王刚,殷浩,郑含辉,等. 2021. 钙质砂与硅质砂液化特性对比试验研究[J]. 工程地质学报, 29(1): 69-76. doi: 10.13544/j.cnki.jeg.2020-624.
    引用本文: 王刚,殷浩,郑含辉,等. 2021. 钙质砂与硅质砂液化特性对比试验研究[J]. 工程地质学报, 29(1): 69-76. doi: 10.13544/j.cnki.jeg.2020-624.
    Wang Gang, Yin Hao, Zheng Hanhui, et al. 2021. Comparative experimental study on liquefaction characteristics of carbonate and silica sands[J]. Journal of Engineering Geology, 29(1): 69-76. doi: 10.13544/j.cnki.jeg.2020-624.
    Citation: Wang Gang, Yin Hao, Zheng Hanhui, et al. 2021. Comparative experimental study on liquefaction characteristics of carbonate and silica sands[J]. Journal of Engineering Geology, 29(1): 69-76. doi: 10.13544/j.cnki.jeg.2020-624.

    钙质砂与硅质砂液化特性对比试验研究

    COMPARATIVE EXPERIMENTAL STUDY ON LIQUEFACTION CHARAC TERISTICS OF CARBONATE AND SILICA SANDS

    • 摘要: 钙质砂颗粒具有形状不规则、多孔隙、强度低、易破碎等特点,较硅质砂表现出更为复杂的液化变形特性。本文对相同级配的钙质砂和硅质砂进行了物性试验、不排水循环三轴试验、轻型动力触探试验,研究两种砂在物理性质、抗液化能力和贯入阻力三方面的差异,分析实验结果得到结论如下:(1)钙质砂比硅质砂具有更大的孔隙比和内摩擦角,这与钙质砂颗粒特点相匹配;(2)砂土抗液化能力随着相对密度的增大而增大,相同相对密度下钙质砂比硅质砂具有更高的抗液化能力和抗变形能力;(3)砂土贯入阻力随着相对密度的增大而增大,相同相对密度下钙质砂比硅质砂具有更高的贯入阻力。综合不排水循环三轴试验和轻型动力触探试验的结果,指出采用陆源硅质砂地基上经验数据建立的基于贯入阻力的液化判别方法直接用于钙质砂地基可能偏保守。

       

      Abstract: Carbonate sand has the characteristics of irregular particle shape, high porosity and low particle strength, and thus exhibits more complicated liquefaction characteristics than silica sand. Physical property tests, undrained cyclic triaxial tests and light dynamic penetration tests are conducted to study the differences in physical properties, liquefaction resistance and penetration resistance between carbonate sand and silica sand. Carbonate sand is found to have larger void ratio and internal friction angle than silica sand, which is consistent with the characteristics of carbonate sand particles. The liquefaction resistance increases with increasing relative density for both sands, and it is found that under the same relative density, carbonate sand has higher liquefaction resistance than silica sand. The penetration resistance increases with increasing relative density for both sands, and it is also found that under the same relative density, carbonate sand has higher penetration resistance than silica sand. Combining the results of undrained cyclic triaxial tests and light dynamic penetration tests, it can be concluded preliminarily that the current liquefaction evaluation methods based on the empirical data on terrestrial silica sand foundations can be conservative for evaluating the liquefaction susceptibility of carbonate sand foundations.

       

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