| 冻土蠕变过程的损伤力学模型 |
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| 引用本文： | 张蔚,马巍,蒋志荣. 冻土蠕变过程的损伤力学模型[J]. 兰州大学学报(自然科学版), 2005, 41(6): 17-20 |
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| 作者姓名： | 张蔚 马巍 蒋志荣 |
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| 作者单位： | 甘肃农业大学,林学院,甘肃,兰州,730070;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,甘肃,兰州,730000;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,甘肃,兰州,730000;甘肃农业大学,林学院,甘肃,兰州,730070 |
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| 基金项目： | 中国科学院科研项目，国家高技术研究发展计划(863计划)，科技部科研项目 |
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| 摘 要： | 参考在金属蠕变过程研究中所发展的损伤力学模型,建立了一般应力状态下,微裂隙的形成和发展影响冻土蠕变过程力学行为的损伤力学模型,从该模型得到了冻土破坏时间依赖于应力的具体函数关系.计算结果与实测数据的对比表明,该模型准确地反映了冻土蠕变过程中变形随时间发展的趋势,对破坏时间的预测也基本与实测结果一致.
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| 关 键 词： | 冻土 蠕变 损伤力学 理论模型 |
| 文章编号： | }455-2059（2005）06-0017-04 |
| 收稿时间： | 2004-06-20 |
| 修稿时间： | 2004-06-20 |
A theoretical model for the creep process of frozen soil based on damage mechanics |
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| ZHANG Wei,MA Wei,JIANG Zhi-rong. A theoretical model for the creep process of frozen soil based on damage mechanics[J]. Journal of Lanzhou University(Natural Science), 2005, 41(6): 17-20 |
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| Authors: | ZHANG Wei MA Wei JIANG Zhi-rong |
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| Affiliation: | 1. College of Forestry, Gansu Agricultural University, Lanzhou, 730070, China; 2. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China |
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| Abstract: | Referring to the damage model applied successfully in the study of the creep processes of metals, a theoretical model of damage mechanics is developed, which accounts for the effect of the formation and development of microscopic cracks on the deterioration of the mechanical properties of frozen soils. An explicit expression for the dependence of the rupture time on the stress tensor is then deduced from the model. To check the validity of the model, the creep curves under various stresses and the dependence of rupture time on stress are calculated and compared with experimental data in the literature. The results reveal that the model accurately describes the development of the strain with time in the creep process of frozen soils and the rupture times predicted for various stresses are also acceptable. |
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| Keywords: | frozen soil creep process damage mechanics theoretical model |
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