文章以某高速公路小净距隧道Ⅴ级围岩下后行洞爆破对先行洞影响为工程背景,通过四个测点(一个三向传感器和三个单向传感器)爆速时程曲线的测定和分析,得出了微差爆破的时差控制、同一测点不同方向爆速和离开掌子面不同距离爆速分布特征,为小净距隧道爆破开挖提供借鉴与参考。 In this paper, the influence of backhole tunnel blasting on grade V surrounding rock with small clear distance tunnel on a freeway is taken as the engineering background. Through the measurement of the detonation time history curve of four measuring points (one three-way sensor and three one-way sensors) and The results show that the control of the time difference of the differential blasting, the detonation velocity distribution in different directions of the same measuring point in different directions and the different distance from the face of the foothold, provide a reference for the blasting excavation of the small clear distance tunnel.