Coupling Analysis on Seepage and Stress in Jointed Rock Tunnel with the Distinct Element Method

摘要

Based on the postulate of the characteristics of fluid flow through joint networks of rock mass, the numerical simulation on coupled problem of seepage and stress in jointed rock tunnel was theoretically analyzed with the distinct element method. The theory of tunnel excavation and coupling effects between lining structure and groundwater seepage were studied. The numerical results show that the maximuM stress of the wall rock increases but the maximuM displacement decreases after the liner is applied. When considering the effects of seepage, the maximuM stress and displacement of the tunnel wall rock have increased in varying degrees, the axial force and shear force of the liner decrease slightly, and the bending moment is large. The effects on the bending moment of the liner from the deformation are greater than that from the shear force in this condition.