青藏铁路冻土区路桥过渡段沉降原因分析

发布时间：2018-04-13 20:44

本文选题：青藏铁路 + 多年冻土　；参考：《冰川冻土》2017年01期

【摘要】：青藏铁路开通近10 a以来,各类冻土工程稳定,保证了列车平稳安全的运行。然而,青藏铁路工程也不可避免出现了一些病害问题。现场调查资料表明,冻土区路桥过渡段下沉现象较为严重。通过冻土区路桥过渡段的沉降特点和工程地质条件综合分析,结果表明:地表水或冻结层上水水热侵蚀,引起人为多年冻土上限下降、高含冰量冻土层融化,致使路基发生强烈的融化下沉。建议这类工程病害应采取主动降温措施增强地基土的冻结能力,并加强防排水设施和改善地表水条件,消除水热侵蚀所产生的融化下沉。研究结果为青藏铁路路桥过渡段的稳定性和养护提供了科学依据。
[Abstract]:Since the Qinghai-Tibet Railway was opened for nearly 10 years, all kinds of frozen earth projects have been stable, which ensures the smooth and safe operation of the train.However, the Qinghai-Tibet railway project also inevitably appeared some disease problems.Field investigation data show that the settlement of road and bridge transition section in frozen soil area is more serious.Based on the comprehensive analysis of the settlement characteristics and engineering geological conditions of the road and bridge transition section in the frozen soil region, the results show that the surface water or the water thermal erosion on the frozen layer causes the upper limit of artificial permafrost to decrease and the frozen soil layer with high ice content to melt.Causes the subgrade to occur the intense melt to sink.It is suggested that such engineering diseases should take active cooling measures to enhance the freezing capacity of foundation soil, strengthen the waterproof and drainage facilities and improve the surface water conditions, and eliminate the melting and sinking caused by hydrothermal erosion.The results provide a scientific basis for the stability and maintenance of the transition section of the Qinghai-Tibet Railway.
【作者单位】：青藏铁路公司冻土技术研究室;中国科学院西北生态环境资源研究院冻土工程国家重点实验室;
【基金】：国家自然科学基金重大项目“中国冰冻圈服务功能形成过程及其综合区划研究”中“冻土和积雪的工程服役功能”课题(41690644) 中国科学院STS项目“冻融灾害对青藏高原冻土工程走廊安全性影响评估”(HHS-TSSSTS-1502)资助
【分类号】：U213.157;U442.2

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