Monitoring change of structure of road foundation soil in uniaxial compression test with CT

Uniaxial compression test of road foundation soil is conducted with a triaxial apparatus which can do CT scanning at the same time. The change of structure of the soil is analyzed from the CT numbers and CT images. It is found that the stucture of soil is lessened and the cracks are produced with the increase of the stress. The destruction of soil sample is due to the propagation of the cracks.