The Rheological Mechanism of a Composite Dilatant Water-Osmotic Surrounding Rock Tunnel-Supporting System and its Viscous Elasto-Plastic Effects

【摘要】：正As the design requirement of a high pressure diversion tunnel for a hydropower station,a numerical calculation method which is considered the rheological behaviour and the water-osmotic effect in composite dilatant rock mass is suggested in this paper.Through the experiments of rock mass dilatation a mechanical model for swelling rock coupled with its creep effect is established and a two dimentional finite element analysis is carried out for the viscous elasto-plastic surrounding rock-tunnel supporting system to determine the ground permeating force,dilatant pressure,tunnel peripheral deformation and its stress distribution.It is very helpful to understand the stability loss or the structure failure of such complex rock mass as well as the stress mechanism of its lining support.