Method and system for detecting elastic wave velocity of rock component

An elastic wave and component technology, applied in the field of geotechnical engineering, can solve the problems of large background noise interference, difficult to distinguish the elastic wave head wave, large amplitude attenuation, etc., and achieve the effect of increasing the detection distance

Inactive Publication Date: 2012-08-22
INST OF ACOUSTICS CHINESE ACAD OF SCI
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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

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  • Method and system for detecting elastic wave velocity of rock component
  • Method and system for detecting elastic wave velocity of rock component
  • Method and system for detecting elastic wave velocity of rock component

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Embodiment Construction

[0021] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0022] Figure 7 Shown is the system for detecting elastic wave velocity of rock components according to an embodiment of the present invention, which includes: a control device including a signal generator, a signal transmitting channel, and a signal receiving channel for generating signals and storing and displaying signals; A transducer, which is excited by the chirp coded signal from the signal transmission channel of the control device, converts the chirp coded signal into a vibration signal, and transmits the vibration signal to the rock component; the receiving transducer, which receives The elastic wave from the rock-like component is converted into a detection signal S rock ; Computing equipment, which is used to match the filter signal S match with the detection signal S rock Perform the correlation functi...

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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...

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Application Information

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IPC IPC(8): G01H5/00G01N29/07
Inventor 李长征
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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