大倾角厚煤层综放开采颗粒元分析  

Particle flow analysis on mechanized top-coal caving in steep thick seam

作　　者：王树仁[1] 王金安[2] 刘淑宏[3] 吴顺川[2] 谢俊文[2] 

机构地区：[1]燕山大学建筑工程与力学学院,秦皇岛066004 [2]北京科技大学土木与环境工程学院,北京100083 [3]东北大学秦皇岛分校,秦皇岛066004

出　　处：《北京科技大学学报》2006年第9期808-811,817,共5页Journal of University of Science and Technology Beijing

基　　金：高等学校博士学科专项科研基金(No.20040008025)

摘　　要：应用PFC2D计算程序,对某矿水平与倾斜联合布置的折线型综采面,分析了散体顶煤和破碎直接顶的落放过程及落放形态,揭示了不同放煤步距连续推进模式下的煤损动态特征,并对不同放煤顺序的顶煤回收率及支架受力工况进行了优化分析.研究表明:折线型综采面采用自上而下的回采顺序,顶煤回收率高,支架受力均匀;低位单口放煤时,放出体形态向采空区侧偏转;在支架连续推进过程中,煤损形态节律性变化;大倾角厚煤层综放开采,采用中档放煤步距的经济技术效果较好.By using PFC^2D technique, the falling and moving process of top-coal and rock, and the flowing characteristics of loose medium in the process of top-coal caving in steep thick seam were analyzed for the horizontal and inclining compound working face arrangement of a coal mine by different recovering distances. The recovery of top-coal and the force characteristics of the powered supports for the top-coal caving working face by different caving sequences were discussed. The results showed that, firstly, the recovery of top-coal was high and the force characteristic of the powered supports for top-coal caving was good by adopting the top-to-down caving sequence. Secondly, the falling and moving configuration of loose medium was deflected toward the mined direction. Thirdly, the characteristic of lost coal in the process of top-coal caving was present with a particular rhythm. At last, the optimal caving distance was 1.2 m in all the conditions.

关 键 词：大倾角厚煤层 综采放顶煤 散体介质 运移特征 数值模拟 

分 类 号：TD823.21[矿业工程—煤矿开采]