电厂粉煤灰筑坝的动力特性试验研究

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。试验结果可用于工程计算、类似土体及工程借鉴。

Test and Study on Dynamic Characteristics of Power Plant Flyash for Dam

Through the cyclic triaxial instrument, The tests of dynamic modulus, damping ratio and dynamic strength of saturated flyash were performed. Many factors such as dynamic strain, consolidation pressure, sample density and initial shear stress were considered. The test results indicate that dynamic modulus decreases very rapidly with strain level and increases with consolidation pressure, sample density and initial shear stress; and damping ratio increases with strain level; and dynamic strength increases with consolidation pressure, sample density and initial shear stress. But it must be noted that increment of initial shear stress is limited. The results can be used for engineering calculations, and also be referenced by similar soils and related projects.