路钊驰,杨忠年,刘继明,等. 2021. 冻结橡胶加筋膨胀土(ESR)的动力特性研究[J]. 工程地质学报,29(5):1312-1319. doi: 10.13544/j.cnki.jeg.2021-0496.
    引用本文: 路钊驰,杨忠年,刘继明,等. 2021. 冻结橡胶加筋膨胀土(ESR)的动力特性研究[J]. 工程地质学报,29(5):1312-1319. doi: 10.13544/j.cnki.jeg.2021-0496.
    Lu Zhaochi, Yang Zhongnian, Liu Jiming, et al. 2021. Low-temperature dynamic triaxial testing of frozen expansive soil-rubber (ESR) mixtures[J]. Journal of Engineering Geology, 29(5): 1312-1319. doi: 10.13544/j.cnki.jeg.2021-0496.
    Citation: Lu Zhaochi, Yang Zhongnian, Liu Jiming, et al. 2021. Low-temperature dynamic triaxial testing of frozen expansive soil-rubber (ESR) mixtures[J]. Journal of Engineering Geology, 29(5): 1312-1319. doi: 10.13544/j.cnki.jeg.2021-0496.

    冻结橡胶加筋膨胀土(ESR)的动力特性研究

    LOW-TEMPERATURE DYNAMIC TRIAXIAL TESTING OF FROZEN EXPANSIVE SOIL-RUBBER(ESR) MIXTURES

    • 摘要: 作为轻质、高压缩性、弹性大的材料,橡胶加筋土已成功在岩土工程中应用。许多学者对常温条件下的橡胶加筋土进行了一系列静力和动力性能的研究。然而,我国作为世界第三大冻土国家,冻结状态下橡胶加筋膨胀土(Expansion Soil-Rubber,ESR)的动力特性研究还相对处于空白。本文通过低温动三轴试验,研究了冻结条件下橡胶加筋膨胀土(ESR)的动力响应特性,阐释了橡胶掺量对ESR的影响。结果表明:(1)冻结时ESR的滞回曲线呈椭圆形,随橡胶掺量的增加,滞回曲线逐渐变扁平;(2)ESR的剪应力略低于素膨胀土,在橡胶掺量为10%时,ESR的剪应力最小;(3)随着橡胶掺量和剪应变的增大,ESR的剪切模量逐渐减小;(4)在冻结过程中,素膨胀土与ESR的阻尼比皆随剪应变的增加而减小,相比于素膨胀土,ESR的阻尼比要更大。

       

      Abstract: As a lightweight,highly compressible and elastic material,the rubber reinforced soil has been successfully applied in geotechnical engineering. Many researchers have studied the static and dynamic properties of rubber mixtures at room temperature. However,as the third largest frozen soil country in the world,the research on dynamic characteristics of expansive soil-rubber (ESR) mixture in frozen state is still relatively blank. In this paper,the dynamic response characteristics of expansive soil-rubber (ESR) under freezing condition are studied with low-temperature dynamic triaxial test. The results show that:(1)The hysteresis curve of ESR during freezing is oval,and it becomes flat with the increase of rubber content; (2)The shear stress of ESR is slightly lower than that of expansive soil. When the rubber content is 10%,the shear stress of ESR is the smallest; (3)The shear modulus of ESR decreases with the increase of rubber content and shear strain; (4)During the freezing process,the damping ratio of expansive soil and ESR decreases with the increase of shear strain,and the damping ratio of ESR is larger than that of pure soil.

       

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