| 冻土单轴压缩损伤特征与细观损伤测试 |
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| 引用本文： | 刘增利,李洪升,朱元林.冻土单轴压缩损伤特征与细观损伤测试[J].大连理工大学学报,2002,42(2):223-227. |
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| 作者姓名： | 刘增利 李洪升 朱元林 |
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| 作者单位： | 1. 大连理工大学,工程力学系,辽宁,大连,116024;中国科学院兰州寒区旱区环境与工程研究所,冻土工程国家重点实验室,甘肃,兰州,730000
2. 中国科学院兰州寒区旱区环境与工程研究所,冻土工程国家重点实验室,甘肃,兰州,730000 |
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| 基金项目： | 中国科学院兰州寒区旱区环境与工程研究所冻土工程国家重点实验室资助项目 (980 1) |
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| 摘 要： | 基于冻土单轴压缩的CT动态测试，提出冻土单轴压缩下的损伤由完全不同的两个阶段组成：其一是塑性硬化下的塑性损伤，其二是由于新产生的裂隙造成的微裂纹损伤。对两种不同损伤阶段下冻土微结构变化特征进行了讨论，给出了各阶段损伤计量计算公式。采用该方法分别对饱水冻土试样和未饱水冻土试样的损伤量进行了计算，得到了塑性损伤和微裂纹损伤阶段的损伤量及总附加损伤量。得出饱水冻土的塑性损伤和微裂纹损伤产生的应变条件门槛值分别为0．75％和5．0％，未饱水冻土的分别为0．70％和4．5％。
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| 关 键 词： | 冻土 单轴压缩 损伤特征 损伤计算 塑性损伤 微裂纹损伤 CT动态测试 |
| 文章编号： | 1000-8608(2002)02-0223-05 |
Damage characteristics and micro-crack damage measurement of frozen soil under uni-axial compression |
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| LIU Zeng li ,LI Hong sheng ,ZHU Yuan lin.Damage characteristics and micro-crack damage measurement of frozen soil under uni-axial compression[J].Journal of Dalian University of Technology,2002,42(2):223-227. |
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| Authors: | LIU Zeng li LI Hong sheng ZHU Yuan lin |
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| Institution: | LIU Zeng li 1,2,LI Hong sheng 1,2,ZHU Yuan lin 2 |
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| Abstract: | Based on timely CT experimental investigation of uni axial compression, the damage process of the frozen reconstructed soil is separated into two stages. The first stage is the plastic damage, the second one is micro crack damage. Variation of micro structure traits of the frozen soil under each stage was discussed, measurement methods for different kinds of damage were established. After that, for the saturated frozen soil, 0.75% and 5.0% are declared as the critical condition strain values to the plastic damage and micro crack damage respectively, 0.70% and 4.5% for that of unsaturated frozen soil. In the conclusion, the damage values of the saturated and the unsaturated frozen soil under each stage were judged. |
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| Keywords: | frozen soil/uni axial compression damage characteristics damage measurement |
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