摘要
为减少回采工作面所留设的煤柱损失和缓解掘进和回采作业接替的紧张关系,基于理论分析、现场实测资料,提出一种自适应荷载巷旁支护体(墩柱)进行沿空留巷技术方法。通过建立沿空留巷围岩力学模型,推导出沿空留巷巷旁支护阻力的理论计算公式,并经现场矿压监测,分析研究了沿空留巷试验巷道在回采期间的围岩变形特征、墩柱受力及变形特征。结果表明:在墩柱式沿空留巷中,巷道顶底板、两帮变形量最大值分别为400、310 mm,变形后断面积能满足通风和巷内瓦斯抽采的空间需求;墩柱最大压力为25.4 MPa,墩柱最大下缩量为256 mm,既在墩柱的承载能力范围内,又满足前期切顶与后期支护的要求,可缩性墩柱支护体能在沿空留巷中取较好的留巷效果。
In order to reduce the coal pillar lost of the coal mining face and to release the tension relationship of the gateway driving and the coal mining operation,based on the theoretical analysis and the site measured information,the paper provided a gateway retained along goaf technical method with the support（ pier pillar） of the self suitable loaded gateway sidewall. With the establishment of the surrounding rock model of the gateway retained along goaf,a theoretical calculation formula of the sidewall support resistance was derived. With the monitoring and measure of the mine site strata pressure,the paper had an analysis and study on the deformation characteristics of the gateway retained along goaf during the coal mining period and the pier pillar stressed and deformation characteristics. The results showed that in the pier pillar,gateway retained along goaf,the max deformation values of the roof and floor of the gateway and the two sidewall deformation value would be400 and 310 mm individually. After the deformation,the cross section of the gateway could fully meet with the space requirements of the ventilation and the gateway gas drainage. The max pressure of the pier pillar was 25.4 MPa and the max shrink value of the pier pillar was 256 mm. With the loading capacity scope of the pier pillar,the requirements of the initial roof cutting and the late support also could be met and the yield pier pillar support would have good gateway retained effect in the gateway retained along goaf.
出处
《煤炭科学技术》
CAS
北大核心
2018年第1期81-87,共7页
Coal Science and Technology
基金
国家重点研发计划资助项目(2017YFC0804200)
国家自然科学基金资助项目(51274204)
教育部新世纪优秀人才支持计划资助项目(NCET-12-0965)
北京市教委科研计划一般资助项目(KM20150853002)
关键词
沿空留巷
可缩墩柱
围岩活动规律
矿压监测
gateway retained along goaf
yield pier pillar
surrounding rock activity law
mine strata pressure monitoring and measuring
