Tunnel stability and arching effects during tunneling in soft clayey soil |
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Authors: | CJ Lee BR Wu HT Chen KH Chiang |
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Affiliation: | aDepartment of Civil Engineering, National Central University, No. 300, Jung-da Rd., Chungli, Taoyuan 32054, Taiwan;bNational Science and Technology Center for Disaster Reduction, 3F., No. 106, Sec. 2, HoPing E. Rd., Taipei 106, Taiwan |
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Abstract: | A series of centrifuge model tests and numerical simulations of these tests were carried out to investigate the surface settlement troughs, excess pore water pressure generation, tunnel stability and arching effects that develop during tunneling in soft clayey soil. The two methods were found to provide consistent results of the surface settlement troughs, excess pore water generation, and the overload factors at collapse for both single and parallel tunneling. The arching ratio describes the evolution of the arching effects on the soil mass surrounding tunnels and can be derived from the numerical analysis. The boundaries of the arching zones for both single tunneling and parallel tunneling were determined. In addition, the boundaries of the positive and negative arching zones were also proposed. |
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Keywords: | Arching effect Tunnel stability Centrifuge modeling Numerical modeling |
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