固体充填采煤沿空留巷顶板下沉力学机理研究

Title

Study on mechanical mechanism of roof subsidence in gob side entry retaining under consolidated backfill mining
作者

权凯刘治成徐向阳刘洋
Author

QUAN Kai，LIU Zhicheng，XU Xiangyang，LIU Yang
单位

中国矿业大学煤炭资源与安全开采国家重点实验室
Organization

State Key Laboratory of Coal Resources and Safe Mining，China University of Mining & Technology,Xuzhou ,China
摘要

基于固体充填采煤上覆岩层移动特征,为分析巷旁支护体和实体煤帮的稳定性,以唐口煤矿9301充填采煤工作面沿空留巷为算例,采用Winkler弹性地基梁理论,建立了固体充填采煤沿空留巷直接顶力学模型,推导出巷旁支护体宽度和实体煤帮的弹塑性区长度计算式。研究结果表明:求算得出影响唐口矿巷道直接顶下沉的3个主要参数值,即当巷旁支护体的弹性地基系数为50 MN/m~3,其宽度为3 m,采空区充填体弹性地基系数为80 MN/m~3时,可较好的控制巷道直接顶下沉;同时结合唐口煤矿9301轨道巷顶底板移近量具体监测结果,顶底板最大移近量仅为213 mm,沿空巷道围岩控制效果良好。
Abstract

Based on the overlying strata movement behavior under consolidated backfill mining method,the stability of support along side the gob side entry and coal wall was analyzed and then the reasonable width of the support and length of the elastic plastic zone in the coal wall were deducted.Based on Winkler elastic foundation beam theory,a beam model in gob side entry retaining under consolidated backfill mining to analyze the mechanics of immediate roof was built.The No.9301 backfill mining working face in Tangkou Coal Mine was selected as the analysis example,where the three key parameters influencing the roof subsidence in the entry were determined,i.e.the elastic foundation coefficient of the support was 50 MN/m3,the width of the support was 3 m and the elastic foundation coefficient of the backfill body in the gob is 80 MN/m3.In such condition,the roof subsidence could be controlled effectively.In the meantime,combined with the monitoring results of convergence between roof and floor in No.9301 roadway of Tangkou Coal Mine,the filed measurement showed that the maximum convergence of roof and floor was 213 mm，the surrounding rock control in the gob side entry was effective.
关键词

固体充填弹性地基梁弹性地基系数巷旁支护体宽度
KeyWords

consolidated backfill mining;elastic foundation beam;elastic foundation coefficient;width of support along side gob entry
基金项目(Foundation)

江苏特聘教授资助项目(苏教师(2015)29号)；江苏省第五期“333工程”培养资金资助项目(BRA2016363)；
相关专题

这篇文章属于沿空留巷理论与技术（13篇）