岩土力学Issue(3)：717-722,728,7.
弹塑性软化模型下隧洞围岩变形与支护压力分析
Study of support pressure and surrounding rock deformation of a circular tunnel with an elastoplastic softening model
摘要
Abstract
To provide an insight into the effect of the nonlinear strain-softening phenomenon on the mechanical behavior of the surrounding rock mass, an elastoplastic softening model considering softening coefficient is proposed. The approach for calculating the stress and strain states in the surrounding rock of a circular tunnel is presented. Then, by comparing with Brown’s method and converted Mohr-Coulomb failure criterion method, the proposed model is proved to be reasonable. Finally, effects of softening coefficient on the deformation behavior of surrounding rock and the support pressure are studied. The results show that:when the softening coefficient is relatively large, the result by the elasto-brittle-plastic model is basically identical to that by elastoplastic softening model;it is the radius of the loose region that mainly controls the deformation and stability of surrounding rock;the critical support pressure that controls the appearance of plastic region is equal to the radial stress at the elasticplastic boundary quantitatively.关键词
弹塑性软化模型/Hoek-Brown屈服准则/软化系数/围岩变形Key words
elastoplastic softening model/Hoek-Brown failure criterion/softening coefficient/deformation of surrounding rock masses分类
建筑与水利引用本文复制引用
崔岚,郑俊杰,章荣军,张威..弹塑性软化模型下隧洞围岩变形与支护压力分析[J].岩土力学,2014,(3):717-722,728,7.基金项目
山西省交通厅科技建设项目（No.10-2-13）。 （）
