高温冻结粘土单轴随机损伤本构模型及强度分布规律  

Stochastic Damage Constitutive Model for Warm Frozen Soil under Uniaxial Compression and Its Strength Distribution

作　　者：赖远明[1] 李双洋[1] 高志华[1] 常小晓[1] 

机构地区：[1]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

出　　处：《冰川冻土》2007年第6期969-976,共8页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金重点项目(40730736);国家杰出青年科学基金项目(40225001);中国科学院知识创新工程重要方向项目(KZCX3-SW-351);国家自然科学基金项目(40601023)资助

摘　　要：从高温冻土内部裂隙、空洞等缺陷的随机分布出发,基于连续损伤理论和概率与数理统计理论,建立了高温冻土的单轴随机损伤本构模型,并利用3种不同试验温度下的实测数据与之对比分析.结果表明:模型能较好地反映高温冻土破坏的全过程,特别是其软化特性.同时,通过冻土强度的实测与理论概率分布的比较,发现Weibull分布能很好地反映高温冻土的强度分布规律.最后,基于高温冻土强度服从Weibull分布,进行了高温冻土强度的可靠度分析.Based on the characteristics of random distribution of defects such as fissure and void in warm frozen soil, a stochastic damage model for warm frozen soil under uniaxial compression is dev＇eloped by using continuous damage theory and probability and statistic theory. And it is compared with experimental data in three different temperatures. The results show that, the whole damage process, especially its softening characteristic, can be well expressed by this model. Meanwhile, based on the comparison between experimental and theoretical probability distribution of strength of warm frozen soil, it is found that the Weibull dis- tribution could well describe the strength distribution of frozen soil. At last, by using the idea that the strength of warm frozen soil satisfies with Weibull distribution, the reliability of strength of warm frozen soil is investigated.

关 键 词：高温冻土 损伤本构 WEIBULL分布 强度 

分 类 号：TU452[建筑科学—岩土工程] P314.5[建筑科学—土工工程]