掘进爆破振动作用下支护结构的安全距离

he effect of tunneling blasting seismic waves on the surrounding rock and supporting structure is an important research content in underground engineering and structural seismic. Based on the characteristics of the blasting seismic wave displacement potential function, using the method of separation of variables, the equations of surrounding rock particle motion under an axis coordinate system is solved and the variation law of the particle velocity of surrounding rock with the axial distance, the radial distance and time is given. The results show that: the particle vibration velocity of surrounding rock caused by blasting seismic wave attenuates rapidly, and is inversely 1/2, 3/2 proportional to distance; Severe attenuation of vibration velocity appears on the axial distance, and the supporting structure away from the head face a shorter range is vulnerable to the impact of blasting vibration. According to blasting vibration safety velocities in accordance with the surrounding rock and supporting structure, the safe distances for the blasting vibration in different blasting methods are determined, this provides a theoretical basis for the choice of the tunnel blasting scheme and the distance of the empty top.