京沪高速铁路石英二长岩全风化物路基原位激振试验研究

采用石英二长岩全风化物填料填筑路基,其结构动态性能需要验证,有必要进行激振试验。利用激振试验系统,对京沪高速铁路石英二长岩全风化物填料路基试验段进行原位激振试验,测定路基各断面的振动响应、结构内力和累积沉降等,分析该路基的振动特性和动力稳定性,以期为高速铁路路基填料的选择提供借鉴。结果表明:石英二长岩全风化物物理改良填料临界动应力在80 k Pa左右,塑性应变主要产生于基床底层中上部,加载150×104次后,基床表面最大弹性变形不足1 mm,满足其变形控制要求。

In-situ Forced Vibration Test on Beijing-Shanghai High-speed Railway Subgrade Filled by Completely-weathered Quartz Monzonite

In-situ forced vibration test of the high-speed railway subgrade filled by completely-weathered quartz monzonite needs to be carried out to confirm the dynamic properties of the structure. The dynamic test system is used to test the vibration response,internal force and settlement of a subgrade section in the Beijing Shanghai high railway which can provide a reference for high-speed railway subgrade filler. Result shows the critical dynamic stress of completely-weathered quartz monzonite physical modified filler is about 80 k Pa,plastic deformation is mainly produced in the upper part of the base bed,and the maximum elastic deformation is less than 1mm on subgrade surface which meet the requirement of deformation control after times of loading.