摘要
为解决厚煤顶大断面采动影响巷道围岩稳定性控制的难题,需对其关键影响因素进行系统分析。以同忻煤矿5209回风平巷为研究背景,阐述了采掘接替关系与侧压系数致使巷道围岩失稳的力学机理。将5209回风平巷分为迎采动掘巷、采后掘巷和静压掘巷3个阶段,并用FLAC 3D数值模拟方法,解析了不同掘巷时机、不同侧压系数对巷道围岩稳定性的影响程度。研究结果表明:迎采动掘巷对巷道围岩稳定性的影响最为显著,且采动影响巷道两帮变形呈现出较为显著的不对称性;侧压系数λ>1时,煤柱帮的响应敏感程度最高,水平位移呈迅速增加趋势。
In order to solve a difficult problem to control a stability of the surrounding rock along the large cross section and mining influence gateway with thick seam roof,a systematic analysis was conducted on the key influence factors.Based on No.5209 air return gateway in Tongxin Mine as the study background,the paper stated the mechanical mechanism of the surrounding rock lost stability in the gateway caused by the mining and excavation replacing relationship and the lateral pressure coefficient.No.5209 air return gateway was divided into three stages including the forward mining diving gateway,after mining driving gateway and static pressure driving gateway.The FLAC 3D numerical simulation method was applied to analyze the influence degree of the different gateway driving time and different lateral pressure coefficient to the stability of surrounding rock along the gateway.The study results showed that the forward miming driving gateway would be the most obvious influence affected to the surrounding rock stability of the gateway and the sidewall deformation of the mining influence gateway would be obvious asymmetry.When the lateral pressure coefficient wasλ>1,the response sensitivity degree of the coal pillar would be highest and the horizontal displacement would be highly increased in tendency.
作者
谢福星
王苏龙
袁帅
张杰
XIE Fuxing;WANG Sulong;YUAN Shuai;ZHANG Jie(Beijing China Coal Mine Engineering Company Limited,Beijing 100013,China;Mine Construction Branch,China Coal Research Institute,Beijing 100013,China)
出处
《建井技术》
2021年第2期33-37,共5页
Mine Construction Technology
基金
北京中煤矿山工程有限公司自立科技项目(BMCZL011901,BMCKY011805)
天地科技股份有限公司科技创新创业资金专项(2018-TD-MS012,2019-TD-QN010)。
关键词
厚煤顶
大断面煤巷
围岩稳定性
采动影响
侧压系数
thick seam roof
large cross section seam gateway
surrounding rock stability
mining influence
lateral pressure coefficient
作者简介
谢福星(1988-),男,江苏沛县人,博士,助理研究员。Tel:17701351006,E-mail:17701351006@126.com。
