سال انتشار: ۱۳۹۰

محل انتشار: اولین کنفرانس بین المللی و سومین کنفرانس ملی سد و نیروگاههای برق آبی

تعداد صفحات: ۱۳

نویسنده(ها):

Ahmad Fahimifar – Departement of Civil and Environmental Engineering
Mohammad Reza Zareifard – Departement of Civil and Environmental Engineering

چکیده:

In this paper an analytical-numerical method for hydraulic and mechanical analyses of tunnels below groundwater table excavated in a strain-softening Hoek–Brown rockmass is proposed. The problem is considered as axisymmetric, i.e. the initial stress state is assumed to be hydrostatic. In this method, the seepage body force and thesecondary permeability of rock mass due to the mechanical- hydraulic coupling are taken into account. As the strain dependent permeability and a nonlinear behaviormodel for the rock mass is used, the derived differential quations should be solvednumerically. Thus, the numerical method (the finite difference method) is utilized for these equations. The influence of seepage and the hydro-mechanical coupling, on the elasto-plastic solutions is also examined