祝艳波, 余宏明. 2015: 巴东组软岩非饱和碎屑土夹层的长期强度. 工程地质学报, 23(5): 959-964. DOI: 10.13544/j.cnki.jeg.2015.05.020
    引用本文: 祝艳波, 余宏明. 2015: 巴东组软岩非饱和碎屑土夹层的长期强度. 工程地质学报, 23(5): 959-964. DOI: 10.13544/j.cnki.jeg.2015.05.020
    ZHU Yanbo, YU Hongming. 2015: LONG-TREM STRENGTH OF WEAK INTERCALATED SOIL IN SOFT ROCK OF BADONG FORMATION. JOURNAL OF ENGINEERING GEOLOGY, 23(5): 959-964. DOI: 10.13544/j.cnki.jeg.2015.05.020
    Citation: ZHU Yanbo, YU Hongming. 2015: LONG-TREM STRENGTH OF WEAK INTERCALATED SOIL IN SOFT ROCK OF BADONG FORMATION. JOURNAL OF ENGINEERING GEOLOGY, 23(5): 959-964. DOI: 10.13544/j.cnki.jeg.2015.05.020

    巴东组软岩非饱和碎屑土夹层的长期强度

    LONG-TREM STRENGTH OF WEAK INTERCALATED SOIL IN SOFT ROCK OF BADONG FORMATION

    • 摘要: 巴东组软岩碎屑土夹层的非饱和蠕变特性明显、强度时间效应显著,研究其长期强度对含碎屑土夹层软岩路堑边坡稳定性分析有所帮助。为研究非饱和碎屑土夹层的长期强度问题,首先利用GDS非饱和三轴仪开展碎屑土夹层的非饱和强度、蠕变试验,得到其不同基质吸力下的应力-应变曲线、应变-时间曲线,分析基质吸力对其强度与蠕变特性的影响; 其次基于碎屑土夹层的蠕变曲线,利用等时曲线法确定其不同基质吸力下的长期强度。结果表明碎屑土夹层的长期强度较瞬时强度大幅降低,强度产生折损,损失率在34%~62%之间。碎屑土夹层的基质吸力越小,其长期强度越小,强度损失率越大。即巴东组软岩碎屑土夹层的饱和度越高,其强度越小,在荷载长期作用下的强度损失越大,且强度损失率增加的幅度随饱和度的增高而不断增大。

       

      Abstract: The properties of creep and time dependent behaviours of strength of weak intercalated soils in soft rock of Badong formation are obvious. To study the long-term strength of weak intercalated soils can be useful for stability analysis of the cutting slopes with weak intercalated soils. In order to study the long-term strength of the weak intercalated soils, the strength and creep tests of weak intercalated soils are carried out with a GDS unsaturated triaxial apparatus. It is to find out the effects of matrix suction on strength and creep characteristics of weak intercalated soils from the stress-strain and strain-time curves. Then the isochronous curves method is used to determine the long-term strength of weak intercalated soils based on the creep curves. The results show that the long-term strength of weak intercalated soils is reduced greatly in comparison with the instantaneous strength. The loss rate of strength is between 34% and 62%.The smaller the matrix suction is,the smaller the long-term strength and the greater the loss rate of strength can be. That is to say for the weak intercalated soils of soft rock of Badong formation, the higher the saturability is,the smaller the strength is and the greater the loss rate of strength is.The increasing range of loss rate of strength can increase with the increasing of saturability of weak intercalated soils.

       

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