软土单轴固结CT实验研究  

Soft Soil Uniaxial Consolidation Experiment with CT

作　　者：毛灵涛[1,2] 赵丹[3] 袁则循[2,4] 周凯[2] 

机构地区：[1]煤炭资源与安全开采国家重点实验室,北京100083 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083 [3]中国电子工程设计院,北京100840 [4]北京城市学院城建学部,北京100083

出　　处：《CT理论与应用研究（中英文）》2013年第1期33-40,共8页Computerized Tomography Theory and Applications

基　　金：教育部博士点新教师基金资助项目(20070290010);中央高校基本科研业务费专项资金资助项目(2009QM02);国家重点基础研究发展计划(973计划)项目(2010CB732002)

摘　　要：以天津港北港池码头地区海相沉积软土为研究对象,自行研制了与CT配套的单轴固结装置,取不同深度的土样分别进行单轴固结实验。逐级加载土样固结后,对土样进行CT扫描,结合CT图像分析软土固结过程中特性变化。研究表明:随着压力的增加,CT图像灰度平均值逐渐增大,说明土样被压实,密度增大;固结过程中,不同种类土样的CT图像标准差变化存在差异性,这与孔隙水压力消散引起土样内部结构的变化有关;引入CT图像灰度压缩系数来反映土样的压缩性能,研究结果表明天津港北港池码头软土具有较高的压缩性。In this paper, the marine sediment soft soil of Beigangchi Wharf in Tianjin Port was scanned by Computer Tomography （CT） in different load during uniaxial consolidation experiment. With the CT images, the soil characteristics during consolidation were analyzed. The results show that： with the pressure growth, the average grey value of the CT images increases gradually, which indicates that soil samples are compacted and the density increases. During consolidation, the pore-water pressure dissipation leads to the structure change in the soil, which makes different trends of CT image grey standard deviation for different kinds soil. Grey compression coefficient is introduced to evaluate the soil compressibility. According to the changes of grey compression coefficient, it is illustrated that the soft soil of Beigangchi Wharf in Tianjin Port has high compressibility.

关 键 词：软土 CT扫描 单轴固结 图像分析 

分 类 号：U652.2[交通运输工程—港口、海岸及近海工程]