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Triaxial compression behavior of large-scale jointed coal: a numerical study

International Journal of Coal Science & Technology 2022年第5期9卷 81-95页

作者： Xiaoqing Wang Fuqiang Gao CCTEG Coal Mining Research Institute BeijingChina Mining&Designing Branch China Coal Research InstituteBeijingChina State Key Laboratory of Coal Mining and Clean Utilization(China Coal Research Institute) BeijingChina

Accurate estimation of the triaxial compression behavior of jointed coal is essential for coal *** studies addressed the triaxial compression behavior of large-scale rock mass,especially with real joint *** employed a numerical synthetic rock mass(SRM)method to study the triaxial compression behavior of jointed ***-coal specimens were constructed based on in-situ joint measurements and microparameter calibration against laboratory experiments.A series of triaxial compression tests under different loading orientations and confining pressures were numerically performed to obtain joint and confining-pressure effects on the triaxial compression behavior and reveal the failure mechanism of jointed *** suggest that the triaxial compression behavior of the jointed coal has strong joint and confining-pressure *** weaken the strength and elastic modulus,reduce the lateral deformation,and affect the geometries of the shear-rupture *** increase in the confining pressure causes the peak and residual strength increase *** an increase in the confining pressure,the elastic modulus increases sharply at low confining pressure,the mechanical behavior transitions from brittleness to ductility,the failure mode transitions from shear-rupture surface to plastic flow,and the joint effect diminishes and even *** jointed coal fails by means of a shear-rupture surface under triaxial compression loading with a confining pressure(which is not too high),and the geometries of the shear-rupture surface vary with the distribution of joints.

关键词： Jointed coal Triaxial compression synthetic rock mass Failure mode

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Numerical analysis on the factors affecting post-peak characteristics of coal under uniaxial compression

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International Journal of Coal Science & Technology 2024年第1期11卷 42-60页

作者： Zhiguo Lu Wenjun Ju Fuqiang Gao Taotao Du CCTEG Coal Mining Research Institute BeijingChina State Key Laboratory of Coal Intelligent Mining and Strata Control(China Coal Research Institute) BeijingChina

The post-peak characteristics of coal serve as a direct reflection of its failure process and are essential parameters for evaluating brittleness and bursting *** the significant factors that influence post-peak characteristics can offer valuable insights for the prevention of coal *** this study,the synthetic rock mass method is employed to establish a numerical model,and the factors affecting coal post-peak characteristics are analyzed from four perspectives:coal matrix mechanical parameters,structural weak surface properties,height-to-width ratio,and loading *** research identifies four significant influencing factors:deformation modulus,density of discrete fracture networks,height-to-width ratio,and loading *** response and sensitivity of post-peak characteristics to single-factor and multi-factor interactions are *** result suggested that feasible prevention and control measures for coal bursts can be formulated through four approaches:weakening the mechanical properties of coal pillars,increasing the number of structural weak surfaces in coal pillars,reducing the width of coal pillars,and optimizing mining and excavation *** efficacy of measures aimed at weakening the mechanical properties of coal is successfully demonstrated through a case study on coal burst prevention using large-diameter borehole drilling.

关键词： Post-peak behavior synthetic rock mass Coal bursts Coal burst prevention

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