High density surface wave exploration data acquisition and processing method

Abstract

The invention discloses a high density surface wave exploration data acquisition and processing method comprising two parts of data acquisition and data processing. The data processing part is dividedinto preprocessing, waveform processing, frequency dispersion analysis, inversion analysis and visualization processing. The high density surface wave exploration data acquisition and processing method comprises the following concrete steps that S1: data acquisition uses the exploration mode of measuring point encrypting and overlapping, and 24 detectors are arranged on the measuring line according to a certain interval to form a sensor array in the step one. The geotechnical engineering surface wave exploration data acquisition method and processing method and flow are innovated and standardized, including preprocessing, waveform processing, frequency dispersion analysis, inversion analysis and visual display. Meanwhile, the high-precision and multimodal frequency dispersion analysis andinversion analysis method is adopted so that the computing accuracy is high and the effect is great. Besides, the analysis result of each stage is visually outputted so that result interpretation isconvenient and visual.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering geological survey and detection, in particular to a method for collecting and processing high-density surface wave survey data. Background technique [0002] Elastic waves can be divided into surface waves and body waves. Surface waves propagate along the interface between two different media, and are formed by constructive interference of body waves under certain conditions, mainly including Rayleigh waves and Love waves. The Rayleigh wave surface is a cylindrical surface with the excitation point as the center of the cylinder, which has two components, horizontal and vertical, and the vibration track of the particle is an ellipse. Love waves only exist in layered media, and the direction of particle motion is perpendicular to the direction of propagation and parallel to the surface of the medium, with only horizontal components. [0003] The amplitude of the surface wave decay...

AI Technical Summary

Problems solved by technology

[0007] The existing surface wave exploration data acquisition and processing methods have the following defects: the data is collected in units of exploration points, the data density is small, and there is no continuity in space; the exploration results are one-dimensional structures of exploration points, and the continuous distribution of underground structures cannot be obtained ; Dispersion analysis uses the F-K method, which has low accuracy and resolution, does not distinguish between surface wave modes, and the propagation speeds of different modes are mixed in the same dispersion curve; instead of performing inversion analysis, the dispersion curve is used to determine the Inverse deduction of underground structure by empirical formula

Therefore, the calculation accuracy is low, and the physical meaning of the result expression is not clear; the data is manually processed in units of exploration points, which is inefficient, has many human factors, and the results lack objectivity

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