冻结方式影响试样内部结构变化的CT研究  

Impact of Freezing on Water Content and Dry Density Distribution by CT Technology

作　　者：郑剑锋[1] 马巍[1] 赵淑萍[1] 蒲毅彬[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：《中国矿业大学学报》2010年第1期80-86,共7页Journal of China University of Mining & Technology

基　　金：国家自然科学基金创新群体项目(40821001);国家自然科学基金项目(40801024;40801026)

摘　　要：利用CT技术可以在不破坏土体结构的情况下,连续不间断的观测到土体试样内各局部区域参数的变化.研究了两种粉质黏土试样分别以不同冻结方式进行冻结,并对试样进行了无损CT扫描,比较了冻结前后的CT数变化,由此定量得到试样内部各区域含水量和干密度的变化程度.结果表明:对于初始均匀的试样而言,不同冻结方式,对试样冻结后其内部含水量和干密度的变化的影响程度及趋势是不同的,比较而言,轴向冻结方式对冻土试样内部含水量的变化影响要小于径向冻结方式.Without destroying the inner structure of soil samples, the Computer Tomography （CT） testing technology can be used to observe the change of parameters in samples. Two kinds of silty clay samples made by different freezing types were scanned by this technology. Some conclusions can be drawn from the change of pre-and-post CT number and the extent of re-distribution of water content and dry density in a sample can be got quantificationally. Different ways of freezing have different effects on those initial standard samples. It can cause different extent of impact and trend of change, correspondingly. The axial freezing process has little influence on dry density and water content distribution than triaxial freezing process.

关 键 词：轴向冻结 径向冻结 粉质黏土 CT检测 干密度 含水量 

分 类 号：TU411.92[建筑科学—岩土工程]