高速铁路基床病害研究

Study on the Defect of Foundation Bed of Express Railway

结合我国第一条高速铁路———秦沈客运专线 ,对高速铁路基床的受力状态和作用做了简要的论述。针对基床的受力情况作了土的动力三轴试验 ,得出了随着土饱和度的增大土的动强度会大大降低的结论 ,从而论证了基床表层防渗功能的重要性。分析了基床病害发生的机理 ,指出水渗入基床、造成土的动强度降低是高速铁路产生基床病害的根本原因。结合国外高速铁路的经验 。

Mechanical state and function of foundation bed of the first-built express railway in China, the Qin-Shen special passenger line, are presented. Dynamical triaxial tests were done in allusion to foundation bed with different saturation to observe its impact. The results show that the dynamical strength reduces obviously as the saturation increases indicating the importance of leakage prevention. The mechanism of foundation damage is analyzed. It is found that the ultimate cause of foundation damage is the seepage of foundation inducing the reduction of the dynamical strength. Referring the experience of other countries, consolidating the surface of the foundation bed is the ultimate measure to solve this damage.