上海粘性土局部化变形的平面应变试验研究

An Experimental Study on Plane Strain Compression Tests of Localized Deformation in Shanghai Clay

采用可量测局部变形的平面应变仪 ,对上海粘性土原状土样进行固结不排水平面应变压缩条件下局部化变形的试验研究 ,试验表明 :上海原状粘性土在固结不排水平面应变压缩试验过程中 ,确实存在局部化变形 ,土样经历了变形分叉、偏应力峰值、剪切带破坏到残余偏应力等阶段的渐进性破坏过程 。

With the plane strain apparatus capable of measuring local lateral strain, a series of consolidated non drainage plane strain compression tests are carried out on Shanghai undisturbed clay samples. A localized deformation was really observed in these tests. During the tests, the samples experienced the process of progressive failure, including strain bifurcation, deviating stress peak, full formation of shear bands and residual deviating stress in sequence. Some qualitative laws of localized deformation for Shanghai clay were presented.