( 3 ) study of triaxial test of dry soil and the formation of shear band in triaxial specimen of fly ash . because the digital image processing technique can directly measure the axial and radial deformation of soil specimen in any moisture , general triaxial apparatus can be used to do the triaxial test of dry soil . in the study of the triaxial test of dry soil , the stress - strain characteristic is compared with that of the saturate soil at the same condition （ 3 ）干土的三轴试验以及粉煤灰三轴试样剪切带形成的试验研究：利用土样变形数字图像测量技术可以直接量测任意含水量土样的轴向和径向变形，对干土和饱和土进行三轴试验，比较了干土和相同条件下饱和土的应力应变特性。
