SHALLOW TUNNEL FORMED IN PERMAFROST GROUND Russian patent published in 2006 - IPC E02D29/45 

FIELD: building, particularly to erect building structures in permafrost areas and thick snow cover.

SUBSTANCE: tunnel comprises trench in which load-bearing enclosing structure partly submersed in ground below natural ground surface is arranged. The enclosing structure defines space for transport passage structure location. Nonfrost-susceptible ground layer is arranged under the passage structure. Total height of the nonfrost-susceptible ground layer between passage structure bottom and lower trench surface is to be not less than season thawing depth. Ground prism is created above natural ground surface having axis coinciding with tunnel axis. Width B of ground prism determined along trench top, ground prism width B_p, ground prism height h_e at edges thereof and ground prism height h_a along structure axis are determined from given correlations.

EFFECT: reduced costs of motor road and rail road erection in permafrost ground and increased ability of ground retaining in permafrost condition.

2 cl, 2 dwg