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冰川冻土 ›› 1998, Vol. 20 ›› Issue (1): 42-45.

• 研究论文 • 上一篇    下一篇

冻结粉土动强度的荷载效应及长期极限动强度

沈忠言, 张家懿   

  1. 中国科学院兰州冰川冻土研究所冻土工程国家重点实验室, 兰州730000
  • 收稿日期:1997-03-18 出版日期:1998-02-25 发布日期:2012-04-26

Loading Effect of Dynamic Strength and Limit of Long-Term Dynamic Strength of Frozen Silt

SHEN Zhong-Yan, ZHANG Jia-Yi   

  1. State Key Laboratory of Frozen Soil Engineering, LIGG, CAS, Lanzhou 730000
  • Received:1997-03-18 Online:1998-02-25 Published:2012-04-26

摘要: 荷载效应包括速率效应和疲劳效应两部分。速率效应使冻土的动强度和退荷回弹动弹模随应变速率加快而提高;疲劳效应使冻土的动强度随振频增加而下降,但在低应变速率下却使动强度略有提高。在高应变速率下动强度大于静强度,在低应变速度下动强度小于静强度,其间存在一个临界应变速率。通过动强度-破坏振次关系,可确定长期极限动强度。

关键词: 动强度, 荷载效应, 速率效应, 疲劳效应, 长期极限动强度

Abstract: The dependence of dynamic strength of frozen silt on loading effect under constant strain rate are discussed in this paper. Losding effect consists of rate effect and fatigue effect. Dynamic strength and unloaded dynamic elastic modulus increase with increasing strain rate. However dynamic strength of frozen silt decreases due to fatigue effect, except for low strain rate. In high strain rate the dynamic strength is larger than the static strength of frozen soil, and in low strain rate the former is less than the later. There is a critical strain rate in between. Limit of long-term dynamic strength can be derived from the relationship between the dynamic strength and the vibratory number to failure.

Key words: dynamic strength, loading effect, strain rate effect, fatigue effect, limit of long-term dynamic strength

中图分类号: 

  • P642.14