Micro-motion acquisition method

Abstract

The invention provides a micro-motion acquisition method, which comprises the following steps of S1, connecting a detector to a seismograph through a cable, and arranging the detector according to design; s2, starting to carry out micro-motion data measurement to obtain micro-motion data of one measuring point or one array; s3, moving the detector to the next measuring point or arranging the detector; s4, repeating the measurement in the steps S2 and S3; s5, measuring signals of each detector are collected, and the distance between the base point and the measuring point is calculated according to the position coordinates of the base point and the measuring point; s6, performing mutual correlation on the measurement data of the base point and the measurement point in a frequency domain to form a gather after mutual correlation; s7, for the arrangement of n detectors, at least (n-3) arranged cross-correlation gathers can be extracted; and S8, extracting a frequency dispersion curve by using the cross-correlation gather, and drawing achievement maps such as transverse wave velocity inversion and the like. According to the invention, through base point measurement, linear arrangement in a work area or cross-correlation of the arrays is realized, the calculation precision of the frequency dispersion curve between the arrays is improved, and the purpose of fine detection is achieved.

Description

technical field [0001] The invention relates to a fretting acquisition method, which is mainly applied to the detection of geological abnormal bodies with obvious density and wave velocity differences between underground media, is suitable for the measurement of underground wave velocity abnormal bodies, and is suitable for goafs, faults, voids, Fine detection of shallow spaces such as boulders, suitable for projects with high requirements for underground structure and structural detection speed, depth and precision. Background technique [0002] The micro-motion method is to use a seismograph to collect vibration signals from natural phenomena such as natural earthquakes, ocean waves, wind, tidal changes, lightning and other natural phenomena or human activities such as mining and mechanical operation, and use the micro-motion signals to carry out geophysical detection of underground structures. method. [0003] The micro-motion detection is to calculate the frequency and ...

AI Technical Summary

Problems solved by technology

The main problems and shortcomings are as follows: (1) The station device is complex and the data collection efficiency is low; (2) It is difficult to deploy the station in areas with complex terrain; (3) The ability to resist fixed vibration interference is poor, and the high frequency near the site Vibration or noise has a great influence on the original data of micro-motion; (4), because the detection depth of micro-motion is proportional to the side length of the array, the detection depth of the array in complex terrain areas is limited

[0005] Due to the characteristics of the device itself, it is difficult to extract the dispersion curve through simple processing using the array and linear devices, and it is difficult to obtain the velocity structure of the real reconstruction of the underground medium

Images