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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。
In order to explore the deformation and failure of coal and rock under variable axial compression and the evolution of gas seepage, coal samples compressed by raw coal and pulverized coal were taken as research objects. A three-axis servo- Coal Triaxial Compression and Gas Seepage Test Under Different Axle Pressure Loading Paths. The results show that the deformation of coal can be divided into four stages of compaction, stable development, instability rupture development and rupture. The rate of strain change of compaction stage is mainly related to open structure plane and fracture, Although the loading rates at different stages are not related to the loading intervals, the axial strain rates are basically the same in the same axial compression loading range at the steady development stage. The permeability of coal and the axial loading rate are negatively correlated The rate of change of permeability in the middle and later stages was not related to the loading rate of axial compression. The conclusions of the study are of great significance to guide rockburst and monitoring and early warning of coal and gas outburst.