Stability monitoring of roadway surrounding rock under blasting vibration

WANG Xinguo; HE Yanpeng

doi:10.11799/ce202311040

Abstract：Aiming at the impact of blasting vibration in open-pit coal mines on the safety production of surrounding mines,taking the main roadway of Shangwan Coal Mine in Shendong mining area 20 m away from the northern boundary of Wujiata Open-pit Coal Mine as the research background,the roadway surrounding rock acoustic wave was monitoring technology was used in the roadway side acoustic test holes arranged in several blasting concentrated areas in the central part,and the test sections were respectively arranged in the surrounding rocks on the blasting face and the back blasting face.Four measuring holes are arranged at each test point,and the hole spacing is 1.5 m.The surrounding rock of the roadway in Shangwan Coal Mine was monitored in real time,and the analysis results show that,the surrounding rock properties of the roadway along the drilling hole are significantly different,and with the increase in the number of blasting operations and the approaching blasting distance,the intensity of blasting vibration gradually increases;The sound velocity analysis of the blasting vibration shows that the integrity of the surrounding rock has a slight deterioration in the nature of the surrounding rock,and the low-frequency and low-frequency components account for a large proportion,but the range of deterioration is within a reasonable range,and the roadway is stable;The damage increment is smaller than that of the surrounding rock on the blast-facing side of the roadway,which means that the damage degree of the surrounding rock on both sides is relatively small.In order to ensure the roadway stability,subsequent blasting operations should be carried out in strict accordance with the vibration reduction blasting plan.