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Geomechanics and Engineering
  Volume 17, Number 3, February28 2019, pages 295-305

Investigation on the propagation mechanism of explosion stress wave in underground mining
Jiachen Wang, Fei Liu and Jinwang Zhang

    The bedding plane has a significant influence on the effect of blasting fragmentation and the overall performance of underground mining. This paper explores the effects of fragmentation of the bedding plane and different angles by using the numerical analysis. ANSYS/LS-DYNA code was used for the implementation of the models. The models include a dynamic compressive and tensile failure which is applied to simulate the fractures generated by the explosion. Firstly, the cracks propagation with the non-bedding plane in the coal with two boreholes detonated simultaneously is calculated and the particle velocity and maximum principal stress at different points from the borehole are also discussed. Secondly, different delay times between the two boreholes are calculated to explore its effects on the propagation of the fractures. The results indicate that the coal around the right borehole is broken more fully and the range of the cracks propagation expanded with the delay time increases. The peak particle velocity decreases first and then increases with the distance from the right borehole increasing. Thirdly, different angles between the bedding plane and the centerline of the two boreholes and the transmission coefficient of stress wave at a bedding plane are considered. The results indicated that with the angles increase, the number of the fractures decreases while the transmission coefficient increases.
Key Words
    underground mining; geological discontinuity; explosion-induced stress wave; fractures
Jiachen Wang, Fei Liu and Jinwang Zhang: 1.) College of Resources & Safety Engineering, China University of Mining & Technology, Beijing 100083, China
2.) Top-coal Caving Mining Research of Coal Mining Industry, Beijing 100083, China

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