Construction Technology for Waterproofing and Drainage of Long Shallow Water Diversion Tunnels in Water Rich Areas
Due to the presence of a large amount of groundwater and high water pressure around the main structure of the long and shallow buried water diversion tunnels in water rich areas,leakage problems often occur during the construction process.These leakages not only affect the water diversion effect of the tunnels,but also directly affect the stability of the rock mass structure around the tunnels,and further threaten the construction safety.Combining an example of a water diversion tunnel project in Xinjiang,this article proposes different waterproofing and drainage schemes for different leakage scales.When seepage occurs,wedge-shaped groove drainage pipes,embedded conduit pipes and waterproofing membranes are used for the treatment;when water surges occur,measures such as interval segmented grouting and advanced ring pre-reinforcement are taken to deal with the problems.After the treatment with above schemes and engineering inspection,there are no water seepage or inflow problems found in the tunnel.
diversion tunnellong and shallow buried tunnelswater rich areaswaterproofing and drainage
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