小浪底工程中原状泥化夹层的动三轴试验
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摘要
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，提出了泥化夹层的动力总强度指标
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.
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.
引文
1水利部黄委会勘测规划设计院．《黄河小浪底水利枢纽工程初步设计工程地质勘察报告》．1986．2陈愈炯等．坝基软弱夹层性质的研究总报告．水利水电科学研究院与黄委会设计院科研所．1990．3WangSijing，XueShouyi．ExperimentalStudyontheDynamicPropertiesofWeakIntercalationsinRockMas．ScientiaGeologicaSinica，1992，1（1）：119～128．4王思敬，薛守义．小浪底左岸单薄分水岭地震稳定性研究报告．中国科学院地质所，1990．5陈厚群．黄河小浪底多孔板泄洪方案对山体围岩振动影响咨询报告．水利水电科学研究院，1988．
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