Upper-bound stability analysis of dual unlined elliptical tunnels in cohesive-frictional soils

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• 作者：Jian Zhang ; Feng Yang ; Junsheng Yang ; ^{jsyang@csu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xiangcou Zheng ; Fanxuan Zeng
• 关键词：Dual elliptical tunnels ; Finite element limit analysis ; Center-to-center distance ; Upper-bound solution ; Collapse mechanism
• 刊名：Computers and Geotechnics
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：80
• 期：Complete
• 页码：283-289
• 全文大小：2010 K

文摘

This study investigates the stability of dual unlined elliptical tunnels in cohesive-frictional soils using upper-bound finite element methods with rigid translatory moving elements (UBFEM-RTME). Results are determined in terms of dimensionless stability numbers, which increase with ϕ and decrease with increasing B/D and C/D, and collapse mechanisms, which mainly include two wedge-shaped zones and a complete non-plastic wedge. The center-to-center distance S significantly affects the stability of dual tunnels, and the interaction between the elliptical tunnels tends to disappear when S_c lies within (i) 2.5D-4D for C/D = 1, and (ii) 4D-11D for C/D = 5. The results agree well with those in literature.