曹培, 杜雨坤. 2019: 红砂岩风化土湿化特性的三轴试验研究. 工程地质学报, 27(4): 819-824. DOI: 10.13544/j.cnki.jeg.yt2019800
    引用本文: 曹培, 杜雨坤. 2019: 红砂岩风化土湿化特性的三轴试验研究. 工程地质学报, 27(4): 819-824. DOI: 10.13544/j.cnki.jeg.yt2019800
    CAO Pei, DU Yukun. 2019: EXPERIMENTAL STUDY ON WETTING DEFORMATION AND STRENGTH BEHAVIOR OF A RED SANDSTONE WEATHERED SOIL. JOURNAL OF ENGINEERING GEOLOGY, 27(4): 819-824. DOI: 10.13544/j.cnki.jeg.yt2019800
    Citation: CAO Pei, DU Yukun. 2019: EXPERIMENTAL STUDY ON WETTING DEFORMATION AND STRENGTH BEHAVIOR OF A RED SANDSTONE WEATHERED SOIL. JOURNAL OF ENGINEERING GEOLOGY, 27(4): 819-824. DOI: 10.13544/j.cnki.jeg.yt2019800

    红砂岩风化土湿化特性的三轴试验研究

    EXPERIMENTAL STUDY ON WETTING DEFORMATION AND STRENGTH BEHAVIOR OF A RED SANDSTONE WEATHERED SOIL

    • 摘要: 针对红砂岩风化土遇水易湿化、崩解,从而影响路基填筑体稳定性的问题,选取某高速公路红砂岩风化料,采用单线法,在两种密度条件下进行了三轴湿化变形试验,分析了密度、围压和应力水平对湿化轴向应变的影响规律,并对湿化后试样的后续剪切强度进行了研究。试验结果表明:随着围压的增大和应力水平的提高,红砂岩风化料的湿化轴向变形有明显提高;而随着密实度的增加,湿化轴向变形有所减小。同一围压下,湿化轴向应变随着应力水平的增长而增大,两者近似呈线性关系。湿化后试样的峰值强度随应力水平的增加略有降低,而且普遍低于饱和状态试样的峰值强度。

       

      Abstract: The disintegration and collapsibility of weathered red sandstone soil after wetting process can put a great threat on the stability of embankment. This paper investigates the wetting deformation and strength behavior of the red sandstone weathered soil. We performed a series of triaxial tests in this research using single lines method. The paper evaluates the effects of density, confining pressure and stress level on wetting axial strain. It observes that, wetting axial strain increases with the increase of both the confining pressure and the stress level, while decreases with the increase of density. The test results reveal that the wetting axial strain exhibits a linear relationship with the stress level, and an empirical expression is proposed based on the test results. In addition, the peak strength of the specimen after wetting decreases slightly with the increase of stress level, and is lower than the peak strength under saturated states.

       

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