Adoption of size effect combined with Winkler elastic foundation beam theory in section shield tunnel under underground space development

Autor: Bai Yang, Liu Yunqiu, Xiao-Fei Wang, Bin-Song Jiang, Yang Le, Li Zonghao
Rok vydání: 2021
Předmět:
Zdroj: Arabian Journal of Geosciences. 14
ISSN: 1866-7538
1866-7511
DOI: 10.1007/s12517-021-06874-1
Popis: It aims to discuss the adoption value of combining the size effect and Winkler elastic foundation beam theory in the large-section shield tunnel under the background of underground space development. Two kinds of soil layers of silty clay and sand pebble are simulated. The difference of settlement, longitudinal deformation, and earth pressure of large-section shield tunnel in the simulated soil layers is analyzed. The longitudinal design model of shield tunnel based on large-section and compound stratum is constructed according to Winkler’s elastic foundation beam theory and the longitudinal equivalent continuous model of shield tunnel. The results show that the tunnel diameter has an exponential relationship with the effective rate of longitudinal stiffness and equivalent longitudinal stiffness. The overall longitudinal settlement curve of the tunnel in the compound stratum presents the “S” shape. The maximum differential settlement of the tunnel is −55 mm. The soil pressure around the tunnel from high to low is arch bottom, left arch waist, right arch waist, and arch top. The maximum settlement of the tunnel in the silty clay and sand pebble is −6.08 mm and −15.85 mm, respectively; the maximum uplift of the arch bottom is 11.65 mm and 17.74 mm, respectively; the earth pressure around the arch top is 2.184 MPa and 4.22 MPa, respectively; and the earth pressure around the arch bottom is 2.236 MPa and 3.88 MPa, respectively. At the boundary of the two strata, the maximum earth pressure around the top of the arch is 4.56 MPa, and the maximum earth pressure around the bottom of the arch is 4.17 MPa. It suggests that the longitudinal design model of shield tunnel with large-section and compound stratum is successfully constructed according to the size effect combined with Winkler elastic foundation beam theory, which provides a reference method for the design of the tunnel structure with large cross-section.
Databáze: OpenAIRE
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