冻结黄土的拉伸蠕变特性

doi:10.7522/j.issn.1000-0240.1995.0019

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冰川冻土 ›› 1995, Vol. 17 ›› Issue (2) : 144-151. DOI: 10.7522/j.issn.1000-0240.1995.0019 CSTR: 32264.14.j.issn.1000-0240.1995.0019

研究论文

冻结黄土的拉伸蠕变特性

沈忠言, 苗丽娜, 刘永智

作者信息 +

Some Tensile Creep Characteristics of Frozen Loess

Shen Zhongyan, Miao Lina, Liu Yongzhi

Author information +

文章历史 +

摘要

本文以试验为依据揭示饱水冻结黄土拉伸蠕变过程的若干特点。拉伸蠕变同样具有两类三阶段性质。与压缩蠕变相比,拉伸非衰减蠕变的总变形小,第Ⅲ阶段变形的比例不大,历时短,不论土温高低最终均发生脆性破坏,根据应变速率-时间曲线特征提出拉伸蠕变方程,对第Ⅲ阶段变形有较好的表述。

Abstract

Some deformation characteristics of tensile creep revealed by a test of frozen saturated loess are presented in this paper. Similar to compressive creep, decay creep and undecay creep can be distinguished. As for undecay creep, there are also three phases, i.e. steady, unsteady and failure phases. As compared with compressive creep, less deformation of tensile creep occurs until cracking. The deformation in phase Ⅲ is a little one, lasting a short time. The ultimate fracture is brittle, regardless of temperature. A creep equstion is derived from the strain rate-time curve successively, which may well describe the strain at the phase Ⅲ.

导出引用

沈忠言, 苗丽娜, 刘永智. 冻结黄土的拉伸蠕变特性[J]. 冰川冻土, 1995, 17(2): 144-151 https://doi.org/10.7522/j.issn.1000-0240.1995.0019

Shen Zhongyan, Miao Lina, Liu Yongzhi. Some Tensile Creep Characteristics of Frozen Loess[J]. Journal of Glaciology and Geocryology, 1995, 17(2): 144-151 https://doi.org/10.7522/j.issn.1000-0240.1995.0019

参考文献

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