温度及机车载荷耦合作用下多年冻土区路基稳定性研究
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摘要
受区域气候条件和外界环境条件的影响,青藏铁路多年冻土区典型路基结构热学稳定性(保护多年冻土效果)和工程稳定特点有其特殊性。结合多年冻土地区的气候环境条件,选取青藏铁路格尔木至拉萨段北麗河试验段典型的路基断面,对多年冻土区素土路基和块石路基结构在气候变化时的温度场以及机车荷载产生的动力场的耦合作用下的路基应力-应变场、沉降变形特征等进行了计算分析。最后对控制多年冻土地区路基变形的工程措施进行了评价。
Influenced by the regional climate and external environment conditions,the typical embankments in permafrost regions along the Qinghai-Tibet Railway have specific characteristics in terms of thermal stability and engineering stability.In consideration of the climate and environment conditions in permafrost regions,the embankment sections of the Qinghai-Tibet Railway from Golmud to northern Lhasa are selected as experimental samples.The stress-strain field and deformation of embankments under the action of temperature field coupled with the dynamic field generated by train load in permafrost regions along the Qinghai-Tibet Railway are simulated.Finally,the engineering measures to control the deformation of the embankments in permafrost regions are evaluated.
Influenced by the regional climate and external environment conditions,the typical embankments in permafrost regions along the Qinghai-Tibet Railway have specific characteristics in terms of thermal stability and engineering stability.In consideration of the climate and environment conditions in permafrost regions,the embankment sections of the Qinghai-Tibet Railway from Golmud to northern Lhasa are selected as experimental samples.The stress-strain field and deformation of embankments under the action of temperature field coupled with the dynamic field generated by train load in permafrost regions along the Qinghai-Tibet Railway are simulated.Finally,the engineering measures to control the deformation of the embankments in permafrost regions are evaluated.
引文
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[6]王勖成.有限单元法[M].北京:清华大学出版社,2003:444–448.(WANG Xu-cheng.Finite element method[M].Beijing:Tsinghua University Press,2003:444–448.(inChinese))
[7]孙斌祥,徐学祖,赖远明,等.块石路堤、护坡导热系数的实验研究[J].中国公路学报,2003,16(3):6–10.(SUNBin-xiang,XU Xue-zu,LAI Yuan-ming,et al.Experimentalresearch on thermal conductivity parameter of ballastembankment and revetment[J].China Journal of Highwayand Transport,2003,16(3):6–10.(in Chinese))
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