Under Complicated Geological Conditions, Pipe Trench Structure Reinforcement And Leakage Control

The utility tunnel is popularly regarded as an intensive and sustainable way of pipeline laying, containing two or more of the pipe or pipeline system. Owning to many virtues, such as effectively avoiding traffic congestion and lowing environmental pollution caused by the traditional style of municipal pipeline laying. The utility tunnel is generally considered as the symbol of urban modernization and popular in the developed countries. Due to construction funds and construction technology, it is accepted in recent years in China. As the economy rapidly development, the utility tunnel project is gradually increasing in China, and the engineering disease such as water leakage has been paid much attention in recent years.Firstly, the advantages of utility tunnel are elaborated, and structural parameters and construction method of utility tunnel are epitomized at home and abroad,and the problems encountered in the construction process of utility tunnel are analyzed in China.Secondly, based on the reinforcement project of treatment to the utility tunnel of Changjiang Road in Yantai, the distribution of soil and the complicated geological structure are analyzed, and the main mechanical properties of soil in the reinforcement area are tested and analyzed by the ways of field sampling and chamber experiment.Thirdly, the major engineering diseases of utility tunnel are summarized, and the corresponding measures are proposed after analysis. With emphasis on the harmful effect of water, the anti-floating problem and the causes of concrete cracks for utility tunnel, etc., based on practical engineering, some concrete measures to the treatment of engineering disease are put forward, especially the research on the application of reinforced soil permeability by grouting, analyzing the difference of physical properties of soil before and after grouting.Lastly, some bottom slab of the utility tunnel was reinforced, but the effect of the first reinforcement is not ideal. In order to achieve the purpose of reinforcement, using ansys infinite element analysis software, the numerical simulation analysis is applied to validate the feasibility of the second reinforcement.