Study On Parameter Optimization And Evaluation Method Of Tamping And Stabilizing Operation Of Ballasted Track

In the geometric deterioration of ballasted track,the proportion of bed deformation is more than 90%.During the operation period,the maintenance work is heavy.Now,the maintenance of ballasted track adopts large maintenance machinery.Among them,tamping car and track dynamic stabilizer are the most commonly used large maintenance machines for track bed starting,compactness and track geometry.At present,after the maintenance operation of large maintenance machinery,the speed limit operation is still needed,which affects the operation efficiency and causes potential safety hazards.In this paper,the influence of tamping and stable operation parameters on operation quality and efficiency is studied,and the evaluation method of ballast maintenance effect under different operation parameters is put forward,which provides reference for the realization of state maintenance and management of ballasted track.The main contents are as follows:(1)This paper briefly summarizes the research contents,methods and achievements of tamping and dynamic stability operation quality at home and abroad,analyzes the shortcomings of existing research,and studies the influence of different operation parameters on the dynamic behavior of ballast and sleeper in the process of tamping and dynamic stability from the perspective of improving the operation quality,as well as the evaluation of the state of ballast bed after operation.(2)Based on the theory of multi-body dynamics,the coupling model between tamping device and railway ballast bed and dynamic stability operation model are simulated to simulate the displacement and track of ballast and sleeper in the process of tamping and stability operation changes.Experiments and data in the literature are used to verify the established model of large machine tamping device and ballast.(3)Through setting different parameter values for the amplitude,vibration frequency,speed and depth of tamping picks in the process of tamping operation,this paper studies the changes of the number,dynamics and energy of ballast particles in different areas of the ballast bed under different tamping operation parameters,analyzes the influence rules of tamping parameters on the quality of tamping operation from various aspects,and finally obtains the optimized selected tamping operation parameters.(4)The dynamic stability operation is carried out on the track after tamping.The vertical downforce,horizontal excitation force and horizontal vibration frequency are given different values in the operation process.Based on the criteria of sleeper vertical displacement,ballast compactness,sleeper lateral resistance and ballast support stiffness,the influence law of operation parameters on dynamic stability quality is studied and the optimal dynamic stability operation parameters are obtained.(5)Based on the conclusion of simulation analysis in this paper,combined with the situation of tamping and stable field operation,a quantitative evaluation method for tamping and dynamic stability operation parameters is proposed.Through the multi angle analysis of sleeper,ballast and ballast bed,an evaluation system for tamping and dynamic stability operation parameters is established.In this paper,through the discrete element model of tamping device,sleeper and ballast particle contact in the tamping and stabilization operation of large machine,the optimal operation parameters of tamping and stabilization are obtained,and the quantitative evaluation system for the operation parameters is obtained.The research results can provide certain basis and suggestions for the maintenance operation of on-site ballast bed.