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| Method for defining stress release rate caused by overcutting of cutter head of shield tunnel |
| JIN Zhihao1, LIU Tao2, HUANG Xufeng2, WANG Kezhong1*
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1. School of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310023, Zhejiang, China;
2. The Third Engineering Co., Ltd., China Railway Seventh Group, Xi'an 710043, Shaanxi, China |
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Abstract In order to deal with the problem from the large difference in the stress release rate of shield tunnels in different strata and the difficulty to accurately define the stress release rate in numerical calculations, it was studied about the correlation between the loss of the stratum and the stress release rate of the shield tunneling process. A method was proposed, which defined the stress release rate by taking the over-excavation of the cutterhead as the control index, and the application time of the shield shell, grouting, segment supporting and other processes was corresponding to the specific stress release rate. The geometric and physical mechanical parameters of the shield-soil clearance and the overlying stratum in the engineering background were combined, a high-simulation calculation method for the whole process of tunneling with shield tunneling machine was established to realize fine simulation of disturbance deformation. The comparison between the calculation results and the monitoring results proved the correctness of the research method. The simplified calculation method based on the comprehensive control parameters of the stress release rate accurately simulated the stratum deformation of the entire shield construction process in soil texture and improved the calculation accuracy, which could quickly complete the accurate prediction of the shield construction process.
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Published: 07 July 2020
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