Method and system for detecting elastic wave velocity of rock component

Abstract

The invention relates to a method and a system for detecting the elastic wave velocity of a rock component. The method includes the steps: coupling a transmitting transducer with a receiving transducer by the aid of the rock component; exciting the transmitting transducer by the aid of linear frequency modulation encoding signals; receiving detection signals Srock by the aid of the receiving transducer; performing related functional operation for matched filtering signals Smatch and the detection signals Srock in a real number field to obtain pulse compression signals Scompress (n) with a single peak value; and calculating the arrival time of head waves of elastic waves according to the peak time delta t of the pulse compression signals Scompress (n). The receiving transducer receives the matched filtering signals Smatch when the transmitting transducer is directly in butt joint with the receiving transducer. The problem that head waves of elastic waves are difficult to distinguish when background noise is high in the prior art is solved, the elastic wave velocity of rocks can be precisely detected, and the head waves of the elastic waves can also be detected for the component in a long distance.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for detecting elastic wave velocity of rock components and a system for detecting rock components. Background technique [0002] Rock elastic wave velocity is one of the important parameters to study the law of elastic wave propagation in rock mass and to study the dynamic measurement methods of various physical and mechanical parameters of rock mass, and it is also an important parameter to evaluate the quality of geotechnical engineering construction. [0003] The existing elastic wave velocity detection method is to arrange transducers at both ends of the rock block, and generate a pulse signal (sine pulse or rectangular pulse) through the trigger circuit of the acoustic wave transmitter, and the pulse signal emits elastic waves into the rock block through the transmitting transducer. Wave, elastic wave propagates in the rock body and is received by t...

AI Technical Summary

Problems solved by technology

[0004] However, in the field detection process of the existing technology, sometimes the first wave and the noise signal are aliased due to the background noise interference, and even the first wave is completely submerged in the noise signal. Therefore, in this case, it will be difficult to judge The arrival time of the first wave of the elastic wave

Moreover, when detecting longer rock components in the prior art, the amplitude attenuation of the elastic wave after a long distance is greatly attenuated, so it is difficult to distinguish the head wave of the elastic wave in the received signal

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