长江科学院院报2019，Vol.36Issue(12)：169-172,4.DOI:10.11988/ckyyb.20181334
基于能量衰减系数的弹性波CT反演
Elastic Wave CT-based Inversion of Attenuation Coefficient
摘要
Abstract
With reference to the energy attenuation of electromagnetic wave CT, we present a method for the attenu-ation inversion of elastic wave CT in an attempt to improve the unsatisfying efficiency of velocity inversion in detec-ting underground boulders. The square value of the first arrival peak of direct wave was regarded as the waveform energy value. First of all, the coefficient of holistic attenuation in the triangle medium between the single stimula-tion source and all geophones was calculated after distance correction and normalization processing. Subsequently the coefficient of linear attenuation in the medium from the source to each geophone was calculated according to the fitted relative error. The attenuation coefficient section was then obtained by inversion to be taken as the basis of abnormal discrimination. Practical application of this method to the exploration of boulders in the airport line of Wuhan Metro proves that inversion of attenuation coefficient is more sensitive to small defects than velocity inver-sion. The relative extreme difference of attenuation coefficient is larger than that of velocity, hence is more condu-cive to abnormal discrimination.关键词
弹性波CT/归一化/孤石/速度反演/衰减系数反演Key words
elastic wave CT/normalization/boulder/inversion of wave velocity/inversion of attenuation coeffi-cient分类
天文与地球科学引用本文复制引用
徐复兴,刘海涛,熊友亮,吴蒙蒙..基于能量衰减系数的弹性波CT反演[J].长江科学院院报,2019,36(12):169-172,4.基金项目
国家重点研发计划项目(2018YFC1508602) （2018YFC1508602）
