Three-dimensional plastic stress analysis of subsea tunnels: Nonlinear vs. linear - a comparison

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• 作者：Liji Long ; Haigui Kang ; Renjie Mo
• 关键词：3 ; Dimensional plastic stress ; subsea tunnels ; seepage body force ; Zhang 3D HB yield criterion ; comparison
• 刊名：KSCE Journal of Civil Engineering
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：21
• 期：1
• 页码：178-183
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Civil Engineering; Industrial Pollution Prevention; Geotechnical Engineering & Applied Earth Sciences;
• 出版者：Korean Society of Civil Engineers
• ISSN：1976-3808
• 卷排序：21

文摘

The out-of-plane stress is very influential in the rock yield behavior; however, its effects on plastic stress field around subsea tunnels have not yet been analytically performed due to a lack of understanding of the relationship between the out-of-plane stress and the major/minor principal stress at failure. In this regard, a non-associated ow rule is utilized. With the established equilibrium equation, the nonlinear and linear solutions to the 3-Dimensional plastic stress field around subsea tunnels excavated in a Zhang 3D HB and Drucker-Prager rock mass are derived, and seepage body force is taken into account. After validation, a comparison of the changes in mechanical responses for various parameters in the two solutions is carried out. The analyses show that a significant difference exists in 3-Dimensional plastic stress as well as the plastic radius, which indicates that the analytical solution presented can be effectively used for the realistic design of subsea tunnels.