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- Title
基于遗传算法的水下全断面砂岩盾构隧道荷载反演分析.
- Authors
封 坤; 李茂然; 曹翔鹏; 彭祖昭; 徐 凯
- Abstract
In the design of shield tunnel structures, it is critical to be able to obtain accurately the loads acting on the segment lining. However, the implementation of field measurements is more difficult and will be affected by environmental and construction factors, while, the load inversion is a better way to get the soil and water loads acting on the lining. This paper proposes a modified beam-spring model applicable to the hard rock load pattern based on the Foshan-Dongguan Intercity Railway Shiziyang Tunnel Project. Combined with the modified model, load inversion is carried out for the tunnel section of medium-weathered argillaceous sandstone. The load values calculated by genetic algorithm, field measurements and Terzaghi Theory are compared, as well as the internal force values calculated from these loads. The lateral pressure coefficient of medium-weathered muddy sandstone obtained by inversion is 0. 38, and the substrate coefficient is 242. 43 MPa/m. The results show that:(1) the use of the modified model is more appropriate under this section, and the loads obtained by the genetic algorithm can better fit the measured internal force values. (2) The load acting on the lining is mainly water pressure, and the load calculation should use water and soil sub-calculation. (3) The parameters of medium-weathered muddy sandstone in the geological survey report are small, and the actual values can refer to the inverse values of the genetic algorithm. (4) The bending moment value obtained from the load calculation using Terzaghi Theory is large and the axial force value is small, and the results tend to be conservative.
- Subjects
TUNNELS; GENETIC algorithms; BENDING moment; WATER pressure; SOIL moisture
- Publication
Railway Standard Design, 2023, Vol 67, Issue 4, p107
- ISSN
1004-2954
- Publication type
Article
- DOI
10.13238/j.issn.1004-2954.202202110005