Abstract: The mechanical parameters of rock and soil are the base of the design,construction,theoretical calculation of geotechnical engineering and other mechanical properties researches.It also has great significance for the study of the mechanism of geotechnical engineering.The mechanical parameters of the roadbed filling with permafrost are studied by experiments.It is concluded that the roadbed fill is the discrete,inhomogeneous and mesolow compressible soil.The relations between elastic modulus,shear strength and confining pressure,ground temperature are obtained through cryogenic tri-axial compression test,which provides the bases for other performance studies of the roadbed in cold regions and renders the references for relative performance studies of the similar engineering.

Key words: permafrost, elastic modulus, shear strength, roadbed

摘要： 岩土力学参数是岩土工程设计、施工、理论计算以及其他力学性质研究的基础,对岩土工程力学机理(如温控机理)的研究具有重要的意义。现对青藏铁路多年冻土区路基填土的力学参数进行了试验研究,得到了路基填土的一种不均匀的非连续中低压缩性土。同时,经过低温常规三轴压缩试验,获得了该填土的弹性模量、抗剪强度等指标在低温下与围压、地温之间的关系。这在一定程度上为路基在寒冷地区其他性能的研究奠定了基础,同时也为类似工程的相关性能研究提供了参考。

关键词: 多年冻土, 弹性模量, 抗剪强度, 路基