Safety of lining structure and stability its surrounding rocks for the diversion tunnel of Danba Hydropower Station
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Abstract:
The influences of bolt and lining on the stability of its surrounding rock are investigated in this study for the diversion tunnel of Danba Hydropower Station.The thickness of tunnel lining under different buried depths are investigated,and the safety of lining under different working conditions is analyzed.The reinforcement and the crack width are checked,and the influences of different lining application time on the force and displacement of the tunnel are taken into consideration.It is found that the bolt supporter can make the distribution of the plastic zone of its surrounding rocks more uniform and the force is more reasonable,which could control the deformation of the surrounding rock better.The maximum compressive stress in the lining will increases with depth,and decreases with the lining thickness.An effective decompression zone is proposed,which should be selected within the effective decompression zone.The lining thickness is preferred at 1.5 m.In the most dangerous conditions,a reasonable design scheme of reinforcement is given.By comparing and analyzing the safety of lining under different displacement and different models,85% displacement reserve is chosen for lining reinforcement,and the deformation and maximum internal force of surrounding rock can be obviously controlled.
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