Numerical Simulation And Analysis Of The Mechanical Performance Of The Multi Compartment Rectangular Assembly Utility Tunnel

In order to better promote the process of urbanization,ensure that the municipal infrastructure is in place,and prevent the later repeated repair,China gradually realizes that the utility tunnel has a very important significance for the long-term sustainable development of the city.The development and application of utility tunnel can avoid the repeated excavation of pavement caused by the burying,maintenance and expansion of pipeline lines,reduce the engineering expenditure of Pavement Renovation,save a lot of ground and underground space while beautifying the city appearance,make the underground space use and become more orderly,and extend the service life of pipeline lines.As an important municipal infrastructure,the utility tunnel is listed as a national key construction project.In this paper,the finite element software ABAQUS is used to carry out numerical simulation analysis of the mechanical performance of the multi compartment rectangular utility tunnel structure.Firstly,this paper puts forward a whole prefabrication and assembly scheme of utility tunnel.On the basis of summarizing the structural section shape and cabin layout principle of the utility tunnel,the double-layer four compartment utility tunnel is selected as the research object,and the section shape and size of the utility tunnel are determined according to the existing code requirements,and the load calculation and structural design are carried out.The finite element analysis software ABAQUS is used to The overall structure of the utility tunnel is studied by numerical simulation,and the stress conditions are investigated.According to the results,the mechanical characteristics are summarized,and the mechanical properties and failure characteristics are analyzed.Then the section layout of the utility tunnel is studied.In this paper,the control variable method is used to keep the wall thickness and relevant material parameters of the utility tunnel unchanged.The position of the internal vertical bearing concrete slab,the position of the internal transverse bearing concrete slab and the cross-section size of the utility tunnel are changed respectively.The numerical simulation research on the mechanical performance of the utility tunnel is carried out,and the influence on the mechanical performance of the utility tunnel is analyzed.The conclusion is that when When the internal vertical and horizontal bearing concrete slab position is in the central axis position,the impact on the utility tunnel is the smallest;at the same time,the size of the utility tunnel will reduce the adverse impact of the utility tunnel as much as possible under the conditions of meeting the use specifications.Finally,the structural parameters of the utility tunnel are compared and analyzed.Using the method of control variables,under the premise of keeping the thickness of the pipe wall of the utility tunnel unchanged and other influencing parameters unchanged,the three parameters of the thickness of the internal vertical bearing concrete slab,the thickness of the internal horizontal bearing concrete slab and the concrete strength grade of the utility tunnel are changed respectively,and the mechanical performance of the utility tunnel is simulated and analyzed,and the three parameters are studied for comprehensive analysis It is concluded that in order to be beneficial to the overall structure of the utility tunnel,the thickness of the internal vertical bearing concrete slab should be increased reasonably,the thickness of the internal horizontal bearing concrete slab should be reduced reasonably,and the strength of the concrete should be increased reasonably.