TESTING STUDY ON CONTROL STANDARD OF VIBRATION FOR LAYERED ROCK SLOPE BLASTING
顺层岩质边坡的爆破振动控制标准试验研究

Taking the excavation blasting of a layered rock cutting as background,testing study is made for six lamination blasting. The vibration velocities of particles at different positions away from the explosion sources are measured and the rock mass before and after blasting are detected by wave method. Coupling analysis is made on measured results of both vibration velocity and P-wave velocity,The researches show that the wave velocity of rock mass decreases obviously after blast and the decrement rate of wave velocity increases with the particle vibration velocity of slope when the rock mass of slope is of blast-induced lamination. The greater the particle vibration velocity is,the more serious the degree of rock lamination is. When the particle vibration velocity of slope is smaller than a critical value,the lamination of rock mass cant occur. The critical particle vibration velocity is 25.3 cm/s by calculation,which can be used as the control standard of vibration in the layered rock slope blasting.