作　　者： ; ; ; ; ; (杜文州）;

机构地区： 山东科技大学

出　　处： 《岩土力学》 2016年第S1期175-182,共8页

摘　　要： 为探究煤岩在变轴压加载下的变形破坏和瓦斯渗流演化规律,以原煤煤粉压制的煤体试件为研究对象,采用含瓦斯煤热流固耦合三轴伺服渗流试验系统,进行了5种不同轴压加载路径下的煤体三轴压缩及瓦斯渗流试验。研究结果表明,煤体变形可分为压密、稳定发展、非稳定破裂发展和破裂后4个阶段;压密阶段试件的应变变化速率主要与张开性结构面和裂隙有关,与轴压加载区间无关,稳定发展阶段虽然轴压加载速率不同,但在相同的轴压加载区间,轴向应变变化速率基本相同;变轴压加载前期煤体渗透率与轴压的加载速率呈负相关变化,中后期渗透率变化速率与轴压加载速率相关性不大。研究结论对指导冲击地压以及煤与瓦斯突出的监测预警有着重要意义。 To explore the deformation and gas seepage rules of coal and rock under variable axial compression loadings, with coal pulverized coal specimen pressed for the study, using triaxial stress thermal-hydro-mechanical coal containing gas permeability system, five kinds of coal in different axial compressive loading paths under three axial compressions and gas seepage test were carried out. The results show that: Deformation of coal body can be divided into four stages: compaction, stable development, non stable fracture development and fracture. Strain rate of change of the specimen compaction stage mainly related to open structure surface and the fracture and regardless of the axial compressive load range; the stable development stage, while the axial compression loading rate is different, but in the axial compression loading the same interval, variation of axial strain rate is basically the same. The coal permeability and axial compression loading rate is negatively correlated with changes during the variable axial compression loading early stage and the permeability variation rate and axial compressive loading rate and little correlation in the late period. The above conclusions have important significance to guide the monitoring and early warning of rockburst and coal and gas outburst.

关 键 词： 变轴压 应变 变形 瓦斯渗流 渗透率

领　　域： [矿业工程]