不飽和土の三軸圧縮試験における乾燥とせん断に伴う側方変形挙動

The application of suction on a saturated soil specimen consolidated in an oedometer may cause the lateral shrinkage and therefore the condition of the one dimensional compression will not be implemented. This study tries to simulate such situation using triaxial testing apparatus and to quantify the lateral deformation due to drying and shearing. Main conclusions are as follows: (1) lateral shrinkage occurs when suction is applied under the anisotropic stress condition, and (2) with increasing the shear stress, the lateral compressive strain, which occurred due to the drying, will reduce and, at some raised level of the shear stress, it will turn to be expansive.