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王丽霞, 凌贤长, 徐学燕, 顾全宇, 胡庆立. 青藏铁路冻结粉质粘土动静三轴试验对比[J]. 岩土工程学报, 2005, 27(2): 202-205.
引用本文: 王丽霞, 凌贤长, 徐学燕, 顾全宇, 胡庆立. 青藏铁路冻结粉质粘土动静三轴试验对比[J]. 岩土工程学报, 2005, 27(2): 202-205.
WANG Lixia, LING Xianzhang, XU Xueyan, GU Quanyu, HU Qingli. Comparison of dynamic and static triaxial test on frozen silty clay of Qinghai-Tibet Railway[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(2): 202-205.
Citation: WANG Lixia, LING Xianzhang, XU Xueyan, GU Quanyu, HU Qingli. Comparison of dynamic and static triaxial test on frozen silty clay of Qinghai-Tibet Railway[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(2): 202-205.

青藏铁路冻结粉质粘土动静三轴试验对比

Comparison of dynamic and static triaxial test on frozen silty clay of Qinghai-Tibet Railway

  • 摘要: 直接针对采自青藏铁路工程中的粉质粘土,根据低温动、静三轴试验结果,进行了冻土的动强度与静强度对比研究。研究表明,冻土的静强度和动强度均随负温降低而增大、随含水率增加而减小,相应的静粘聚力、静内摩擦角和动粘聚力、动内摩擦角随负温及含水率的变化规律也如此;冻土的动强度随围压上升而增大;冻土的静力变形明显存在弹性、塑性两个不同性质的变形发展区,冻土的静强度在塑性变形区随围压上升有增大的趋势,但在弹性变形区这一变化规律不明显,并且在塑性变形区冻土静强度增长缓慢且发生一定的塑性流动;冻土的动内摩擦角随振次增大显著减小,而动粘聚力随振次变化较小。

     

    Abstract: The dynamic and static strength of frozen silty clay are studied based on the results of the low-temperature dynamic and static triaxial test with samples taken from Qinghai-Tibet Railway. It is indicated that both of the dynamic and static strength increase with the decreasing temperature, and decrease with the increasing water content.The variation of static cohesion(c), dynamic cohesion (cd), static friction angle (φ) and dynamic friction angle (φd) is same as that of strength. The dynamic strength increases with the increasing confining pressure. The static deformation is divided into elastic and plastic stages. The static strength increases with the increasing confining pressure in the plastic stage, but there no such evidence in elastic stage. The increasing rate of static strength is slow and the plastic flow occurs in plastic stage. Dynamic friction angle decrease with the increasing vibration times, however dynamic cohesion varies slightly.

     

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