Design and technology concepts in providing auxiliary track roadbed stability on permafrost

Far Eastern State Transport University, 47, Serysheva str., Khabarovsk, 680021, Russia

^* Corresponding author: oksiplus@mail.ru

Abstract

The main reason for the loss of sustaining capacity in structures on permafrost is connected with settlements that take place in thawing soils of the roadbed in its enclosed spaces in the subgrade. The technogenic impact of the linear structures produces a thermal effect on the roadbed soils as the structures play an obstacle on the way of ground waters because the thermal conductivity of the structures’ soils is higher than that of the subgrade natural soils. Besides, the vibro-dynamic impact of traffic also leads to the thermal settlement of the roadbed first, and after 5-7 years it results in the plastic soil extrusion of high plasticity loose ground in a waterbearing subgrade (moss, turf, silt, ect.). Thus, the roadbed becomes stable after 16-19 years.