Tunnel surrounding rock monitoring method based on multifunctional intelligent anchor rod

Abstract

The invention discloses a tunnel surrounding rock monitoring method based on multifunctional intelligent anchor rods. The tunnel surrounding rock monitoring method comprises the steps of: selecting a fracture surface to be monitored for monitoring according to analysis data such as geological conditions of a tunnel, the design of a supporting structure, the surrounding environment, the vulnerability and the like; converging the anchor rods distributed at different positions of the tunnel to a fiber bragg grating demodulator by means of leading-out armored optical fibers to form a monitoring sensor network; and connecting the fiber bragg grating demodulator (which is connected with the anchor rods) with a control computer, and constructing a surrounding rock monitoring system by means of monitoring system software. The tunnel surrounding rock monitoring method is simple and reliable in principle, can be used for testing axial forces and longitudinal distribution situations of the anchor rods to obtain a surrounding rod pressure of the tunnel, and can be used for calculating an deformation amount of surrounding rocks of an excavation surface or an deformation amount of surrounding rocks of a section. The tunnel surrounding rock monitoring method can be applied to the construction monitoring during the excavation of a tunnel adopting a new Austrian tunneling method, and can be applied to tunnel deformation and stability monitoring later during the operation period.

Description

technical field [0001] The invention relates to a bolt-based structural deformation monitoring method for tunnel, foundation pit and slope engineering, in particular to a monitoring method for surrounding rock based on a long-gauge fiber grating-based multifunctional intelligent bolt. Background technique [0002] The new Austrian tunnel construction method (hereinafter referred to as the new Austrian method) was proposed by the Austrian scholar L.V.RABCEWICZ (L.V.RABCEWICZ) in the 1950s. It is based on tunnel engineering experience and the theory of rock mechanics, and is carried out on the basis of practice. A new theory and new concept of tunnel engineering developed. The new Austrian method combines anchor rods and shotcrete as a construction method of the main support means. After many practical and theoretical studies in some countries, it obtained the patent right and officially named it in the 1960s. After that, this method has been developed very rapidly in many un...

AI Technical Summary

Problems solved by technology

These methods have always been common methods for the convergence of tunnel sections, but in practical applications, there are still shortcomings such as manual measurement, large random errors, difficult operation due to harsh environments, and incapable of real-time monitoring.

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