Geotechnical displacement amount distributed measuring method

Abstract

The invention discloses a geotechnical displacement amount distributed measuring method. The method include steps: measuring the transmission time of signals in a non-stretched spiral transmission line with a known length by employing a time-domain reflection technology, and obtaining the transmission speed of the signals in the spiral transmission line and a characteristic impedance in the non-stretched state; converting a threshold according to a given characteristic impedance, measuring the characteristic impedance in an operating state until the measured characteristic impedance is greater than the threshold, determining that the stretch occurs, measuring the time of change occurrence of the characteristic impedance and the time for recovery to a normal value, and calculating and obtaining the length of a stretching region; and substituting a measured maximum characteristic impedance in the stretching region into a fitting function to obtain a stretching amount, obtaining the ring number of the spiral transmission line of a stretching interval, and finally obtaining a stretching total amount. The beneficial effects of the method are that the measurement of the geotechnical large stretching amount is realized, and an accurate measuring and monitoring method with easy realization is provided to reduce the harm to mankinds by geological disasters to the maximum.

Description

technical field [0001] The invention relates to the related technical field of geological disaster monitoring and prediction, in particular to a distributed measurement method for rock and soil displacement. Background technique [0002] Although research on the monitoring of disaster hidden danger points has been carried out all over the world, the prediction of geological disasters is still a big problem that people face, and incidents of casualties caused by geological disasters still occur frequently. From the yearbook of address disasters published annually by Chinese statistics, it can be seen that the frequency of geological disasters in China is relatively high every year, and the investment in geological disaster prevention and control has increased year by year in recent years. The monitoring, early warning and prevention of geological disasters are still an important task. In order to effectively control the occurrence of geological disasters, better monitor the ...

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Problems solved by technology

Patent No. 201610560335.8 discloses the establishment of a geotechnical deformation position distribution measurement model based on parallel helical transmission lines. The deformation position is accurately measured by establishing a least squares-support vector machine prediction model. Perform tensile measurement, extract features from the measured data, and obtain eigenvectors. The stretching mechanism of the transmission line, the solution of the characteristic impedance of the transmission line, and the relationship between the characteristic impedance and the stretching amount are not given, while the rock and soil deformation Distributed measurement In addition to measuring the deformation position, more importantly, the measurement method for measuring the amount of stretch and the total amount of stretch is not given

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