Improvement and Application Practice of Drainage System inside Highway Tunnel of Guizhou Province
In response to poor drainage and frequent leakage of water caused by the unreasonable drainage system in the early construction of highway tunnels in Guizhou,a retrospective analysis method was adopted to explore and summarize the characteristics of the drainage system in Guizhou highway tunnels at different periods.The results showed that:1)The early"circular center drainage ditch and Ω-shaped roadside ditch"drainage system had a small cross-section of the central water ditch,and prefabricated installation construction was prone to defects such as joint misalignment and longitudinal slope undulation,Ω-shaped roadside ditches were prone to rolling damage.2)The first improved"rectangular central drainage ditch and U-shaped roadside ditch"drainage system had increased the cross-section of the central drainage ditch.The cast-in-place construction could ensure that the cross-section and slope of the central drainage ditch were straight,which improved the drainage capacity of the central drainage ditch.The U-shaped roadside ditch could avoid being crushed and damaged by the wheels.But the drainage system still had shortcomings such as long horizontal drainage paths,easy blockage,lack of inspection and maintenance,and treatment of water leakage diseases.3)The second improved"three ditch drainage and trapezoidal roadside ditch"drainage system had shortened the horizontal drainage path and reduced the risk of blockage of the horizontal water guide pipe.The added roadside drainage ditches could effectively collect groundwater of surrounding rock,which facilitated the treatment of tunnel leakage water diseases.This drainage system was more suitable for construction conditions such as complex terrain and geology,abundant rainfall,and easy crystallization of groundwater in Guizhou.4)Based on the improvement and practice of tunnel drainage system,the proposed maintainability drainage system design concept has increased the maintainability of drainage pipes and central drainage ditch,which can provide guidance and reference for the subsequent construction of highway tunnels.
highway tunneldrainage systemimprovement and applicationmaintainability
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