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《Journal of Chang'an University(Natural Science Edition)》 2016-02
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Long-term stability of bearing capacity of single pile in permafrost area on Qinghai-Tibetan Plateau

JIANG Dai-jun;GUO Chun-xiang;School of Civil Engineering,Lanzhou Jiaotong University;  
In order to solve the possible problems of decline bearing capacity and thawing of frozen soil resulting from future global warming in the design of pile foundation in Qinghai-Tibet Railway,thermal analysis model of ground temperature field for a single pile in permafrost was established based on the theory of heat conduction.Considering the condition that pile exposed in air absorbed solar radiation and transferred heat with natural air through convection,phasechange and global warming,ground temperature and long-term bearing capacity changes of a single pile in representative humid permafrost area in future 30 years were calculated and analyzed by using finite element method.The results show that in the coming 30 years,the natural geotherm and the temperature of the pile-soil system 3to 20 m under the surface of the earth become higher as time goes by;the bearing capacity of single pile has the decline tendency infuture.In 2040 summer,the bearing capacity will drop by 41.5%compared with the same period in 2010;in winter the bearing capacity will drop by 28.6% compared with the same period in2010.The"dynamic factors"should be taken into account in basic pile design work in cold region in future.For the existing piles,reasonable and effective measures should be taken to improve the piles bearing capacity,which is key in solving the problems.
【Fund】: 国家自然科学基金项目(51268033);国家自然科学基金重点项目(51236003);; 长江学者和创新团队发展计划项目(IRT1139);; 兰州交通大学校青年基金项目(2013030)
【CateGory Index】: U213.1
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