Experimental Study On The Strain Localization Of Shanghai Soft Clay

In practical engineering, some great engineering accidents, such as instability of pit, failure of the soil and etc., almost are the progressive failure procedure of localization under plane strain condition, that is shear band phenomenon. During a long time, there is a little understanding of the shear band phenomenon. In order to make a further research on the shear band phenomenon, a plane strain apparatus was developed, and a series of consolidated undrained plane strain compression tests of Shanghai intact silty clay, layer-5 gray slity clay, was carried on. Most of the sample's response during the shearing procedure, such as the stress-strain response, the development of pore water pressure, and the evolution of local lateral non-homogeneous deformation, were recorded. On the basis of the experimental results, the shear band formation in Shanghai intact silty clay under the condition of plane strain was analyzed and investigated quantitatively: summerize the standards of judgement the shear band beginning, and make out a new judgement that is by water pressure's sudden change; get the full information of the following special points: shear band beginning point, the peak, and the shear band fully formation point, measure the shear band angle . Because the expriment apparatus are limited, my work is just a little step further in the clay's shear band research, there are still many works for us to carry out.