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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >APPLICATION OF TRAVELTIME TOMOGRAPHY METHODS TO IMAGING A DAM SITE
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APPLICATION OF TRAVELTIME TOMOGRAPHY METHODS TO IMAGING A DAM SITE

机译：行车断层扫描方法在大坝现场成像中的应用

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摘要

The four tomography methods have been developed according to the rectangular and triangular cell/grid parameterizations. In the formulations, it is particularly emphasized to guarantee the non-negative property of the matrix D. The property benefits the application of the weighting matrices constructed from the inversion information to stabilizing the tomographic solutions. For the respective parameterizations, the efficient developments of the corresponding ray tracing procedures have been given to make the ray tracing parameterization consist with the linear reconstruction one. The weighted least squares solution to tomography is obtained via conjugate gradient type algorithm. The use of these methods has been illustrated with a real example from cross-hole traveltime tomography experiment. The results based on the four parameterizations are little different, and are in good agreement with the field investigations. The velocity distribution in the cross-hole region provides an important insight into the object between the holes and is very useful for the post-work at the site.
机译：根据矩形和三角形单元/网格参数设置，已经开发了四种层析成像方法。在配方中，特别强调要保证矩阵D的非负特性。该特性有利于将由反演信息构成的加权矩阵应用于稳定层析成像解决方案。对于各自的参数化，已经给出了相应的射线追踪程序的有效发展，以使射线追踪参数化与线性重构一致。层析成像的加权最小二乘解是通过共轭梯度类型算法获得的。这些方法的使用已通过跨孔走时层析成像实验的真实示例进行了说明。基于这四个参数化的结果几乎没有什么不同，并且与现场调查非常吻合。跨孔区域的速度分布为洞之间的物体提供了重要的洞察力，对于现场的后期工作非常有用。

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