Soft Soil Uniaxial Consolidation Experiment with CT
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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。Abstract: 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.
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Keywords:
- soft soil /
- CT scanning /
- uniaxial consolidation /
- image analysis
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