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针对三峡库区某滑坡粉质粘土,开展了等压固结下重塑试样在低频振动下三轴动力剪切试验,研究了不同频率下土体的应力应变关系、动弹模、阻尼比的变化特性.实验结果表明:轴向动荷载作用下,随着振动次数增加各土样的变形均逐渐累积增大,且频率在0.5~2Hz范围内,在振幅相同的动荷载条件下,频率越高,动应变的累积变形越慢.在此频率范围内,动孔压经历了逐步升高到骤降的过程.振动频率越高,动模量越高,且随着动荷载幅值的增大,动模量随变形逐渐降低.变形累积到一定时,阻尼比随着频率的增加而增大,阻碍了土体的变形发展.
Aiming at the silt clay in a landslide in the Three Gorges Reservoir area, the triaxial dynamic shear tests of the remolded specimens under constant pressure are carried out under low frequency vibration. The stress-strain relations, dynamic elastic modulus and damping ratio The experimental results show that under the action of axial dynamic load, the deformation of soil samples increases gradually with the increase of vibration frequency and the frequency is in the range of 0.5 ~ 2Hz. Under the dynamic load with the same amplitude, the frequency In the frequency range, the dynamic pressure has experienced a gradual increase to a sudden drop in the process.When the vibration frequency is higher, the dynamic modulus is higher, and with the increase of dynamic load amplitude Large, dynamic modulus decreases gradually with deformation.When the deformation is accumulated to a certain extent, the damping ratio increases with the increase of frequency, which hinders the deformation development of soil.