无砟轨道铁路路基冻胀问题探讨

Discussion on problem of frost heave of railway subgrade under ballastless track

由于无砟轨道对路基变形和差异变形要求严格,在冻土地区建设无砟轨道高速铁路,需要对路基的冻胀问题加深研究。既要研究适用于无砟轨道路基的不冻胀土填筑材料的标准,又要研究冻胀的预防或治理。无砟轨道路基防冻胀应采取地表水防渗、疏排地下水和严格控制填料及其压实后的细颗粒含量等工程措施,确保冻结深度内路基土的含水量在其不冻胀的范围内。需要研究切实有效的路基防渗结构,并采取疏排地下水的工程措施。尤其是路堑地段,除了基床表面防渗外,还需要采取侧向防渗结构,并与盲沟结合。

T he construction of HSR ballastless track in frozen-soil area requires an in-depth study beforehand,as the structure has very little tolerance for subgrade deformation and different deformation. T he countermeasures concluded are to act in line with relevant standards on the filling material applied,and at the same time target both the precaution and the treatment approaches. T he paper suggests seepage prevention of the ground,underwater discharge and content control on the fine particulars left behind to ensure that the moisture rate does not exceed the requirement level. In this sense,concrete seepage plan for the subgrade and discharge scheme for underground water are to be proposed. It needs to be highlighted that in case of embankment,anti-seepage measures is necessary for the surface layer,as w ell as the side layer and the blind ditch.