| 深部人工冻土在小应变条件下的刚度特性 |
| |
| 引用本文： | 王大雁,马巍,常小晓,吴志坚.深部人工冻土在小应变条件下的刚度特性[J].岩土力学,2006,27(9):1447-1451. |
| |
| 作者姓名： | 王大雁 马巍 常小晓 吴志坚 |
| |
| 作者单位： | 中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,兰州,730000 |
| |
| 基金项目： | 国家自然科学基金;中国科学院"西部之光"人才培养计划;国家自然科学基金 |
| |
| 摘 要： | 以K0固结后在受载状态下冻结的冻结土体为研究对象,利用代表土体刚度特征的割线弹性模量,研究了在应变不超过0.5%时,深部人工冻土的刚度随应变发展变化的趋势,分析了造成K0固结后冻结土体杨氏模量与未冻土体杨氏模量较大差异的原因,讨论了冻结温度和初始围压对K0固结后在受载状态下冻结的冻土刚度大小的影响以及对冻土屈服后刚度衰减速度的影响.
|
| 关 键 词： | K0固结 人工冻土 刚度特性 |
| 文章编号： | 1000-7598-（2006）09-1447-05 |
| 收稿时间： | 2004-11-30 |
| 修稿时间： | 2004年11月30 |
Small-strain stiffness properties of frozen soils in deep alluvium |
| |
| WANG Da-yan,MA Wei,CHANG Xiao-xiao,WU Zhi-jian.Small-strain stiffness properties of frozen soils in deep alluvium[J].Rock and Soil Mechanics,2006,27(9):1447-1451. |
| |
| Authors: | WANG Da-yan MA Wei CHANG Xiao-xiao WU Zhi-jian |
| |
| Institution: | State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou 730000, China |
| |
| Abstract: | The small-strain stiffness characteristic of artificially frozen soil in deep alluvium was investigated at different initial confining pressures and frozen temperatures by secant Young’s modulus representing the soil stiffness. The influence of freezing on stiffness is investigated by comparing the behavior of frozen and unfrozen soils with similar conditions. It is observed that the variation of Young’s modulus E0 with the confining pressure, represented the magnitude of the initial stiffness, mainly depends on the variation of ice in frozen soils with the confining pressure, not on the soil itself. The frozen soils secant Young’s modulus may decay with increasing strain after keeping a stage of constant value, the threshold yield strain was found to be approximately 0.05 % for all tested conditions. On the other hand, the stiffness of studied frozen soils and its degradation was heavily response to the initial confining pressure amplitude and temperature fluctuation. |
| |
| Keywords: | K0 consolidation artificially frozen soil stiffness characteristic |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
|
