Abstract:

To guide the management unit in maintaining the lining drainage system of highway tunnels and ensure the safety of tunnel structure and traffic, an evaluation method of the technical conditions of the lining drainage system of highway tunnels is proposed. According to structural characteristics, the drainage system is divided into a drainage section, drainage unit, and drainage pipe section, and the corresponding evaluation index system is established by considering the functional and structural defect parameters of each pipe section as evaluation indices. Based on the defect parameters of a municipal drainage pipeline, the calculation method of pipe section defect parameters is determined. The SWMMH software is employed to establish a drainage system model to simulate the state of groundwater in the drainage system and to calculate the flow between each pipe section and drainage unit under different working conditions, the ratio of which represents the weight of different pipe sections and drainage units. The evaluation model of functional and structural technical conditions is established using the idea of hierarchical weighted comprehensive evaluation. The application of the model in an actual project proves that it can reflect an actual drainage system situation.

Key words: highway tunnel, lining drainage system, technical conditions, evaluation method, defect parameters