仰斜综放开采顶煤运移规律及合理放煤参数研究  

Study on top-coal migration law and reasonable top-coal caving parameters in fully-mechanized top-coal caving face

作　　者：王圣志 袁永[1,2] 朱成 袁超峰 钟慧伟 WANG Shengzhi;YUAN Yong;ZHU Cheng;YUAN Chaofeng;ZHONG Huiwei(School of Mines,China University of Mining and Technology,Xuzhou 221116,China;State Key Laboratory of Coal Resources and Mine Safety,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221116 [2]中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221116

出　　处：《煤炭科学技术》2022年第5期104-109,共6页Coal Science and Technology

基　　金：国家重点研发计划资助项目(2018YFC0604701)。

摘　　要：为研究不同倾角的煤层在放煤过程中顶煤的运移规律和确定合理的放煤参数,采用PFC^(2D)颗粒流软件模拟济宁二号煤矿10301工作面不同倾角下的顶煤运移规律,并结合现场实测确定合理的放煤参数,得到了采放比、放煤步距、仰采角度对顶煤放出率的影响规律。结果表明:仰采角度越大,顶煤从初始位置运移到放煤口的位移距离越长;仰采角度越大,顶煤运移轨迹形成“倒勺子”形状就越明显,放煤过程中顶煤越容易向采空区运移,顶煤放出率越低;随着支架倾角的增加,顶煤在运移过程中与支架相互作用形成的“力链拱”、成拱效应越明显;济宁二号煤矿10301工作面的最佳采高确定为3.5 m,最佳放煤步距为0.8 m,最佳采放比为1:3,确定最佳放煤含矸率为7%;现场实测与模拟结果相近,验证数值模拟的可行性。In order to study the migration law of top-coal in top-coal caving process of top-coal caving in coal seams with different dip an⁃gles and determine the reasonable coal caving parameters,PFC^(2D) particle flow software was used to simulate the top-coal migration law under different dip angles of No.10301 working face of Jining No.2 Coal Mine.Combined with the field measurement method,the reasona⁃ble coal-discharging parameters was determined,and the influence law of the caving ratio,the coal caving step distance and the angle of the mining on the top-coal release rate were obtained.The results show that the larger the angle of the mining,the longer the displacement distance of the top-coal from the initial position to the coal inlet;the larger the vertical mining angle is,the longer the displacement dis⁃tance of the top-coal from the initial position to the coal opening;the easier it is for the top-coal to move to the gob,the lower the release rate of the top coal;with the increase of the inclination of the support,the"force chain arch"effect formed by the interaction between the top-coal and the support during the migration process is more obvious;the optimal mining height of the No.10301 working face of Jining No.2 Coal Mine is determined to be 3.5 m,the optimal top-coal caving step distance is 0.8 m,the optimal mining and caving ratio is 1∶3,and the optimal coal caving gangue ratio is determined to be 7%;the simulation results are similar,verifying the feasibility of numerical simulation.

关 键 词：仰采 综放开采 煤层倾角 顶煤运移路径 含矸率 

分 类 号：TD823[矿业工程—煤矿开采]