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多年冻土问题是青藏铁路建设面临的主要工程地质问题,2001年开始,随着铁路路基、桥梁等构筑物的建设施工,多年冻土环境发生了变化,从而影响到多年冻土的工程稳定性.通过对青藏铁路建设期间历年来寒季暖季的冻害现场调查,在2002年寒季调查中发现多年冻土区的路基出现裂缝;2003年寒季调查发现冰椎、冰幔、混凝土剥蚀、沙害等;2004年又发现边坡渗水、涵洞积冰等冻害;2005年寒季调查发现新生病害较少.通过现场分析和及时治理,逐步提出了多年冻土区的补强措施,制定了主动保护措施为主、被动保护措施为辅的综合性解决方案.在设计方面,增加了对多年冻土的认识,及时将调查情况反馈到设计中去,调整设计思路,转变设计理念,实现青藏铁路的动态设计理念.
Permafrost is the major engineering geological problem facing the construction of Qinghai-Tibet Railway. Since 2001, with the construction of railway subgrade and bridges and other structures, the permafrost environment has changed, thus affecting the stability of permafrost. Through the field investigation of frost damage during the warm season in the cold season over the years during the construction of the Qinghai-Tibet Railway, cracks were found in the subgrade in the permafrost region during the 2002 cold season survey. In the cold season in 2003, it was found that ice, ice mantle, concrete erosion, sand Etc .. In 2004, it was found that the slope infiltration, culvert ice accumulation and other frost damage; the cold season in 2005 found fewer new diseases.Through on-site analysis and timely treatment, and gradually proposed the permafrost region reinforcement measures, developed a proactive Protection measures, supplemented by passive protection measures comprehensive solution.In the design, increased understanding of permafrost, the timely investigation of the situation back to the design to adjust the design ideas, change the design concept, to achieve the Qinghai-Tibet Railway Dynamic design concept.