面波法在水工隧洞混凝土质量无损检测中的应用

Application of surface wave method for nondestructive testing of hydraulic tunnel concrete

依托引滦入津输水隧洞混凝土边墙衬砌质量检测工程,从频率特性和现场环境下的可操作性等方面优化震源激发方式,优化检波器设置方式,研发出适合水工隧洞快速无损检测的设备和施工方法;对依托工程中的受损水工隧洞进行详细的无损检测,结合工程实际检测数据的处理,研究各种混凝土配合比下的弹性波速度和混凝土抗压强度对应关系,进而综合判断0.1 m范围内混凝土的劣化情况。用面波法对隧洞边墙混凝土进行了检测评价,并与取芯结果进行了比较。结果表明,该方法穿透深度大、不受钢筋影响,能够快速准确地进行水工隧洞混凝土质量的检测。

Relying on tunnel concrete testing of Tianjin Luanhe River Diversion Project,optimized seismic source shooting mode in frequency characteristic and operability under field condition,as well as the setting mode of geophones and array combination relations.We have developed a nondestructive method that provides a 2-D image of the distribution of shear wave velocity of the concrete lining of tunnel.Applied the method to nondestructive testing on the concrete lining of the relying project.Based on the detection data,research the corresponding relationships of elastic wave velocity and compressive strength with kinds of concrete compound ratio.Then,low intensity concrete and defects between 0 and 1 meter had been found by synthetic decision;lastly build the discriminating standard of surface wave nondestructive detecting technology.Compared with existing methods,such as schmidt Hammer and various elastic wave methods,the surface wave method not only gives the surface strength,but also gives its distribution in depth.