ENGINEERING CHARACTERISTICS OF PERMAFROST AND FROZEN SOIL ENINEERING IN QINGHAI-TIBET RAILWAY

In more than a half century,the researchers of Northwest Research Institute,on behalf of railway system,carry out the studies on the problems of survey and design of railway engineering centering closely on the frosting and thawing characteristics of soil in permafrost regions,engineering geological survey of per- mafrost and frozen soil subgrade and foundation,design calculation method of the major structures,etc.The obtained achievements are already brought into the relative regulations of railway survey,design and con- struction in permafrost regions of China,and are taken as the criterion for railway maintenance and survey and construction of new railway lines.This paper is the summary of the studies.