Study on Stability of Multi-arch Tunnel with Different Tunnel Excavation Methods
This paper uses FLAC 3D to simulate the construction process of different excavation methods,and studies the influence of different excavation methods on the stability of surrounding rock.The research shows that:① Cracks are easy to appear on both sides of the arch crown and inverted arch of the tunnel,and the support should be strengthened;② The tunnel excavation method has a great impact on the stability of surrounding rock,so the appropriate tunnel excavation method should be selected according to the engineering geological conditions,construction conditions and other factors;③Compared with the full face excavation method,the three pilot tunnel excavation method can better control the deformation and deformation rate of surrounding rock and effectively limit the development of plastic zone of surrounding rock.
tunnelsurrounding rock stabilitytunnel excavationnumerical simulationthree pilot tunnel excavation method
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