Project/Area Number  05650475 
Research Category 
GrantinAid for General Scientific Research (C)

Allocation Type  Singleyear Grants 
Research Field 
Geotechnical engineering

Research Institution  The University of Tokushima 
Principal Investigator 
YAMAGAMI Takuo The University of Tokushima, Faculty of Engineering, Professor, 工学部, 教授 (90035642)

CoInvestigator(Kenkyūbuntansha) 
UETA Yasuhiro HANSIN CONSULTANTS CO., LTD., Consulting Engineer, 調査部, 副長
SUZUKI Hisashi The University of Tokushima, Faculty of Engineering, Associate Professor, 工学部, 助教授 (80154574)

Project Period (FY) 
1993 – 1994

Project Status 
Completed(Fiscal Year 1994)

Budget Amount *help 
¥2,200,000 (Direct Cost : ¥2,200,000)
Fiscal Year 1994 : ¥900,000 (Direct Cost : ¥900,000)
Fiscal Year 1993 : ¥1,300,000 (Direct Cost : ¥1,300,000)

Keywords  Anisotropy / Compacted soil / Shear strength / Cohesion / Angle of internal friction / Stability analysis / Slip surface / Factor of safety 
Research Abstract 
The purpose of this study is to clarify experimentally the anisotropic shear strength characteristics of a compacted soil and to develop a computer program for the slope stability analysis of embankments consisting of the soil considering the anisotoropic effect. The results may be summarized as follows : 1.A number of triaxial compression tests were conducted on the samples extracted at various angles from a compacted model ground. Then an anisotropic shear strength equation has been derived from the Coulomb equation, Mohr circles at failure and the inclination angle of the failure plane in each specimen. 2.Cohesion and angle of internal friction appearing in the shear strength equation are both functions of sample orientations. It is interesting to note that the functions have the same form as those proposed by McLamore et al.for anisotropic sedimentary rocks. 3.The cohesion and angle of internal friction are also expressed as functions of the angle between the shear plane and the bedding plane in each specimen. Stability analyzes performed based on these functions show that the shear strength anisotropy leads to smaller values of the factor of safety and flatter critical slip surfaces in shape than those obtained from the isotropic shear strength assumption.
