The tunnel is located below the surface about 11meters, tunnel span is 14.5 m, height is 8.2 m, it’s 5.4
m from high-rise buildings, tunnel lining using reinforced concrete, of which the thickness is 500mm, the
size of cross section of the tunnel is shown in figure 4. Tunnel connecting line excavation top boundary
always embedded in weak weathered and silky weathered rock. Filling type structures develop in the
local area that cut the coarse grained granite which serve as rock foundation, the rock mass integrity was
broken. In the process of excavation it is easy to cause the fall, collapse and other phenomena that will
bring great hidden danger to tunnel safety construction .
The tunnel is located below the surface about 11meters, tunnel span is 14.5 m, height is 8.2 m, it’s 5.4m from high-rise buildings, tunnel lining using reinforced concrete, of which the thickness is 500mm, thesize of cross section of the tunnel is shown in figure 4. Tunnel connecting line excavation top boundaryalways embedded in weak weathered and silky weathered rock. Filling type structures develop in thelocal area that cut the coarse grained granite which serve as rock foundation, the rock mass integrity wasbroken. In the process of excavation it is easy to cause the fall, collapse and other phenomena that willbring great hidden danger to tunnel safety construction .
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