Study and application of comprehensive support technology for collapse in diversion tunnel
Collapse occurred during the excavation of Tuolou-Guangsha tunnel of Tuoying Reservoir Irrigation Zone Project.The results of analysis demonstrate the major causes are the rock fracture zone and insufficient support un-der complex geological conditions.To ensure construction safety,a comprehensive support technical scheme was proposed,including slope protection by debris blocking,surrounding rock deformation monitoring,large and small pipe shelf support,steel arch support,collapse clearance,soft foundation cleaning of the floor,cushion concrete con-struction and backfill groutingetc.By the cyclic footage construction method,the safety and stability during the con-struction process were effectively controlled,ensuring the smooth progress of the project.
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