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A method for detecting tunnel invert construction quality

A technology of construction quality and detection method, which is applied in the field of engineering geophysical prospecting, can solve the problems of shallow detection depth and unquantifiable inverted arch steel bars, and achieve the effects of obvious difference in wave velocity, improved anti-interference ability, and high resolution of results

Inactive Publication Date: 2018-05-15
WUHAN ENG SCI & TECH RESINST
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Problems solved by technology

Through this invention, it aims to solve the key technical problems faced by the field of inverted arch construction quality, such as shallow detection depth and unquantifiable inverted arch reinforcement

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  • A method for detecting tunnel invert construction quality

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Embodiment Construction

[0023] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0024] A kind of tunnel inverted arch construction quality detection method of the present invention, it comprises the steps:

[0025] Step 1: Perform hammering source excitation on the invert surface of the tunnel invert, and set up a geophone group (24 geophones) arranged along the length direction of the tunnel invert on the invert surface of the tunnel invert. The first geophone is 100-150 meters away from the seismic source, and the geophone group collects the echo signal generated by the hammering seismic source in the tunnel invert;

[0026] Step 2: using the speed difference between the interference wave and the Rayleigh surface wave in the echo signal to eliminate other interference and extract the Rayleigh surface wave signal;

[0027] Step 3: Perform two-dimensional Fourier transform on the collected Rayleigh surface wave signal to o...

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Abstract

The invention relates to a method for detecting tunnel invert construction quality. The method includes 1) performing hammering shock focus excitation on the invert surface of a tunnel invert, and collecting, by a wave detector assembly, echo signals generated by the hammering shock focus in the tunnel invert; 2) extracting Rayleigh wave signals from the echo signals; 3) subjecting the collected Rayleigh wave signals to two-dimensional Fourier transformation to obtain a frequency spectrum and a wave number spectrum; and 4) calculating the phase velocity of the Rayleigh waves according to a relation between Rayleigh wave numbers and frequencies, then performing conversion to obtain a wavelength of the Rayleigh waves, multiplying the phase velocity of the Rayleigh waves by each depth coefficient to obtain a surface wave velocity at each depth of the tunnel invert, and then mapping a frequency dispersion curve of the Rayleigh waves according to the phase velocity of the Rayleigh waves andthe surface wave velocity at each depth of the tunnel invert. A surface wave exploration result obtained by the method is higher in resolution.

Description

technical field [0001] The invention relates to the technical field of engineering geophysical prospecting, in particular to a method for detecting the construction quality of a tunnel inverted arch. Background technique [0002] At present, the main problems in the construction of tunnel inverted arches include insufficient thickness and strength, virtual slag at the bottom of the inverted arch, missing steel bars or excessive spacing of steel bars, etc. These common problems in inverted arch construction will destroy the overall structure of the tunnel, and problems such as inverted arch uplift and lining cracking will occur, leading to serious safety accidents. [0003] The methods of tunnel inverted arch construction quality inspection mainly include geological radar method, core drilling method, acoustic wave method, transient electromagnetic method, ultrasonic rebound comprehensive method, seismic imaging method and infrared detection method, etc. In the actual engine...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04
CPCG01N29/041G01N2291/023
Inventor 周超郭俊峰金彦叶辉刘玉
Owner WUHAN ENG SCI & TECH RESINST
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