Method for identifying types of underground superficial heteroplasmon based on surface spectrum disturbance characteristics

Abstract

The invention discloses a method for identifying the category of an underground shallow heteroplasmon based on surface spectrum disturbance characteristics, which comprises the following steps: arranging a reference measuring line near a heteroplasmon suspicious region, performing two-dimensional Fourier transform on a test signal to obtain a frequency-wave number domain spectrum, and obtaining an average phase velocity through a spectrum ridge line; then, performing one-dimensional Fourier transform on a test signal of a test point to obtain an offset-frequency domain spectrum cloud picture, and converting the offset-frequency domain spectrum cloud picture into an offset-wavelength domain spectrum cloud picture as a reference spectrum cloud picture according to an average phase velocity; setting a test line in a suspicious area to obtain a test spectrum cloud picture, comparing the test spectrum cloud picture with a reference spectrum cloud picture, spectrum cloud picture characteristics disturb corresponding wavelengths and offsets to pre-estimate the burial depth and position of the heteroplasmon, and identifying the category of the heteroplasmon by relatively weakening or enhancing the spectrum intensity. According to the method, the offset-wavelength domain surface wave field spectrum cloud picture is obtained through a group of surface measuring point vibration response signals, and the perturbation characteristics of the spectrum picture are analyzed, so that the orientation and the burial depth of the heteroplasmon can be estimated, and the category of the heteroplasmon can be identified.

Description

technical field [0001] The invention relates to the technical field of underground shallow heterogeneous body detection in geotechnical engineering or municipal engineering, and in particular to a method for identifying the category of underground shallow heterogeneous bodies based on surface wave spectrum disturbance characteristics. Background technique [0002] In geotechnical engineering or municipal engineering, air-filled or water-filled underground air-raid shelters, caves, pipes, soft soil, silt, etc. are often encountered. The shear wave velocity (or stiffness) of these heterogeneous bodies is lower than that of the surrounding medium, and they are soft bodies. Heterogeneous bodies such as floating stones and concrete blocks have higher rigidity than the surrounding medium and are hard bodies. When the site contains soft or hard materials, it will affect the construction safety and engineering quality, especially the following risks may exist in the tunnel shield co...

AI Technical Summary

Problems solved by technology

Caves are just a special case of soft bodies. Shallow soft bodies and hard bodies have different surface wave scattering characteristics from caves. Various a

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