基于图像测量技术的非饱和黄土固结变形试验研究

为了研究非饱和重塑黄土在三轴试验条件下的湿陷变形，利用自主研发的三轴试验土样变形数字图像测量系统，对其在均等围压下的三轴固结变形进行了初步研究。研究了非饱和黄土固结变形过程中轴向应变、径向应变、体积应变和时间之间的关系以及体积应变和压力之间的关系，并对比了单轴压缩试验和三轴压缩试验中体积应变和压力的关系。试验研究表明，在含水率一定的条件下轴向应变、径向应变和体积应变与时间的关系可以用双曲线模式表达，其表征最终变形量的参数依赖于均等固结压力。

Application of triaxial digital image processing technique to consolidation deformation of unsaturated remolded loess

Digital image processing technique developed by Dalian University of Technology is used to perform triaxial consolidation tests in order to study the collapse deformation of unsaturated remolded loess. The volumetric changes of samples can be accurately measured in consolidation process by the untouched measures technique. Relations between axial strain, radial strain, volume strain and time and relation between volume strain and stress are examined. Under the condition of fixed water content, the relationship between axial strain, radial strain, volume strain and time can be expressed in hyperbolic model, in which the parameter that stands for the final deformation depends on the uniform consolidation pressure.