粉煤灰筑坝的动力特性试验研究

Experimental study on dynamic characteristics of flyash for dam

利用振动三轴仪对饱和粉煤灰的动模量、阻尼比和动强度进行了试验,研究了动应变、固结压力、试样密度、初始剪应力等影响因素。试验结果表明,动模量随动应变增减成倍成量级增减,并随固结压力、试样密度、初始剪应力增减而增减,阻尼比随应变增大而增大。抗液化强度随固结压力、试样密度、初始剪应力的增加而增加,但初始剪应力的增加量是有一定限度的。

The test of dynamic modulus, damping ratio and dynamic strength of saturated flyash is made by vibration triaxial instrument for study many influencing factors dynamic strain, consolidation pressure, sample density and initial shear stress etc. The test results indicate that the dynamic modulus increases and decreases at double along with the increase and the decrease of dynamic strain, and the dynamic modulus increases and decreases along with the increase and the decrease of consolidation pressure, sample density and initial shear stress. The damping ratio increases along with the increase of strain. The strength resisting liquefaction increases along with the increase of consolidation pressure, sample density initial shear stress, but the increase of initial shear stress is limited.