Elasto-plastic analysis of the surrounding rock mass in circular tunnel based on the generalized nonlinear unified strength theory

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• 作者：Xiujie Huang^a ; ^{huangxiujiehh@163.com" class="auth_mail" title="E-mail the corresponding author} ; Jixun Zhang^a ; Ling Yang^a ; Shikou Yang^a ; Xingli Wang^b
• 关键词：Circular tunnel ; Generalized Hoek&ndash ; Brown strength criterion ; Generalized nonlinear unified strength criterion ; Intermediate principal stress ; Elasto-plastic stress and displacement
• 刊名：International Journal of Mining Science and Technology
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：26
• 期：5
• 页码：819-823
• 全文大小：651 K

文摘

The present paper aims to establish a versatile strength theory suitable for elasto-plastic analysis of underground tunnel surrounding rock. In order to analyze the effects of intermediate principal stress and the rock properties on its deformation and failure of rock mass, the generalized nonlinear unified strength theory and elasto-plastic mechanics are used to deduce analytic solution of the radius and stress of tunnel plastic zone and the periphery displacement of tunnel under uniform ground stress field. The results show that: intermediate principal stress coefficient b has significant effect on the plastic range, the magnitude of stress and surrounding rock pressure. Then, the results are compared with the unified strength criterion solution and Mohr–Coulomb criterion solution, and concluded that the generalized nonlinear unified strength criterion is more applicable to elasto-plastic analysis of underground tunnel surrounding rock.