Continuous and automatic measuring apparatus and method of surrounding rock wave velocity structure in tunneling process of TBM

Abstract

The invention provides a continuous and automatic measuring apparatus and method of a surrounding elastic wave velocity structure in a tunneling process of a TBM. The method includes: a plurality of hydraulic telescoping rods are fixed on a TBM horizontal support; the hydraulic telescoping rods stretch out and enable detectors to be fixed to a surrounding rock wall through a certain pressure during construction step-changing of the TBM, and the position of each contact measuring point is recorded; when the pressure between the detectors and the surrounding rock wall reaches a predetermined value, a small hammer knocks the surrounding rock wall, the detectors receive surface wave signals transmitted through surrounding rocks, and a data continuous recording system realizes continuous and automatic record of surface waves; the hydraulic telescoping rods are contracted to the horizontal support after one time of measurement and move forwardly for a certain distance with the horizontal support, the distance is less than or equal to the length of one group of detectors, and the above process is repeated during step change of the TBM once again; and waveform processing and dispersion analysis of the acquired surface waves are performed, and the elastic wave velocity structure in a medium is finally speculated through an underground structure analysis.

Description

technical field [0001] The invention relates to the continuous and automatic measurement and test of the elastic wave velocity structure of the surrounding rock during the excavation process of the TBM tunnel, and is particularly suitable for analyzing the wave velocity changes caused in different tunnel surrounding rock regions during the excavation process of the TBM. Background technique [0002] Rock mass can be approximated as an elastic medium, which will move and deform when subjected to the action of an external force field, and this deformation will propagate in the medium in the form of elastic waves. According to the theory of elasticity, the relationship between wave velocity and elastic parameters in a medium is: [0003] [0004] [0005] Where: V P P-wave velocity; V S Shear wave velocity; E modulus of elasticity; μ Poisson's ratio. [0006] It can be seen from the above formula that the propagation speed of waves in rock mass is related to the densit...

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Problems solved by technology

[0021] In order to solve the problems of low resolution of measuring the elastic wave velocity of the surrounding rock in the prior art, the influence of the tunnel construction environment on the result, the installation and disassembly of the device and the relatively cumbersome measurement methods, the present invention provides a method for measuring the elastic wave velocity of the surrounding rock during TBM excavation. Construct continuous automatic measuring device and method

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