岭澳核电站二期工程基岩爆破安全阈值分析  

Research on vibration safety threshold for rock under blasting excavation

作　　者：夏祥[1] 李海波[1] 李俊如[1] 朱莅[1] 刘博[1] 王晓炜 

机构地区：[1]中国科学院武汉岩土力学研究所,武汉430071 [2]中广核工程有限公司,深圳518031

出　　处：《岩土力学》2008年第11期2945-2951,2956,共8页Rock and Soil Mechanics

基　　金：国家自然科学基金重点项目(No.50439030);国家十一五支撑项目(No.2006BAB04A06)资助

摘　　要：核电站基础爆破开挖过程中必须严格控制岩体爆破损伤深度,确保建基面安全。以广东岭澳核电站二期工程基础爆破开挖为例,通过现场爆破振动监测、岩体声波试验以及数值模拟,综合分析了岩体爆炸振动衰减规律和损伤特征,研究了距爆源一定距离处岩体振动速度与损伤特征的关系,提出了岭澳核电站二期工程岩体爆炸损伤深度的控制方法,确定了相应的安全阈值。分析结果表明,岭澳核电站二期工程基础爆破开挖时,当距爆源30m处的岩体质点振动速度不超过5cm/s时,可保证下卧基岩的损伤深度小于2m,确保建基岩完整性。Damage should be controlled in order to ensure the safety of bedrock under blasting excavation in nuclear power plant. For this case, blasting vibration, sonic wave test and numerical simulation are employed to study the wave attenuation in rock mass and blasting induced damage under blasting excavation at Ling＇ao Nuclear Power Station （LNPS） in Guangdong Province of China. The relationship between damage characteristic and peak particle velocity （PPV） at a certain distance from the charge are suggested. The method and the vibration safety threshold to control the damage depth for bedrock under blasting excavation are then presented. It is reported that when the PPV at 30 m from charge is not beyond the safety threshold of 5 cm/s, the damage depth of the bedrock will not exceed 2 m. The method and the safety threshold presented can ensure the safety of bedrock under blasting excavation in the project.

关 键 词：安全阈值 爆破振动 损伤 核电站 爆破 

分 类 号：TU751.9[建筑科学—建筑技术科学]