Study On Geological Environment Characteristics Of Permafrost Regions Along The Sino - Russian Oil Pipeline

This study is based on the engineering example that the China-Russia oil pipeline project(Mohe- Daqing section).The project was built in 2011 it has appeared geological disasters and economic losses were resulted. In this paper, the basic situation of studying engineering area is analysis from the perspective of the geological environments(the four phase system composed of rock and soil, water, ice and air). The basic characteristics of rocks, frozen soil, water and air in the study area are obtained. Finite element analysis and mathematic model are used, soil thaw depth, thawing settlement deformation and caused by refreezing are studied based on the frost heave deformation, the bare tube and heat preservation tube base below the permafrost in the pipeline at the beginning of operation(5a) and the end of the(50a). The changes of geological environments are obtained, and the corresponding engineering measures are taken for the trend of the geological environment change. The studying results could help to reduce and avoid the occurrence of geological disasters, reduce economic losses and provide reference for the future construction and safety operations in the permafrost area.