既有东北铁路多年冻土区路基病害整治效果研究

既有东北铁路牙林线、嫩林线多年冻土区路基病害严重,借鉴青藏铁路建设的成功经验,利用热棒、保温板及保温护道等综合防治措施进行了路基病害整治。针对牙林线北段试验工程,利用观测断面实测地温资料对试验段综合防治措施效果进行分析。分析表明:防治措施效果明显,有效控制了路基下伏多年冻土地温,冻土上限明显抬升,对保证铁路正常运营发挥了积极作用。

Measures for roadbed problems of railways in permafrost regions of Northeast China

The roadbed problems of railways are very serious in the permafrost regions of Northeast China.Manifold measures are applied in the experimental project to solve the roadbed problems based on the successful experience of Qinghai-Tibet Railway.There are two sections(274K500 m～275K000 m,275K460～276K000 m) in the experimental project in the north region of Yaling Railway.Some active measures such as insulated materials(XPS,EPS) and two-phase closed thermosyphons are applied in these two sections.The ground temperature data of long-term monitoring of the experimental project indicate that the measures can effectively reduce the ground temperature of the permafrost under the roadbed and the thickness of the active layer.And the analytic results indicate that the measures are helpful to the stability of railways.