冻结温度对岩石细观损伤扩展特性影响研究初探  

Preliminary study on meso-damage propagation characteristics of rock under condition of freezing temperature

作　　者：杨更社[1] 张全胜[1] 蒲毅彬[2] 

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710054 [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,甘肃兰州730000

出　　处：《岩土力学》2004年第9期1409-1412,共4页Rock and Soil Mechanics

基　　金：国家自然科学基金(编号:40372119; 10072047);教育部优秀青年教师基金(编号:2091);陕西省自然科学基金(编号:2003D05);冻土工程国家重点实验室基金(编号:200104)资助项目部分内容

摘　　要：岩石冻融过程的细观损伤研究是近年来冻融损伤研究的一个新方向。岩石中的水分一般含有各种盐分,而盐分的存在降低了水的冰点,同时岩石本身的结构构造和力学性能也有差异性,这就使得岩石的冻结问题更为复杂,笔者采用三种不同岩样,首先,使其饱水;然后,将其分别降低到 0 ℃,-10 ℃和-20 ℃,利用 CT 扫描实验技术,研究了不同冻结温度条件下岩石内部的细观损伤扩展机理、水分迁移、冰的形成及其损伤结构的变化。利用区段划分的手段和区段统计频率,分析了损伤演化过程,对寒区岩土工程的研究具有一定的指导意义。The damage propagation problem of rock under the freezing condition is a new study direction of rock damage mechanics. The water in the rock contains some kinds of salts, which lowers the freezing temperature; on the other hand, the differences of rock structure and mechanical properties make the damage propagation problem of rock under the freezing condition complicated. Three kinds of rock samples are adopted to study the meso-damage propagation characteristics of rock under condition of freezing temperature. Firstly, the rock samples are separately saturated with water, and then the circumstance temperatures are lowered to 0°C, -10°C, and -20°C, finally, we use CT technique to study the meso-damage propagation characteristics of rock, water migration and other changes of damage structure. It is believed that the study of the paper contributes to the geotechnical engineering in the cold region.

关 键 词：冻结温度 岩石损伤 CT扫描 

分 类 号：TU455[建筑科学—岩土工程]