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深入研究爆生自由面对边坡微差爆破诱发振动峰值的影响,对爆破方案优化和安全控制具有重要指导意义。通过白鹤滩水电站边坡多段微差爆破试验,对同排第一段和后续段的爆破诱发振动进行对比分析,并采用SPH-FEM耦合方法,对同排不同段爆破的岩体破碎过程和诱发振动进行模拟。研究表明,在岩体条件和单段药量相同的前提下,爆生自由面对爆破诱发振动峰值有显著影响,多段微差爆破中同一排第一段爆破所诱发的振动幅值比后续段爆破的更大。在多段微差爆破设计过程中需要考虑爆生自由面的影响,从控制爆破振动的角度,同一排的不同段的控制药量并不相等,应适当减小同一排第一段爆破的段装药量。
Studying deeply the impact of free surface explosion on the vibration peak induced by millisecond blasting is of great guiding significance for blasting scheme optimization and safety control. The blast induced vibration of the first and subsequent sections of the same row are compared and analyzed by multi-step micro-blasting tests at the slope of Baihetan Hydropower Station. SPH-FEM coupled method is used to analyze the crushing process and induced Vibration simulation. The results show that under the condition of the same mass of rock mass and single section, the free surface of free burst has a significant influence on the vibration peak induced by blasting. The amplitude of vibration induced by the first burst of the same row in the multi-stage micro- Explosion more. In the process of multi-stage micro-differential blasting design, the influence of free surface of free-blast must be considered. From the point of view of controlling blasting vibration, the controlled doses in different sections of the same row are not equal and should be properly reduced in the first stage of blasting Dosage.