Numerical Simulation Analysis of Dynamic Construction of Unsymmetrically Loaded Multi-arch Tunnel
In relation to the diseases occurs in the construction of an unsymmetrically loaded multi-arch tunnel,finite element software ABAQUS6.10 was used to carry out numerical simulation of the tunnel excavation.The result shows that,multi-step excavation of unsymmetrically loaded multi-arch tunnel may cause multiple disturbance on the surrounding rock,and then affect the slope stability and,in three stages of excavation on the middle drift,the upper bench of the tunnel on mountain side and the upper bench of the tunnel on valley side,the influence on the stability of the tunnel and slope is greatest,thus proper supporting must be done in time;during the excavation of multi-arch tunnel in slope,the failure of slope is such a progressive process that extrusion and collapse firstly happens in the near-cavern region,then disturbs the relatively far slope;due to the action of unsymmetrical pressure,mid-partition plays an important role in the force system of multi-arch tunnel,and is the key part for control of the construction process.
multi-arch tunnelslopeunsymmetrical pressuredynamic constructionconstruction mechanicsmonitoring and analysis
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