Crosshole ultrasonic tomography and its application to karst investigation  

作　　者：刘红桂 刘建达 许汉刚 宋文荣 

机构地区：[1]Seismological Bureau of Jiangsu Province, Nanjing 210014, China

出　　处：《Acta Seismologica Sinica(English Edition)》2003年第4期441-448,共8页

基　　金：Joint Seismological Science Foundation of China (602013).

摘　　要：Crosshole ultrasonic tomography is referred to ray tracing by griding method and image reconstruction by combining the successively linearized iteration with damping least-squares QR decomposition, with which the result has better precision than that with crosshole seismic tomography by using the same inversion method in engineering geological investigation. It has been proved in practice that the investigation with crosshole ultrasonic tomography can clearly show the location and shape of the abnormal geological unit with the volume more than 60 cm when the crosshole distance exceeds 30 m. The result of investigation has been confirmed by the drilling. The crosshole ultrasonic tomography method will be extensively used in the engineering geological investigation.Crosshole ultrasonic tomography is referred to ray tracing by griding method and image reconstruction by combining the successively linearized iteration with damping least-squares QR decomposition, with which the result has better precision than that with crosshole seismic tomography by using the same inversion method in engineering geological investigation. It has been proved in practice that the investigation with crosshole ultrasonic tomography can clearly show the location and shape of the abnormal geological unit with the volume more than 60 cm when the crosshole distance exceeds 30 m. The result of investigation has been confirmed by the drilling. The crosshole ultrasonic tomography method will be extensively used in the engineering geological investigation.

关 键 词：ULTRASONIC TOMOGRAPHY karst investigation + 

分 类 号：P631.5[天文地球—地质矿产勘探] P642.25[天文地球—地质学]