Numerical simulation of stress wave propagation in coal-rock combination media

Xue Dongjie●Zhou Hongwei●Liu Jiadun●Yi Haiyang

Abstract

By establishing numerical simulation model of SPBH and comparing dynamic response of four kinds of coal-rock combination media subjected to three different stress waves, changes law of the reflected wave, incident wave, strain and strain rate were obtained. The results show that rock-rock combinationhas almost the same rules of reflected waves as rock-coal combination, coal-coal combination and coal-rock combination, while the coal-coal combination has the largest peak of reflected wave, followed by the coal-rock combination and the rock-coal combination, and the rock-rock combinationranks last. With increasing incident wave peak, the coal-rock combination weakens the peak more apparently. Strain softening occurs in coal samples under stress wave of peak value 50MPa with the law that strain rate firstly increases, and then maintains a constant value, continues to increase and then decreases, increases reversely and then decreases. Constant strain rate of the phenomenon over time occurs. The results provide guidelines for both the study on propagation mode of stress wave in coal and rock combination media and the prevention of mining-induced dynamic disasters.

引用格式：

Xue DJ, Zhou HW, Liu JD, Yi HY. Numerical simulation of stress wave propagation in coal-rock combination media[A]. In：2012 Global Conference on Civil, Structural and Environmental Engineering&3rd International Symposium on Multi-field Coupling Theory of Rock and Soil Media and Its Applications[C]. Switzerland：Trans Tech Publications: Advanced Materials Research, 2012. 542–551.

SCI：WOS-000319084400104   EI：123456789   

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