Abstract
Tunnel excavation will lead to the immediate surrounding rock unloading caused by the surrounding rock stress release, the stability of the surrounding rock have a certain impact. In this paper, finite element software ANSYS and finite difference software FLAC3D are used to simulate the excavation and lining process of circular tunnel. The influence of excavation on the rock stability around circular tunnel is analyzed, and the effect of applying lining on the stability of surrounding rock is analyzed. Evaluation criteria selection hole displacement, stress and plastic area of three factors.
Highlights
In the case of larger buried depth and lower strength of surrounding rock, some tunneling measures should be applied to ensure the stability of the surrounding rock
Lining construction on the one hand can enhance the stability of the tunnel and the surrounding rock mass, on the other hand can prevent contact with the rock mass outside the tunnel to form a barrier to isolate water and air, to prevent water or air erosion, weathering ; The formation of a smooth wet weeks, so that the roughness decreases, improve the surrounding water flow, so that cross-sectional flow unit increases, reducing the unit cost of the tunnel; formation of aqueduct to reduce tunnel and surrounding rock mutual seepage; bearing Wai Rock external load, internal load and so on
The total length of the spillway tunnel is 536.66 meters, which is a circular tunnel with a diameter of 10 meters
Summary
In the case of larger buried depth and lower strength of surrounding rock, some tunneling measures should be applied to ensure the stability of the surrounding rock. Lining construction on the one hand can enhance the stability of the tunnel and the surrounding rock mass, on the other hand can prevent contact with the rock mass outside the tunnel to form a barrier to isolate water and air, to prevent water or air erosion, weathering ; The formation of a smooth wet weeks, so that the roughness decreases, improve the surrounding water flow, so that cross-sectional flow unit increases, reducing the unit cost of the tunnel; formation of aqueduct to reduce tunnel and surrounding rock mutual seepage; bearing Wai Rock external load, internal load and so on. It is one of the hot spots in underground engineering to study the influence of tunnel lining on the stability of surrounding rock through numerical simulation
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