取水隧洞内外爆破振动安全分析

为确保核电工程前期取水隧洞的顺利建设和后期核岛及附属结构的安全运营,对广东台山核电站取水隧洞爆破开挖过程中其内部与地表的振动进行测试。根据隧洞内部与地表处设置的振动监测点与开挖面的距离不同,爆破振动测试过程中的监测点可分为3个区域。通过分析不同区域地下及地表的质点峰值振动速度传播规律发现:不同区域质点峰值振动速度随比例药量的增加整体呈增大的变化趋势;对于距离爆源较近的区域,隧洞内部的振动速度大于地表振动速度,而距离爆源较远区域其地表的振动速度大于隧洞内部的振动速度。另外,随爆源距的增加,地表振动衰减系数逐渐减小,而隧道内部衰减系数逐渐增加。因此,对于具有多项控制要求的浅埋地下隧道工程爆破,应分区域进行地下、地表振动监测,以达到控制爆破振动安全的要求。

Blasting vibration safety analysis of underwater tunnel inside and outside

In order to ensure the successful construction of underwater tunnel in the early stage of the nuclear power project and the safe operation of the nuclear power station in the later stage, the internal and surface vibration of the underwater tunnel was tested during the blasting excavation process of Taishan nuclear power station in Guangdong province. According to the distance between the vibration monitoring points inside the tunnel and the ground surface and the excavation face, the monitoring points in the blasting vibration testing process can be divided into three regions. By analyzing the propagation law of the particle peak vibration velocity in different regions, it was found that the particle peak vibration velocity in different regions presented an overall increasing trend with the increase of proportional charge. For the region close to the detonation source, the vibration velocity inside the tunnel is greater than that on the ground surface, while the vibration velocity on the ground surface in the region far from the detonation source is greater than that inside the tunnel. In addition, the attenuation coefficient on the ground surface decreases gradually with the increase of the distance to detonation sources, while the attenuation coefficient inside the tunnel increases gradually. Therefore, for underground blasting engineering with multiple control standards, underground and surface vibration monitoring should be carried out in different regions to meet the requirements of blasting vibration safety control.