Method for indirectly evaluating safety condition of existing pipeline under shield tunneling

Abstract

The invention provides a method for indirectly evaluating safety condition of an existing pipeline under shield tunneling and belongs to the technical field of shield construction environment influences. Correlation between pipeline settlement and ground surface settlement is built, so that it is achieved that the safety condition of a pipeline can be adjudged by monitoring the ground surface settlement. According to method, firstly, shield construction parameters, pipeline parameters and soil body parameters are combined, a correlation equation between ground surface settlement and pipeline settlement is built through a three-dimensional finite element model; meanwhile, ground surface settlement monitoring points are arranged, and a ground surface settlement curve in shield tunneling is acquired; then a pipeline settlement curve is deduced; then according to the curvature of the pipeline settlement curve, the pipeline inner force is reversely deduced; and finally, the pipeline inner force is compared with allowed inner force, the safety state is judged. According to the method, it is not needed to directly monitor the pipeline, the correlation between ground surface settlement andpipeline settlement is built, so that it is achieved that the safety condition of the pipeline can be adjudged by monitoring ground surface settlement data, and the monitoring workload and the monitoring difficulty in engineering are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of environmental impact of shield tunneling, in particular to a method for indirect evaluation of the safety behavior of existing pipelines under shield tunneling. Background technique [0002] The existing underground pipeline deformation monitoring mainly consists of the following methods: [0003] First, for larger pipe diameters, it is possible to manually enter the pipeline to install sensors for monitoring. This method is relatively labor-intensive. For some pressure pipelines such as water supply, sewerage, and gas, manual installation of sensors is extremely risky; [0004] Second, for pipes with small diameters, insert a long probe from the ground to the location of the pipe, and measure the settlement of the surrounding soil to approximate the settlement of the pipe. Although this method is also an indirect method, the measured data is not the deformation of the pipe. Data, the error is relatively...

AI Technical Summary

Problems solved by technology

[0003] First, for larger pipe diameters, it is possible to manually enter the pipeline to install sensors for monitoring. This method is relatively labor-intensive. For some pressure pipelines such as water supply, sewerage, and gas, manual installation of sensors is extremely risky;

[0004] Second, for pipes with small diameters, insert a long probe from the ground to the location of the pipe, and measure the settlement of the surrounding soil to approximate the settlement of the pipe. Although this method is also an indirect method, the measured data is not the deformation of the pipe. data, the error is relatively large, and the measurement is time-consuming and laborious

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