深厚淤泥爆破挤淤振动效应

依托某核电站取水明渠超过30 m厚淤泥爆破挤淤展开研究,探索深厚淤泥层爆破振动传播规律、影响因素及其振动效应。首先对振动反射波和折射波的能量分配原理进行了论述,对深厚淤泥层条件下不同爆破工况振速衰减规律、频率分布进行了分析,通过高低潮位的对比,说明厚覆盖海水对能量的传播起到了较好的耗散作用,炸药能量在两种工况下的利用率没有明显区别,主频主要集中在低频区间。最后将爆破挤淤与土石方爆破对比分析,说明爆破挤淤能量转化为地震波的比例更高,主因是装药结构的差异导致能量转化率存在较大差别。

Analysis of vibration effects to deep and thick silt by blasting compaction

Since the blasting compaction technology has been successfully applied to the civil engineering in the 80s of the last century in China, there are very few in studies of the deep and thick silt blasting compaction, such as the energy transfer theory and the tide level under the blasting working conditions in comparison with soil rock blasting. When there are sensitive buildings or structures in the blasting area, making studies of the vibration effects of blasting has a practical significance. This paper, depending upon a nuclear power station, carries out researches of thick silt over 30 m in the intake channel by blasting compaction, including studies of propagation rule of vibration, influence factors and vibration effects by blasting. Firstly, the analysis of energy distribution of the vibration induced reflected wave and refracted wave has been done in this paper; secondly, analysis of the damping laws of vibration rates and frequency of the north and south banks has made under the different blasting conditions. Compared with the high and lower tidal levels, the analysis results show that the thick seawater covering the silt has a positive effect on the energy dissipation, and there are no great differences between the explosive energy utilization under two working conditions. The main frequency mainly concentrates at the low frequency area. Finally comparing the blasting compaction with the soil rock blasting, and it is found that the energy ratio of the blasting compaction which transfers to a seismic wave is higher, the main reason is the discrepancy of the explosive structure which leads the energy transfer ratio having remarkable differences.