【摘要】 井间超声波CT技术采用网格法进行射线追踪 ,应用逐次线性化迭代与带阻尼最小二乘QR分解相结合的方法进行图象重建 .该技术应用于工程地质勘察领域 ,能够达到采用相同反演方法的井间地震波CT技术所无法达到的勘察精度要求 .工程实践证明 ,对于井间距超过 30m的情况 ,超声波CT能分辨大于 6 0cm的地质异常体 .此方法在工程地质勘察领域具有广阔的应用前景更多还原

【Abstract】 Crosshole ultrasonic tomography is referred to raytrace by gridding method and rebuild image by combining successive linearization iteration with damping LSQR, with which the resolution has better precision than that with crosshole seismic tomography by using the same inversion method, in engineering geologic development. It has been proved in practice that the investigation with crosshole ultrasonic tomography can clearly show the location and shapes of the abnormal geologic unit with resolution less than 60 cm, the result of investigation has been confirmed by the drilling. The crosshole ultrasonic tomography method will be extensively used in application of engineering geologic development.更多还原