| The groundwater problem in tunnel engineering is issue which affects stability of tunnel and slope. Tunnel excavation,the groundwater level will change, affecting the stress field change, and changes in stress field changes will affect the flow field, often leads to changes in the structure of the force, thereby causing distortion, so the calculation needs consider the impact of groundwater level. In the fractured rock in the tunnel exists between seepage and stress fields will influence each other, known as coupling. This statement and a sloping soil slope tunnel started in the following aspects of work:â‘ Finite element analysis described underground engineering and the basic principle of coupled seepage and stress, the use of MIDAS/GTS software indirect flow - stress coupling simulation and analysis of seepage on the surrounding rock displacement, stress, bolt axial force and shotcrete tunnel plastic stress Zone. The results showed that: in the flow - stress coupling, the surrounding rock, bolt, spray for mixed stress had increased, the stress range corresponding increase disturbance is not conducive to the stability of caverns.â‘¡Thickness of the grouting of the lining of the construction of water gushing and structure. Grouting through the finite element simulation found that the thickness effect on the discharge of small, slip ring great influence on permeability coefficient, permeability coefficient control grouting circle m/s can effectively meet the following construction and operation of the tunnel. At the same time, improve the well grouting surrounding rock and the structure of the force.â‘¢Seepage slope stability on the accumulation of body formation, infiltration of rain water to soil saturation increases, causing suction reduced the shear strength of soil decreases, so when the duration and intensity of ongoing rainfall over a certain time limit , infiltration of rain water to reach a certain depth, together with the construction factors, can lead to slope failure.
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