冻结速度对铜川砂岩损伤CT数变化规律研究  

STUDY ON THE EFFECT OF FREEZING RATE ON THE DAMAGE CT VALUES OF TONGCHUAN SANDSTONE

作　　者：杨更社[1,2] 张全胜[1,2] 任建喜[1,2] 蒲毅彬[3] 

机构地区：[1]西安科技大学建筑与土木工程学院 [2]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 [3]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

出　　处：《岩石力学与工程学报》2004年第24期4099-4104,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金(40372119;1072047);教育部优秀青年教师基金(2091);陕西省自然科学基金;冻土工程国家重点实验室基金(200104)资助课题。

摘　　要：在寒区岩土工程中,季节性冻融是温度由正温经过数月缓慢变化到负温的过程及其逆过程,而昼夜冻融和气候骤变造成的冻融是温度由正温经过较短时间迅速变化到负温的过程及其逆过程。因此,研究冻结速度对岩石损伤结构的影响具有重要意义。利用 CT 扫描技术和岩石冻融实验,探讨了开放环境下冻结速度对 3 种铜川砂岩损伤扩展的影响,运用扫描层面内 CT 数统计频率分析法着重对冻融岩样扫描层面内的 CT 数变化规律进行分析,对寒区岩土工程具有一定的指导意义。In cold regions, seasonal freezing and thawing are characterized by temperatures dropping slowly from positive to negative or rising slowly from negative to positive. However, the day-and-night freezing and thawing are characterized by fast temperature dropping and rising. Thus, it is very important to study the damage CT values of rock subjected to different freezing rates. The damage CT values of three kinds of Tongchuan sandstone are studied subjected to different freezing rates under open circumstances. Freezing and statistic frequency are used to analyze the characteristics of damage CT values, which can be referred to geotechnical engineering in the cold region.

关 键 词：损伤力学 CT数 冻结速度 砂岩 

分 类 号：O346.5[理学—固体力学]