砂のせん断抵抗について

Abstract

In this paper, shearing resistance of sand is considered on the base that the resistanceto dilatancy depends on the mean normal stress σm. The triaxiial compression tests werecarried Out keeping σm constant. From these test, following results were obtained.1) The smaller the mean normal stress Om is, the larger the strees ratio (σ1 -σ3)/σmat failure. One of the reason of this fact is that d(ΔV/V)/dr at failure is larger atsmaller σm (ΔV/V: volume change, r: shear strain).2) The relationship between sin y and d(ΔV/V)/dr may be represented by straight line.3) The shearing resistance of sand mobilized with shear strain is not only affected bythe mean normal stress and the void ratio but also by strain or stress history.