饱和砂砾料液化特性的试验研究
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摘要
本文通过大型动三轴往返加荷试验( 试样尺寸30 ×75cm) , 研究了不同含砾量35 % 、50 % 、65 % 、80 % 和不同排水条件对饱和砂砾料液化特性的影响. 研究结果表明, 在不排水条件下, 以初始液化作为破坏标准, 含砾量不同对饱和砂砾料的抗液化强度影响不大; 而在排水条件下, 饱和砂砾料的抗液化能力则随着含砾量的增大而提高. 排水条件下饱和砂砾料的动强度比不排水条件下的要高得多, 而变形则明显小于不排水条件下的变形.
Large scale cyclic triaxial tests on saturated sandy gravel with specimen size 30×75 cm were performed to investigate the effect of different gravel content and drainage condition on the liquefaction behavior of sandy gravel. Test results show that, with initial liquefaction as failure criterion, gravel contents have little influence on liquefaction resistance strength of sandy gravel under undrained condition, but under drained condition the liquefaction resistance of sandy gravel increases significantly with increase of gravel content. It is found that drainage conditions exert a significant effect on liquefaction characteristics of sandy gravel. Cyclic strength of drained sandy gravel specimen is much higher than that of undrained sandy gravel specimens, and the deformation is much smaller.
引文
[1]  刘令瑶, 李桂芬, 丙东屏. 密云水库白河主坝保护层地震破坏及砂砾料振动液化特性[C] . 水利水电科学研究院科学研究论文集. 北京: 水利出版社, 1982 .
    [2]  汪闻韶, 常亚屏, 左秀泓. 饱和砂砾料在振动和往返加荷下的液化特性[C] . 水利水电科学研究院科学研究论文集. 北京: 水利电力出版社, 1986 .
    [3]  中华人民共和国水利部主编. 中华人民共和国国家标准, 土的分类标准GBJ1490 [S] . 北京: 中国计划出版社, 1991 .
    [4]  中华人民共和国水利电力部. 土工试验规程SD12887 [S] . 第三分册( 第二版) , 北京: 水利电力出版社, 1989 .

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