Numberical Simulation And Optimization Analysis Of The Utility Tunnel Structure

Utility tunnel refers to a tunnel space built underground in the city,where various utilities pipelines,overhaul and monitoring system are set up together.It is the important infrastructure which is constructed underground and ensures the city operation.The utility tunnel were built earlier in the developed areas in the world.It is highly praised by the world due to a number of advantages.China has been proactively developing the utility tunnel.Currently,the study and research of the utility tunnel mainly focuses on the construction technology,while the analysis on the tunnel structure is rare.In this paper,according to the material characteristics and working state of the integrated pipe gallery,the simulation results are obtained by using the finite element software ABAQUS,and the force is analyzed for a practical project.The simplified and soil-junction pipe-gallery model are numerically simulated according to the four factors of concrete strength,steel bar spacing,pipe-gallery size and wall thickness.Each model is 18.The stress and strain cloud diagram obtained by simplified model simulation is studied and analyzed.The model maximum stress and strain contrast table is given,and the influencing factors are analyzed and judged.The stress and strain simulation results of pipe gallery under soil-junction action are analyzed and the stress characteristics of pipe gallery are summarized: the stress diagram of each model floor joint is drawn,the stress characteristics of bottom plate is analyzed;the stress and strain data of pipe gallery bottom plate joint are obtained,and the stress and strain data of pipe gallery bottom plate joint are obtained.The evaluation parameters are introduced to judge the influence degree of the influencing factors,the optimal parameters of the pipe gallery are obtained and the influence law is found out.Centered on the above factors,numerical simulation of the tunnel model under the soil-junction has been conducted,altogether 18 models.It analyzes the counter stresses,strain diagrams,stress graphics of various key points at the tunnel bottom with coMParison,as well as the influence rule,so as to decide the influence degrees of various factors.Then the optimal parameter when the tunnel is under optimum influence will be worked out by providing the coMParison table of the stress of the tunnel bottom of 18 models and the strain.There are 6 models which carries out the numerical simulation of the tunnel model under the stiffness state of the ground reinforcement.First of all,it will simulate and analyses the sedimentation under the stiffness state of the original ground.Second of all,it simulates the stiffness of the ground reinforcement.After analyzing the stress and coMParing the strain diagrams,stress graphics of various key points at the tunnel bottom,it can conclude the influence rule on the stress state of the tunnels of the stiffness of ground reinforcement.Finally,the study on the improving the safety of utility tunnel and guarantee its working life will be developed.Through the above study,it is found that the pipe gallery has the characteristics that the stress of the bottom plate is greater than the roof,the position of the intersection of the plate and the wall is greater than stress of the upper and lower plates between the wall and the wall;the influence of the wall thickness on the stress of the pipe gallery is the greatest.The influence of pipe-gallery size is greater than concrete strength grade,and the steel bar spacing has little effect on the stress of pipe gallery.The stiffness of the foundation has an effect on the stress performance of the main body of the pipe gallery.The increase of the stiffness of the foundation is inversely proportional to the stress of the pipe-gallery.