Influence of water immersion on dynamic characteristics of heavy-haul railway reinforced subgrade
The dynamic load effect of different axle heavy train was simulated by indoor model experiment in order to solve the problem that the roadbed performance of heavy haul railway decreased after wetting,which affected the safety of train running. The dynamic characteristics and long-term stability of reinforced roadbed of heavy haul railway before and after soaking were analyzed. Results show that the stress,settlement and acceleration of the plain soil roadbed increase significantly after soaking. The maximum stress and the settlement of sleeper decrease by 21％ and 20％ respectively,the maximum stress of composite reinforced roadbed decreases by 23％,and the settlement of sleeper decreases by 30％. The reinforcement can improve the strength of subgrade,make the superstructure of subgrade more stable and reduce the acceleration of subgrade. The stress attenuation coefficient of each layer of roadbed increases after soaking,and the reinforcement makes the stress attenuation coefficient and the stress vertical diffusion depth decrease. The reinforcement can reduce the peak value of pore water pressure and increase the dissipation rate of pore water pressure. Geotextile can keep the properties of ballast layer and reduce the fouling of ballast layer after soaking.
water immersionheavy-loaded railwayreinforced subgradestressaccelerationsettlementpore water pressure
万方数据
