A Statistical Study on the Design Characteristics of Highway Tunnel Drainage Systems in Different Regional Environments
(1. School of Civil Engineering, Chang'an University, Xi′an 710064; 2. School of Highway, Chang'an University, Xi′an 710064;3.CCCC Road & Bridge International Co., Ltd., Beijing 101100)
Abstract:
Whether the tunnel drainage system is working properly during the operation of a highway tunnel is directly relevant to the safety of the tunnel's support structure. To better understand the design characteristics and applicability of highway tunnel drainage systems in different regional environments in China, this paper collects the design samples of typical highway tunnel drainage systems from fourteen provinces and autonomous regions based on the characteristics of the climatic environment and geographic information in China, and conducts a comparative analysis of the design differences and characteristics of the drainage systems in different regional environments from three perspectives: the general drainage ways, local drainage design, and different structural combinations of the drainage systems. This paper also discusses the design of highway tunnel drainage systems and drainage model construction and optimization in carbonate areas. The results show that China's highway tunnel drainage systems can be categorized into three types: main drainage through the underground side culvert, main drainage through the central drainage trench, and main drainage through the underground side culvert + central drainage trench, with obvious regional characteristics. These different types of drainage systems are different in terms of their advantages, but similar in terms of their disadvantages. The drainage design in non-frozen areas is diversified, and the design of main drainage through underground side culvert is recommended for small drainage amounts, which would have a shorter drainage path and is easy for later maintenance, while the design of main drainage through underground side culvert+ central drainage trench can be used for large drainage amounts. Tunnel drainage systems in frozen areas are all of the main drainage through central drainage trench, of which, the inspection wells of the central drainage trench can be arranged with multiple layers of insulation materials to form a multi-layer internal cavity structure, which can effectively guarantee the temperature level of the water environment in the trench. By lowering the elevation of the transverse blind pipes in the longitudinal blind pipe inspection well, the existing mesh drainage model can be optimized into a series-parallel drainage model, which has a short drainage path and low probability of drainage system blockage, and can be automatically converted into the mesh drainage model when the drainage volume is large, thus ensuring the overall drainage capacity.
LIU Yuyang1 SHENG Anhu1 LAI Hongpeng2 ZHUANG Chaohui3 WANG Hejun3
.A Statistical Study on the Design Characteristics of Highway Tunnel Drainage Systems in Different Regional Environments[J] MODERN TUNNELLING TECHNOLOGY, 2023,V60(2): 28-37