mechanics and Mining Sciences >Study of automated top-coal caving in extra-thick coal seams using the continuum-discontinuum element method
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Study of automated top-coal caving in extra-thick coal seams using the continuum-discontinuum element method

机译：连续铝内膜元素法研究超厚煤层自动化顶煤洞穴研究

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摘要

In order to investigate top-coal drawing regularity and automated top-coal caving technology in extra-thick coal seams, an approach coupling the particle element and the block element is presented based on the continuum-discontinuum element method (CDEM). Then, the constitutive model of hydraulic support is introduced into the CDEM to simulate the top-coal drawing process. Meanwhile, the Bergmark-Roos model for coal drawing of single support is extended into the collaborative coal drawing of multiple supports to optimize the automated top-coal caving technology. Finally, CDEM models of hydraulic support, armored face conveyer and coal-rock strata are established according to the field conditions of the "Tongxin Coal Mine". Then, the top-coal drawing mechanism is analyzed, and an automated top-coal caving technology is proposed. The results show that under the interaction between hydraulic support and surrounding rocks, the final drawing body of initial top-coal drawing appears as an irregular, deflected ellipsoid shape. During different support-moving cycles, the coal-rock structure affects the coal drawing amount and support resistance. A statistical comparison of the coal-rock drawing amount based on 100 drawing openings indicates that the standard deviation of the coal drawing amount in automated, one-round coal caving is 1.83 m(2) less than that in traditional coal caving (8.23 m(2)), and the coal drawing amount from each drawing window is more uniform. For multi-round coal caving techniques, the average recovery rate remains at 79.4% and the rock mixed rate is less than 1%. Based on a comparison of several coal caving techniques, automated four-round coal caving technology is the optimal technology, in which the change rate of the standard deviation of the coal drawing amount as well as the top-coal recovery rate are both largest.
机译：为了研究厚厚的煤层中的顶煤拉伸规律和自动化顶煤崩落技术，基于连续的终止蛋白元素法（CDEM）提出了一种耦合粒子元件和块元件的方法。然后，将液压支撑件的本构体载体模型引入CDEM以模拟顶煤绘制过程。同时，单个支架的煤型煤型锦标印型号延伸到多个支撑件的协同煤绘，以优化自动化的顶煤露天技术。最后，根据“通信煤矿”的现场条件建立了液压支撑，装甲面输送机和煤岩地层的CDEM模型。然后，分析了顶煤拉伸机构，提出了一种自动化的顶煤露天技术。结果表明，在液压支撑和周围岩石之间的相互作用下，初始顶煤绘图的最终拉伸体看起来是不规则的偏差椭球形状。在不同的支撑移动循环期间，煤岩结构影响煤拉伸量和支撑性。基于100个绘图开口的煤岩绘图量的统计比较表明，煤拉伸量在自动化中的标准偏差为1.83米（2）比传统煤洞（8.23米（ 2）），每个绘图窗口的煤拉伸量更均匀。对于多圆形煤脉冲技术，平均回收率保持在79.4％，岩石混合率小于1％。基于几种煤落技术的比较，自动化的四圆形煤矿技术是最佳技术，其中煤绘量的标准偏差的变化率以及顶煤回收率都是最大的。

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