締固めた凝灰岩の剪断特性

The consolidated undraind triaxial compression tests were performed with the compacted tuff used for semipermeable material of a filldam and the effects of compaction moisture content w and dry density ρ_d on shearing properties were experimented.
The following results were obtained from these test.(1) Pore pressure at failure △u_f is decreased with increment of w and ρ_d and △u_f comes to negative value. (2) The compressive strength and strength parameters c' and φ' are increased with dry density. (3) The failure criterion for noncohesive sandy soil is approximated with bi-linear envelope passed to origin.