Tunnel initial support stability judging and prediction method based on electromagnetic radiation

Abstract

The invention discloses a tunnel initial support stability judging and prediction method based on an electromagnetic radiation. The tunnel initial support stability judging and prediction method includes the following steps that: S1, as for dangerous section (includes not-to-be-ring section and be-ring section of the initial support) possible to be instable failure of the initial support, monitoring sections are circularly arranged at certain intervals, and electromagnetic radiation monitoring sites are arranged at representative positions of the monitoring sections; and S2, portable electromagnetic radiation monitor is adopted to monitor the intensity of the electromagnetic radiation on the surface of the tunnel initial support of each monitoring site at different period, and normal tunnel deformation monitoring is simultaneously conducted at each monitoring site. According to the tunnel initial support stability judging and prediction method, any equipment does not need to be pre-buried, test in the field is convenient, construction is basically not interfered, testing in a wider range can be conducted, and the method is suitable for being widely adopted in a tunnel project undercomplex geological conditions; and the monitoring results can reflect the relative small and large and changing trend of surrounding rock pressures, and key part of initial support transformation anddeformation, and the basic need of stability analyzing and estimating of the initial support can be met.

Description

technical field [0001] The invention relates to the technical field of tunnels and underground engineering, in particular to a method for identifying and predicting the stability of initial support of tunnels based on the principle of electromagnetic radiation. Background technique [0002] During tunnel construction, primary support yield, instability and failure are caused by surrounding rock deformation and compression of support structure caused by tunnel excavation. The deformation rate of the initial support in a stable state is relatively slow. After local yielding or instability occurs, the deformation rate will gradually increase, and the growth rate will become faster and faster. Eventually, the overall instability or regional instability of the initial support will be caused by local instability. destroy. The instability of the initial support will directly threaten the safety of construction personnel and machines, affect the construction progress, and cause was...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of method based on the principle of electromagnetic radiation to distinguish and predict the stability of tunnel primary support, to solve the problem mentioned in the above-mentioned background technology that the stability, Monitoring and judging the degree of stability, and the existing judging methods are expensive, complicated to operate and not easy to use on a large scale in the field

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