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목영진,박치원,박동선 경희대학교 산학협력기술연구원 2006 산학협력기술연구논문집 Vol.12 No.1
Strength evaluation of soft soils is a formidable task because of difficulties in sampling, specimen preparation and setting in triaxial cells. In undrained triaxial testing, sampling disturbance, verticality of specimen and bedding effect give a great influence on shear strength measurements. On the other hand, shear wave measurements of specimens are less influenced by these factors. In this research, the bender elements were attached to top cap and base pedestal of triaxial cell and shear wave velocities were measured. To initiate a methodology to evaluate shear strength indirectly by measuring shear wave velocity, a relationship between shear strength and shear wave velocity was developed with kaolinite specimens consolidated in the laboratory. Undrained shear strength turns out to increase linearly with shear wave velocity. Stress-strain curves can also be predicted with a hyperbolic model and shear wave measurements.
전단파계측을 이용한 연약지반의 압밀상태 평가와 전단강도 결정
목영진,박철수,정재우,박치원 경희대학교 산학협력기술연구원 2005 산학협력기술연구논문집 Vol.11 No.4
Undrained shear strength of specimen re-consolidated with in-situ effective stress was compared with those calculated from c/p ratio. Also, shear wave velocities of re-consolidated specimens using bender element measurements were compared with in-situ shear wave velocity profiles using MASW(multichannel analysis of surface waves). Re-consolidated shear strength is under the c/p ratio line and in-situ shear wave velocity profiles is less than the one of the normally consolidated specimen using bender element measurements. These results indicate that the soft clay layer is under consolidated.