タイヤチップおよびタイヤチップ混合砂の単調および繰返しせん断特性

抄録

To investigate the monotonic and cyclic shear characteristic of the tire chips and the tire chips-sand mixture, a series of monotonic and cyclic triaxial tests were performed under CD and CU conditions using the three kinds of tire chips. From the results of monotonic triaxial tests, in spite of the different particle size of the tire chips, the deviator stress showed linear behaviour with loading up to 20 % axial strain. And during unloading, a hysteresis curve was drawn and some residual plastic strain was induced. The volumetric strain showed a contract trend during loading, and it was restored after unloading tests. The strength of sand mixture was smaller than that of the pure sand, and drastic decrease in strength appeared when the tire chips fraction is more than 0.5. From undrained cyclic triaxial tests, in the case of a tire chips fraction of 0 and 0.3, the material shows almost liquefaction at the final stage of the cyclic loading, whereas in mixtures with tire chips fraction of more than 0.5, no liquefaction occurred.