摘要
为研究采场周围瓦斯运移规律,在考虑上覆岩层压实应力恢复过程的基础上,采用数值模拟方法获得了采动过程中上覆岩层垂直应力的空间分布情况;划分了采动应力集中壳及卸压体,并采用自行编制的FISH语言,获得了采空区围岩应力集中壳的三维空间形态特征、采空区围岩应力卸压体及压实应力恢复体的形态特征及演化过程;结合不同工作面开采条件,获得了三维应力卸压体变形过程及其相互影响的机理;通过三维模型重构,将卸压体形态导入COMSOL Multiphysics数值模拟软件,针对3种不同通风形式,获得了采空区上方三维应力卸压体内瓦斯运移及富集规律。研究认为,采用U型通风条件下,进风口侧采空区瓦斯体积分数稀释较快,采空区内形成明显的"扇形"稀释区域,工作面上隅角出现明显瓦斯富集。采用沿空留巷方式实现Y型通风及U型通风+高抽巷能够有效改善工作面瓦斯环境。
In order to study the gas migration in the mine stope, considering the recovering compaction stress of overlaying strata, the distribution of vertical stress in overlying strata over mine goaf was ana- lyzed by using numerical simulations. The concept of mine-induced stress concentration shell and the pressure relief body is presented. By using FISH, the three-dimensional shape characteristics of stress concentration shell in surrounding rock over the goaf and the shape and evolutionary characteristics of stress relief body and compacted zone are obtained. According to different mining conditions in working face, the deformation process and interaction mechanism of the stress relief body in mine goaf are also gained. Through the three-dimensional model reconstruction, the shape of stress relief body was imported to COMSOL Multiphysics numerical simulation software. Rules of gas migration and accumula- tion in coal and rock strata are obtained for three different ventilation pattern. The results show that： the gas concentration in air intake entry of mine goal dilutes fastest. There is a ＂fan-shaped＂ diluting area in goaf and the gas apparently gathers in the upper comer of working face when using U-type ventilation pattern. The Y-type or U-type ＋ high level gas drainage roadway could effectively solve the gas problem in mine working faces.
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2018年第1期155-162,共8页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51474039,51404046)
河北省教育厅科学研究计划项目(QN2015069)：邯郸市科技局计划项目(1521109072-7)
关键词
应力集中壳
应力卸压体
三维围岩形态
瓦斯运移
stress concentration shell
stress relief body
three dimensional surrounding rock
gasmigration
作者简介
洛锋（1985-），男，河北省唐山市人，博士，硕士研究生导师，从事矿山压力与岩层控制、矿井灾害防治等方面的研究。E—mail：flu0527@hebeuedu．cn Tel：15033106678
