大坝基础开挖中岩石爆破损伤的声波测试技术

摘要

In order to better see the foundation excavation blasting quality,the sound wave test was used to detect the integrity of rock mass,then evaluate the quality of foundation rock excavation. Based on field acoustic measurement,the test signals' acoustic velocity、 waveform and amplitude was firstly analyzed,then evaluated the base surface rock mass quality. Test results show that the maximum and average sonic attenuation rate of single hole and cross holes are not more than 10 percent of the technical requirements for construction, and the rock integrity of the good foundation excavation meet the design requirements and blasting is less impact on the dam.%为更好地了解坝基开挖爆破施工质量,采用声波测试技术检测岩体的完整性,评价建基面岩体开挖质量.基于现场的声波测试,先对声波测试信号中的波速、波形、波幅的变化规律进行了分析,然后对建基面岩体质量进行了综合评价.检测结果表明:单孔、跨孔声波最大和平均衰减率均满足不超过10％的施工技术要求,岩石完整性较好,基础开挖施工符合设计要求,爆破施工对坝基质量影响较小.