摘要
基于矿井留煤柱开采时易出现应力集中,导致巷道围岩控制困难且引起采掘接替紧张的背景,以赵固一矿埋深大、基岩薄等特殊条件下实施无煤柱切顶沿空留巷为例,采用理论分析、数值模拟等方法综合研究特殊条件下的巷道围岩结构演化特征,得出了引起沿空巷道压力大的主要因素是其上覆松散层经薄基岩传递至顶板,并提出通过定向预裂爆破减弱或阻断采空区与巷道上方下位关键岩层间的力学联系,以期达到卸压预裂效果;还提出了切顶留巷关键技术参数,最终实施了现场工程应用。现场试验结果表明:留巷顶底板收缩量717 mm,两帮收缩量471 mm,留巷段滞后工作面180 m后围岩开始趋于稳定;留巷能够满足接替工作面正常生产使用的要求。
Based on the background that the stress concentration is easy to occur in the coal pillar retaining mining,which leads to the difficulty of surrounding rock control and the tension of mining replacement,taking Zhaogu No.1 mine as an example,the evolution characteristics of surrounding rock structure under special conditions are comprehensively studied by theoretical analysis and numerical simulation,it is concluded that the main factor causing the high pressure of gob side entry is that the overlying loose layer is transferred to the roof through the thin bedrock,and the directional presplitting blasting is proposed to weaken or block the mechanical connection between the goaf and the key strata above and below the entry,so as to achieve the effect of pressure relief presplitting;the key technical parameters of cutting roof and retaining roadway are also put forward,and finally the field engineering application is implemented.The field test results show that the shrinkage of roof and floor is 717 mm,the shrinkage of two sides is 471 mm,and the surrounding rock tends to be stable after 180 m behind the working face;retaining roadway can meet the requirements of normal production and use of succeeding working face.
作者
赵社会
张广杰
王文
ZHAO She-hui;ZHANG Guang-jie;WANG Wen(Jiaozuo Coal Industry Group Zhaogu(Xinxiang)Energy Co.,Ltd.,Jiaozuo 454000,China;Henan Institute of Technology,Henan Polytechnic University,Jiaozuo 454003,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China)
出处
《煤炭技术》
CAS
北大核心
2021年第11期12-17,共6页
Coal Technology
基金
国家自然科学基金(51604093)。
关键词
薄基岩
沿空留巷
围岩结构
预裂爆破
顶板
thin bedrock
gob side entry retaining
surrounding rock structure
presplitting blasting
roof