倪静, 李杉杉, 韩玉琪, 韦毅. 2019: 加卸荷条件下饱和软黏土蠕变特性试验研究. 工程地质学报, 27(6): 1262-1269. DOI: 10.13544/j.cnki.jeg.2017-625
    引用本文: 倪静, 李杉杉, 韩玉琪, 韦毅. 2019: 加卸荷条件下饱和软黏土蠕变特性试验研究. 工程地质学报, 27(6): 1262-1269. DOI: 10.13544/j.cnki.jeg.2017-625
    NI Jing, LI Shanshan, HAN Yuqi, WEI Yi. 2019: EXPERIMENTAL STUDY ON CREEP BEHAVIOR OF SATURATED SOFT CLAYS UNDER LOADING AND UNLOADING CONDITIONS. JOURNAL OF ENGINEERING GEOLOGY, 27(6): 1262-1269. DOI: 10.13544/j.cnki.jeg.2017-625
    Citation: NI Jing, LI Shanshan, HAN Yuqi, WEI Yi. 2019: EXPERIMENTAL STUDY ON CREEP BEHAVIOR OF SATURATED SOFT CLAYS UNDER LOADING AND UNLOADING CONDITIONS. JOURNAL OF ENGINEERING GEOLOGY, 27(6): 1262-1269. DOI: 10.13544/j.cnki.jeg.2017-625

    加卸荷条件下饱和软黏土蠕变特性试验研究

    EXPERIMENTAL STUDY ON CREEP BEHAVIOR OF SATURATED SOFT CLAYS UNDER LOADING AND UNLOADING CONDITIONS

    • 摘要: 为了研究上海软黏土的蠕变力学特性,开展了排水和不排水条件下上海软黏土的三轴蠕变力学试验,分析了不同围压水平、加卸荷水平对饱和软黏土蠕变特性的影响,得到了不同试验条件下上海软黏土蠕变的力学特性。试验结果表明:围压水平及加卸荷水平对软黏土蠕变变形有一定影响;土体蠕变变形特性与排水条件密切相关,排水条件下,固结效应削弱了土体蠕变现象;同等条件加载过程中不排水条件下土体变形量大,卸载后不排水条件下土体回弹较明显;不排水蠕变试验加载过程中,孔隙水压力随时间发展的变化规律与土体蠕变变形规律相似;排水蠕变试验加载过程中,固结变形和蠕变变形同时存在,排水量曲线在卸载后没有出现明显下降。

       

      Abstract: Creep test was conducted on Shanghai soft clays under both drained and undrained conditions by means of triaxial creep apparatus. The creep properties of Shanghai soft clays can be influenced by factors including confining pressures,loading and unloading stress ratios,which is analyzed accordingly. Experimental results show that the confining pressures,loading and unloading stress levels can affect the creep deformation of the soft clays. The creep behavior of the soft clays is closely related to the drainage conditions and the consolidation can help to cease the creep phenomenon. The creep and resilience deformations of the soft soils are larger under the undrained condition,compared with those under the drained condition. The history of build-up of pore water pressures is similar to the development of axial strains with time under the undrained condition. Consolidation deformation and creep deformation exist simultaneously in the drained tests,however,the volume of water discharge doesn't drop right after unloading.

       

    /

    返回文章
    返回