Study on the dissipation mechanism of shock and vibration energy in a stress release area of deep roadway

Abstract

Stress release through artificial blasting is often used in deep roadways to prevent rock-burst, but the results in many coal mines are unsatisfactory since the dissipation mechanism of shock and vibration energy influenced by the rupture structure of the coal and rock mass in the stress release area is unclear. In this paper, the surrounding deep roadway rock is divided into three parts, which are the stress concentration area, the stress release area and the anchor area. The stress release area produced by artificial blasting consists of spherical rupture units, and these units can be divided into the crush zone, rupture zone and fracture zone from inside to outside. The attenuation coefficient of the high energy stress wave that propagates from the intact area and stress release area to the anchor area is obtained based on the simplified model of normal incidence impact energy. The numerical simulation method is used to research the dynamic variation of vertical stress, elastic strain energy and the plastic zone of the surrounding rock under the action of shock and vibration energy, and the dissipation law of shock and vibration energy in the stress release area is revealed. Field application shows that setting the stress release area artificially can reduce the impact of shock and vibration energy on the anchor supporting system and improve the rock-burst prevention capability of the anchor