Research and application of comprehensive detection methods for pipeline crossing karst sections
Early identification of the development status of karst fissures is necessary for the pipeline crossing project,providing a reference for the design of crossing engineering.Though cross-hole elastic wave tomography and electromagnetic wave tomography methods have obvious advantages in investigating karst fissures,they are limited by the simplification and multiple solutions of the single inversion.This article proposes a new joint inversion method involving elastic wave CT and electromagnetic wave CT,which overcomes the above problems with an easy operation process and stable convergence.The technical path of this method includes equivalently converting electromagnetic wave observation field strength data into elastic wave travel time and performing joint iterative inversion with elastic wave data.Numerical simulations prove its ability to more accurately image karst caves having a diameter of only one-tenth of the hole spacing than single inversion.In practical applications,the three-dimensional joint CT inversion is conducted based on 16 pairs of elastic wave data and 13 pairs of hole electromagnetic wave data,accurately depicting the space distribution of karst fissures development.
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