Research on External Load Inversion of Underwater Large-Diameter Shield Tunnel Based on Measured Displacement
[Purposes]This paper aims to reflect the structural mechanics state of the whole section of under-water shield tunnel permanently and accurately.[Methods]Based on a large-diameter shield tunnel project across the river in Jiangsu Province,the high-precision measurement and data preprocessing method of shield tunnel segment deformation based on ATS laser tracking is used.Based on the measured deformation data and combined with genetic algorithm and damping least squares optimization method,the external load condition of shield tunnel cross section is inverted,and the results were compared with the monitoring results.[Findings]Engineering applications show that:The external loads inverted by genetic algorithm and damped least square method are between the field measurement and Terzaghi theory.Compared with the two,the mini-mum error of horizontal load is 1%,the maximum error is 13.54%,and the average error is 5.98%.The minimum error of the vertical load at the top is 6.11%,the maximum error is 13.2%,and the average er-ror is 10.47%.[Conclusions]Based on the field measured displacement data,the technical route of in-verting the external load condition of underwater shield tunnel at any section and any time period is fea-sible,which provides a new way for the timely monitoring of the external load condition of the tunnel.
underwater shield tunnelprecise measurementgenetic algorithmdamped least square methodload
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