Crystallization Clogging Distribution and Its Prevention in Drainage Pipes of Highway Tunnels in Guangdong Province
The crystallization clogging distribution phenomenon and hazard in drainage system of highway tunnels in Guangdong Province was investigated,and the characteristics of crystal distribution in drainage system,crystallization mechanism and prevention measures of highway tunnel drainage system were then discussed.The results show that the crystallization phenomenon in the drainage system of highway tunnels was common in Guangdong Province,which was mainly distributed in the karst area in the north Guangdong,and this phenomenon also existed in a few non-karst tunnels,which could always lead to tunnel leakage.The crystallization of tunnel drainage system in karst area was mainly related to the carbonate deposition reaction,while that in non-karst area was mainly related to the Ca2+precipitation of lining concrete.The crystallization control measures of drainage system in highway tunnels were put forward,including optimization of the drainage system structure design and the Ca2+precipitation of concrete,ditch precipitation and dredging for the drainage system.The research results provide reference for construction and maintenance of highway tunnel.
NETL
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