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Analysis and Numerical Simulation of Hydrofracture Crack Propagation in coal-rock Bed

Computer Modeling in Engineering & Sciences 2015年第5期105卷 69-86页

作者： Yiyu Lu Chenpeng Song Yunzhong Jia Binwei Xia Zhaolong Ge Jiren Tang Qian Li State Key Laboratory of coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400030China

In underground coal mines,hydrofracture can cause the increase of breathability in the fractured coal *** the hydrofracture crack propagates to the interface between the coal bed and the roof-floor stratum,the crack may enter roof-floor lithology,thus posing a limit on the scope of breathability increase and making it difficult to support the roof and floor board for subsequent coal *** this work,a two-dimensional model of coal rock bed that contains hydrofracture crack was *** an investigation that combines the fracture mechanics and the system of flow and solid in rock failure process analysis(RFPA2D-Flow)were carried out to study the failure mechanism at the interface between rocks and coals,and critical water pressure that hydrofracture crack *** results indicated that the main factors that affect the direction of hydrofracture crack propagation are the angle of intersection between coal-rock interface and horizontal section,horizontal crustal stress difference,tension-shear mixed crack fracture toughness in coal-rock interface and differences in elasticity modulus of coal-rock *** possibility of crack directly entering coal-rock interface would increase with the increase in angle of intersection or horizontal crustal stress *** trend that crack propagates along the coal-rock interface will become stronger with the decrease of the fracture toughness at the coal-rock interface and the increase of the elasticity modulus difference between the coal bed and the roof *** results of this study was to put forward a method of controlling hydrofracture crack,optimize the fracturing well location provides a certain theoretical basis.

关键词： Hydrofracture crack propagation coal-rock interface coal mine

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Deformation analysis of transversely isotropic coal-rock mass with porous and cracks

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International Journal of Mining Science and Technology 2012年第6期22卷 814-820页

作者： Xue Dongjie Zhou Hongwei Kong Lin Tang Xianli Zhao Tian Yi Haiyang Zhao Yufeng School of Mechanics Architecture and Civil EngineeringChina University of Mining & Technology

coal-rock as a typical sedimentary rock has obvious stratification,namely it has transversely isotropic ***,deformation leads to coal-rock mass having the characteristics of different porous and crack structures as well as local *** axial and circumferential strain' formulas of the pure coal-rock mass specimen with a single crack were derived through the establishment of equivalent mechanical model of standard cylindrical coal-rock specimen,and have been widely used to a variety of media combined different structures containing multiple *** complete stress strain curve of a real coal-rock specimen was obtained by the CTC ***,according to the comparison with the theoretical value,the theoretical mechanical model could well explain the deformation characteristics of coal-rock mass and verify its ***,following features were analyzed:strain normalized coefficient and elastic modulus(Poisson's ratio) in vertical and parallel direction to the stratification,stratification angle,porosity,pore radius,normal and tangential stiffness of crack,and the relationship of different crack width with different tangential stiffness of *** the analysis above,it substantiate this claim that the theoretical model with better reliability reflects the transversely isotropic nature of the coal-rock and the local anisotropy caused by the porous and cracks.

关键词： coal-rock mass Transversely isotropic Porous and crack Mechanical model

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Influence of cyclic dynamic disturbance on damage evolution and zoning effect of coal-rock under local static load constraint

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Geohazard Mechanics 2023年第4期1卷 263-276页

作者： Yihong Liu Hongbao Zhao Aiwen Wang Lianpeng Dai Yue Li Hongwei Zhang Institute of Disaster rock Mechanics Liaoning UniversityShenyang110036China School of Energy and Mining Engineering China University of Mining&Technology-BeijingBeijing100083China

In order to obtain the characteristics of the effects of cyclic impact loading on the damage of coal-rock in the presence of a local static load constraint,the evolution of the damage factor and the fracture rate during the process and incremental cyclic impact on raw coal and briquettes has been *** results show that the presence of local static load restraint improves the impact resistance of the coal-rock,and the damage factor of the coal-rock shows obvious zoning *** the coal-rock is in an elastic state,the partition with a larger static load restraint area has stronger impact resistance,when the coal-rock is in a plastic state,the partition with a larger static load restraint area has a weaker impact *** impulsive cyclic impacts have a higher damage efficiency to coal-rock than constant impulsive cyclic *** difference in rock breaking efficiency between the two cyclic impact methods is mainly reflected in the partition with the largest constrained *** crack propagation on the coal-rock surface is more consistent with the partition characteristics of the damage *** the static load constrained zone is in an elastic state,the static load has an inhibitory effect on the crack *** the static load confinement zone is in a plastic state,the cracks mainly propagate in the static load confinement zone,and the constrained zone mainly consists of tensile cracks that grow in the vertical direction,while the cracks in the non-constrained zone mainly grow in an oblique ***,fracture mechanics was applied to analyze the failure type of the sample.

关键词： coal-rock Local static load constraint Cyclic impact Damage factor Crack growth

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