小浪底工程中原状泥化夹层的动三轴试验

Dynamic Triaxial Test of the In situ Siltized Intercalations in Xiaolangdi Project

对黄河小浪底工程左岸山体含泥化夹层的岩芯试样进行了动三轴试验研究。结果表明：当总剪应力比α较小时，试样变形随振次增加而趋向稳定，而当α大于０．４时，变形随振次增加呈破坏性发展趋势；试样的动强度随振次增加而减小，在振次达到千次后趋向稳定。根据试验成果，并结合山体的实际条件。

The dynamic triaxial shear test on the dynamic properties of the Xiaolangdi in situ siltized intercalations within core samples is performed.The result indicates that shear deformation of the intercalation tends stable with the cyclic number when the total shear stress ratio α is smaller and takes a distructive trend when α is larger than 0.4 approximately .It is also found that the dynamic strength decreaes together with the cyclic number and tends to a certain value when the cyclic number attains one thousand.According to the results and the practical conditions of the Xiaolangdi dam site the values of dynamic total strength parameter are recommended.