A Method of Indirectly Evaluating the Safety Behavior of Existing Pipelines Under Shield Tunneling

Abstract

The invention provides a method for indirect evaluation of the safety behavior of existing pipelines under shield excavation, which belongs to the technical field of shield tunnel construction environmental impact. By establishing the relationship between pipeline settlement and surface settlement, the pipeline can be determined by monitoring the surface settlement safe behavior. In this method, the correlation equation between the ground surface settlement and the pipeline settlement is firstly established by combining the shield construction parameters, pipeline parameters and soil parameters through the three-dimensional finite element model, and at the same time, the surface settlement monitoring points are arranged to obtain the surface settlement curve during shield tunneling; and then deduced The pipeline settlement curve is obtained; then according to the curvature of the pipeline settlement curve, the internal force of the pipeline is reversed; finally, the internal force of the pipeline is compared with the allowable internal force to determine the safe state. This method does not need to directly monitor the pipeline. By establishing the relationship between the surface settlement and the pipeline settlement, the safety behavior of the pipeline can be determined by monitoring the surface settlement data, which greatly reduces the monitoring workload and difficulty in engineering.

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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