大采高综放工作面沿空留巷柔模墩柱充填体参数确定及应用  

Determination and Application of Filling Body Parameters of Flexible Moulded Pier Columns for Gob-side Entry Retaining in Fully Mechanized Caving Face with Large Mining Height

作　　者：董红娟 刘亚琳 吴周康 姜小龙 张耀耀 从日盛 DONG Hongjuan;LIU Yalin;WU Zhoukang;JIANG Xiaolong;ZHANG Yaoyao;CONG Risheng(School of Mining and Coal,Inner Mongolia University of Science and Technology,Baotou 014010,China;Inner Mongolia Key Laboratory of Mining Engineering,Baotou 014010,China;Inner Mongolia Research Center for Coal Safety Mining and Utilization Engineering and Technology,Baotou 014010,China;Inner Mongolia Cooperative Innovation Center for Coal Green Mining and Green Utilization,Baotou 014010,China;Laoshidan Coal Mine,CHN Energy Wuhai Energy Co.,Ltd.,Wuhai 016099,China;Liaoning Institute of Chemical Geological Exploration Co.,Ltd.,Jingzhou 121007,China)

机构地区：[1]内蒙古科技大学矿业与煤炭学院,内蒙古包头014010 [2]内蒙古自治区矿业工程重点实验室,内蒙古包头014010 [3]内蒙古自治区煤炭安全开采与利用工程技术研究中心,内蒙古包头014010 [4]内蒙古煤炭绿色开采与绿色利用协同创新中心,内蒙古包头014010 [5]国家能源集团乌海能源有限责任公司老石旦煤矿,内蒙古乌海016099 [6]辽宁省化工地质勘查院有限责任公司,辽宁锦州121007

出　　处：《金属矿山》2024年第12期52-59,共8页Metal Mine

基　　金：内蒙古自治区直属高校基本科研业务费项目(编号:2023QNJS093);内蒙古自然科学基金项目(编号:2022LHMS05007)。

摘　　要：针对大采高综放工作面沿空留巷围岩动压扰动强、稳定性控制难度大等特点,以老石旦煤矿16402综放工作面为工程背景,采用理论分析、数值模拟及工程实测的方法,分析了大采高综放条件下巷道失稳特征。以此建立了综放沿空留巷顶板与充填体相互作用力学模型,确定了柔模墩柱支护阻力。并利用FLAC3D数值模拟软件分析了不同柔模墩柱宽度、间隔条件下,沿空留巷围岩应力分布及变形规律。研究结果表明:随着柔模墩柱宽度的增加和间隔的减小,墩柱内垂直应力峰值不断降低,顶板下沉量不断减小,顶板下沉逐渐由非对称分布向对称分布演变。综合沿空留巷围岩应力、变形规律和经济因素,确定16402综放工作面柔模墩柱宽度为2 m,间隔为1 m。方案经过实施后观测发现,沿空留巷顶板最大下沉量为329 mm,煤帮部最大移近量为217 mm,墩柱最大移近量为25 mm,留巷围岩基本保持稳定,可为相似工程提供借鉴。In view of the characteristics of strong dynamic pressure disturbance and difficult stability control of surrounding rock in gob-side entry retaining of large mining height fully mechanized caving face,taking 16402 fully mechanized caving face of Laoshidan Coal Mine as the engineering background,theoretical analysis,numerical simulation and engineering measurement are adopted.Firstly,the instability characteristics of roadway under the condition of large mining height fully mechanized caving are analyzed.Based on this,the mechanical model of interaction between roof and filling body of gob-side entry retaining is established,and the support resistance of flexible moulded pier columns is determined.The stress distribution and deformation law of surrounding rock of gob-side entry retaining under different width and interval of flexible moulded pier columns are analyzed by FLAC3D numerical simulation software.The results show that with the increase of the width of the flexible moulded pier column and the decrease of the interval,the peak value of vertical stress in the pier column decreases continuously,the roof subsidence decreases continuously,and the roof subsidence gradually evolves from asymmetric distribution to symmetrical distribution.Based on the stress,deformation law and economic factors of surrounding rock in gob-side entry retaining,the width of flexible moulded pier column in 16402 fully mechanized caving face is determined to be 2 m and the interval is 1 m.After the implementation of the scheme,it is found that the maximum subsidence of the roof of the gob-side entry retaining is 329 mm,the maximum displacement of the coal side is 217 mm,and the maximum displacement of the pier column is 25 mm.The surrounding rock of the gob-side entry retaining is basically stable,which can provide reference for similar projects.

关 键 词：煤矿综放开采 沿空留巷 柔模墩柱 数值模拟 

分 类 号：TD353[矿业工程—矿井建设]