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两体结构是冲击地压和煤与瓦斯突出的基本结构,采用FLAC3D模拟软件中的硬化软化模型,较为全面地探讨了各力学几何参数对两体岩石结构破坏的影响。首先,利用塑性剪切应变等值线图,模拟首次呈现了两体结构冲击失稳过程中的弹性回跳和应变局部化现象。模拟结果表明,强度差异是发生冲击失稳破坏的必要条件,硬体变形模量的增加使其冲击能量减弱。其次,模拟研究了一体两介质和两体结构单轴压缩失稳破坏的区别,发现增加界面强度可以减缓两体结构的冲击性。最后,不同的高度比及高径比的模拟表明,两体岩石结构的冲击失稳只在一定的高径比范围内发生(硬体>0.05,软体>0.5),且在相同的软体高度下,动态破坏时间随高度比的增加而减小,即破坏的突然性增加。
The two-body structure is the basic structure of rock burst and coal and gas outburst. By using the softening and softening model in FLAC3D software, the influence of geometrical parameters of various mechanics on the failure of two-body rock structure is discussed. First, the plastic shear strain contour map is used to simulate the elastic bounce and strain localization in the bimodal structure. The simulation results show that the difference in strength is a necessary condition for the occurrence of impact instability damage, and the increase of the deformation modulus of the steel weakens the impact energy. Secondly, the difference between uniaxial compression instability of two media and two-body structure is studied by simulation. It is found that increasing the interfacial strength can reduce the impact of two-body structure. Finally, the simulation of different height ratios and height-diameter ratios shows that the impact instability of the two-body rock structure occurs only within a certain range of height-diameter ratio (hardness> 0.05, software> 0.5) and at the same software height , The dynamic failure time decreases with the increase of height ratio, that is, the sudden increase of damage.