三峡工程建基面岩体弹性波检测技术

ELASTIC WAVE DETECTING TECHNIQUE OF FOUNDATION ROCK MASS OF TGP

长江三峡水利枢纽是一个举世瞩目的世纪性工程,它的开工建设,标志着我国水电事业的成熟与发展。三峡工程规模巨大,技术复杂,设计单位针对该枢纽各建筑物的特点,提出了工程建设质量标准及技术要求,而这些要求在某些方面高于国家及部颁规范和标准,三峡工程建基面岩体弹性波检测技术即是其中之一。它利用完整岩体与缺陷岩体的物性差异,采用与建基面平行和垂直两个方向的弹性波观测方式,评价建基面岩体一定深度(一般为5m)范围内岩体的完整性情况,从而为枢纽基础开挖验收提供了岩体定量物性依据。三峡枢纽建基面岩体弹性波检测技术全面覆盖了基础开挖工程,历时八年,这在中国水电建设史乃至世界水电建设史上都是绝无仅有的。同时,也大大促进了用弹性波方法评价岩体质量技术的进步。由于是第一次将弹性波检测技术大范围地应用于水电工程基础验收工作中,从建基面岩体弹性波检测技术要求、检测基本理论及方法技术、典型成果分析等方面,介绍了该项技术在三峡工程中的应用和效果。作为水电工程基础验收新方法的初步总结,抛砖引玉,以求方法的完善,更好地运用于工程建设,为国民经济建设服务。

The three gorges project is a worldfamous project, it's construction indicates the mature and development of hydroengineering in China. According to the characteristics of the TGP (large scale and complication in technology), the designer raise construction criterion and technical requirement and some of them, include Elastic wave detecting technique on foundation rock mass of TGP, are higher than state regulations.By detecting the differences between the good rock mass and defected one and observing the elastic wave velocity in two directions (horizontal and vertical), this method can evaluates the integrated condition of rock mass within depth of 5 meters, provides quantity basic for foundation excavation acceptance check.Elastic wave detecting technique on foundation rock mass of TGP covers all foundation excavation area and has been applied for 8 years, which is unique in the history of hydroelectric construction in China even in the world. It is also the first time to use this technique in a wide range for foundation excavation acceptance check of hydroelectric project. It promotes the advance of rock mass evaluation technique.Technical requirement, basic principal and measures, typical results of the method are presented in this paper and applied effects in TGP are also introduced. With the initial summarizing this new technique for foundation acceptance check of hydroelectric project, we hope others will come up with valuable opinions to improve this method and to be better service engineering construction of our nation.