Monitoring and early warning method for full life of tunnel structure at variable cross section

Abstract

The invention relates to a monitoring and early warning method for the full life of a tunnel structure at the variable cross section, and belongs to the field of tunnel monitoring. A system comprisesa sensor, a monitoring center platform, a data storage and an alarm; the sensor is connected with the monitoring center platform; and the monitoring center platform is connected with the data storageand the alarm separately. The method comprises the steps that limit values of monitoring indexes are acquired by adopting a numerical limit analysis method; a numerical simulation result of a variable-cross-section cross-over tunnel fracture surface is analyzed; the positions and arrangement of monitoring points on the variable-cross-section fracture surface are obtained by comparing numerical values of the obtained result; and the tunnel structure stability evaluation criterion is protocoled according to the variable-cross-section cross-over tunnel structure stress distribution law, and variable-cross-section cross-over tunnel structure monitoring control indexes are built, wherein the indexes comprise the stratum deformation monitoring index and the variable-cross-section cross-over tunnel structure deformation and stress monitoring index.

Description

technical field [0001] The invention belongs to the field of tunnel monitoring and relates to a method for monitoring and early warning of the whole life of a tunnel structure at a variable cross-section. Background technique [0002] Variable cross-section crossing tunnels mainly adopt the planar crossing method of Y bifurcation, or the orthogonal and oblique spatially close three-dimensional crossing method. The excavation and supporting lining of variable cross-section intersection tunnels are subject to complex structural forces and large mutual influences. There are special requirements in the determination of excavation methods, reinforcement of rock and soil at intersections, and construction monitoring and measurement. Therefore, how to control the large deformation and damage of the surrounding rock of the variable cross-section crossing tunnel and ensure the safety of the tunnel construction and operation stages is very necessary for the construction of the tunnel....

AI Technical Summary

Problems solved by technology

The construction stage and operation stage of variable cross-section cross tunnels are often monitored manually. It is difficult to predict the surface settlement and development process caused by the tunnel entrance in time, resulting in the impending structural damage not being reinforced in time. Traditional monitoring and early warning often Single, unable to monitor and warn the whole life cycle of the tunnel structure systematically

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