粘性土の三軸伸張および等方圧縮挙動に対するせん断履歴の影響

Abstract

In order to clarify the effects of shear stress history on stress strain behaviours in triaxialextension and isotropic compression of a remoulded clay, samples which were initially normal-consolidated and subsequently subjected to shear deformation by loading-unloading cycle in triaxialcompression, were sheared under p-constant drained condition in triaxial extension or consolidatedisotropically.Conclusively, it is as follows that are clarified:1) inside the State Boundary Surface (SBS) defined in (p, q, e) space, volume change behaviourat const. P is relatively subject to the effect of shear stress history although shear strain behaviour isnot.2) plasticity theory of isotropic hardening type is not available to describe the shearing behaviourinside SBS, but is appeared to be predictable for isotropic compression behaviour of samples havingsubjected to shear stress history, and3) over-consolidation ratio (OCR) defined by Cam Clay model, of pre-sheared samples, in spheri-cal stress condition are not appropriate to describe stress-strain behaviours inside SBS.