INFLUENCE OF STRAIN RATE ON UNDRAINED SHEAR CHARACTERISTICS OF K0-CONSOLIDATED COHESIVE SOILS

• Published in: SOILS AND FOUNDATIONS Vol. 26; no. 1; pp. 85 - 95
• Main Authors: NAKASE, AKIO, KAMEI, TAKESHI
• Format: Journal Article
• Language: English
• Published: The Japanese Geotechnical Society 01.01.1986
• Subjects: triaxial compression test
• ISSN: 0385-1621; 0038-0806
• DOI: 10.3208/sandf1972.26.85

In order to investigate the influence of strain rate on undrained shear characteristics of normally consolidated cohesive solis, K0-consolidated undrained triaxial compression and extension tests were performed on three kinds of cohesive soils with different plasticity index Ip under different strain rate.The conclusions from this study are : 1) The maximum principal stress difference and axial strain at failure εf increase with the increase of strain rate, whereas the pore pressure coefficient Af decreases.2) The magnitude of excess pore pressure, both in the compression and extension tests, at the same strain is found to be smaller as the strain rate increases in the case of plastic clay. This trend does not become clear as the plasticity index decreases.3) Initial portion of effective stress path progresses approximately elastically from the point of K0 consolidation for all the specimens, irrespective of different strain rates.4) The undrained shear strength anisotropy at high strain rate becomes smaller than that at low strain rate.