Variation of Strata Pressure and Axial Bolt Load at a Coal Mine Face Under the Effect of A Fault

作者：Hao Shi, Houquan Zhang, Lei Song, Yin Wu · 发表于：Archives of Mining Sciences · 年份：2023 · DOI：10.24425/ams.2019.128688 · 被引用次数：15 · 研究领域：Geotechnical and Geomechanical Engineering、Rock Mechanics and Modeling、Geomechanics and Mining Engineering

The cohesion and internal friction angle were characterized as quadratic functions of strain and were assumed to follow the Mohr-Coulomb criterion after the yield of peak strength.These mechanical parameters and their variations in post-peak softening stage can be exactly ascertained through the simultaneous solution based on the data points of stress-strain curves of triaxial compression tests.Taking the influence of the fault into account, the variation of strata pressure and roadway convergence with coal advancement, the temporal and spatial distribution of axial bolt load were numerically simulated by FLAC 3D (Fast Lagrangian Analysis of Continua) using the ascertained post-peak mechanical parameters according to the cohesion weakening and friction strengthening model.The change mechanism of axial load of single rock bolt as abutment pressure changes was analyzed, through the comparison analysis with the results of axial bolt load by field measurements at a coal mine face.The research results show that the simulated results such as the period of main roof weighting, temporal and spatial distribution of axial bolt load are in accordance with field measurement results, so the validity of the numerical model is testified.In front of the working face, the front abutment pressure increases first and then decreases, finally tends to be stable.A corresponding correlation exists between the variation of axial bolt load and rock deformation along the bolt body.When encountered by ...