The Far Eastern region occupies the entire eastern part of Russia. Permafrost and seasonally frozen grounds are widespread on the territory of the Far East. Currently, there is an increased attention to the development of the Far East, and besides the growth of the railway transport infrastructure is of particular importance. The issues of development and implementation of efficient technologies on modern railways are the most actual for today.
Bridge piers should be classified according to their bearing capacity, depending on the bearing value of the sub-foundation. The pile-trestle type bridge piers are promising for geocryological conditions in the north-eastern regions of our country. The forecasting of the temperature regime of frozen ground is one of the primary tasks in foundation calculation on permafrost.
The article describes a technique for determining the bearing capacity class for pile-trestle type railway bridge piers using the numerical simulation of the thermal interaction of the foundation with a frozen ground body of the sub-foundation. As a result of a numerical simulation, the dependencies between the normative freezing depth, the calculated average annual ground temperature, the span value and the pier class were established. It is found that the use of numerical simulation allows obtaining higher values of the bearing capacity class of piers in comparison with analytical methods.

railroad bridge, load-bearing capacity class, permafrost, pile bridge support type, numerical modeling