The Experimental Research On Dynamic Characters Of Utility Tunnels Under Heavy Traffic Load

The utility tunnel is the economic artery of urban operation.It can centralize and manage all types of pipelines for city operations.In recent years,the state has intensively issued relevant policy documents and standards and actively promoted the construction of utility tunnel.People use the limited and precious resources of underground space rationally to improve the overall carrying capacity of the city.With the development of economy and transportation,urban transportation is characterized by new features such as increased traffic,increased load,and accelerated speed.The new characteristics of traffic loading pose serious challenges to the normal use and safe operation of utility tunnel in cities.When a heavy-traffic vehicle passes through the utility tunnel structure,the impact load of the vehicle will inevitably affect the structure below the road surface because of shallow structural cover.Once cracks and collapses occur in the utility tunnel structure,it will have a direct impact on the city's "major artery".It will lead to huge economic losses,even casualties,and crisis social production safety.In order to ensure the safety of the utility tunnel,a century-long plan for maintaining infrastructure construction is maded.The influence and control of utility tunnel under the heavy traffic vehicles has become an important issue for geotechnical and municipal engineering.Therefore,the article has analyzed the dynamic characteristics of utility tunnel under the action of heavy traffic vehicles with the help of physical tests and finite element numerical simulations.It can provide reference value for the design and construction of utility tunnels in the future.The main contents and conclusions are shown as follows:(1)Organized and analized the main research content and achievements of traffic loads and utility tunnels at home and abroad.Proposed the content and research route for the test.According to the economic,feasibility and effectiveness requirements of the tests,the characteristics of different instruments were analyzed.Combined with the purpose and requirements of the test,the monitoring parameters and data acquisition instruments were determined.(2)Based on the utility tunnel project,the test method and procedure were determined.Test data has obtained for researching the dynamic response of utility tunnel to provide support for analysis of structural stress and acceleration dynamics characteristic.(3)Through digital filter processing,the stress change law of stress curve under different working conditions was analyzed.Proved the stress feature under unfavorable conditions of the utility tunnel and suggested structural design improvements.(4)Through the numerical analysis,the vibrational frequency of the structure is obtained to analyze the amplitude changing laws of the the acceleration frequency.(5)Combined stress peaks and acceleration amplitudes under different operating conditions and Obtained the change law of them.It can provide an effective reference for vibration law of utility tunnels.