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中文摘要：
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。
英文摘要：
Studies on the influence of blast-created flee face on ground vibration in slope blasts with millisecond-delays are very significant for optimization and safety control in blasting excavation. A multiple-row bench blast test at Baihetan Hydropower Station was conducted to compare the. blast-induced ground vibration from the first and followed delay in the same row. A SPH-FEM coupled model was also developed to simulate the fragmentation process and the blasting vibrations from different delays in the same row. The simulated results agreed well with the experiment results. If the charge weight and the blasting geometry parameters were the same in each blast delay, the ground vibration induced by the first delay will be larger than that of the followed one. The study indicated that the effect of the blast-created free face should be considered in the blasting design. From the perspective of vibration control, the charge weight of the first delay in every row should be less than that of the followed delays in the same row.
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