INVESTIGATION OF NEOGENE-TERTIARY DAM FOUNDATION IN JAPAN

Abstract

The mudstone of Neogene-tertiary time has strong tendency of being effected by creep.
The in-situ long time loading tests (24 hours) were conducted by a disk jack to compare with the results of the rapid loading tests. The residual deformation of the former is 10 times that of the latter; the modulus of elasticity decreases with the increasing loading stress by 50% in Maximum.
The difference of results in laboratory tests is less than that in in-situ tests. But there is also tendency of decrease in the modulus of elasticity and compression strength.