| In recent years,with the rapid development of China’s transportation industry,the requirements for the capacity of existing roads are getting higher and higher,and some roads built in the early stage have been unable to meet the increasing demand for today’s traffic,in order to alleviate traffic congestion and improve economic development,China will face more and more road reconstruction and expansion projects.Therefore,the management of differential settlement at the junction of new and old roads has become an important problem to be solved urgently in road reconstruction and expansion projects.In the existing new and old road splicing projects,in order to control the differential settlement of the new and old roadbed,polymer materials and other reinforcement materials have been widely used to connect the new and old pavement,but the number and location of polymer materials are mostly empirical,lack of corresponding theoretical analysis and technical guidance,there is economic waste and poor treatment effect.In this paper,the settlement control problem of new and old roads reinforced geogrids is studied.Firstly,several common types of geogrids and their application in engineering are expounded,and the research status of reinforced soil.In this paper,the existing geogrid reinforced roads indoor model test is used as the numerical simulation and research object of the reinforcement-soil interface.Through numerical simulation analysis,the feasibility of the tendon-soil interaction used in this paper is verified.By analyzing the theory and calculation methods of heat conduction of asphalt pavement,this paper briefly introduces the theory of solar radiation,the theory of air temperature and convective heat exchange,the theory of effective radiation of pavement,and the creep model in ABAQUS.Taking the splicing section of a road reconstruction and expansion in Jinzhou District,Dalian City as the research object,the finite element software ABAQUS was used to establish the temperature field calculation model of the spliced road and solve the temperature field analysis result file,on this basis,the reinforced road model was established again and combined with the temperature field analysis result file to carry out the numerical simulation analysis of the reinforced road with continuous temperature change,and the reinforcement effect of the geogrid in the splicing of the new and old roads was studied by controlling the axle load action position,the number and position of geogrid laying layers,the geogrid modulus and the axle load size.The force and deformation characteristics and the effect of laying geogrids to control differential settlement provide design suggestions for road reconstruction and expansion projects.(1)Through ABAQUS finite element software,according to the indoor model test of reinforced subgrade,a finite element model of reinforced subgrade is established to verify the rationality of reinforce-soil interaction.(2)The finite element numerical analysis model of unreinforced spliced road under variable temperature conditions was established,and the influence range and characteristics of the action position of the standard axle load on the force deformation of the road surface were analyzed,and it was found that the maximum settlement occurred at the road surface joint.On this basis,the control effect of reinforcement position and number of reinforcement layers on the uneven settlement of the road by geogrid reinforcement was analyzed,and it was found that the treatment effect was best after laying a layer of geogrid on each layer of steps.(3)On this basis,the control effect of reinforcement position and number of reinforcement layers on the uneven settlement of the road by geogrid reinforcement was analyzed,and it was found that the treatment effect was best after laying a layer of geogrid on each layer of steps.(4)Furthermore,the effects of grid modulus and axle load size on the stress and deformation characteristics of the reinforced subgrade were studied. |
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