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.