杨爱武, 孔令伟. 2014: 吹填软土蠕变过程中结构强度变化及微观机理分析. 工程地质学报, 22(2): 181-187.
    引用本文: 杨爱武, 孔令伟. 2014: 吹填软土蠕变过程中结构强度变化及微观机理分析. 工程地质学报, 22(2): 181-187.
    YANG Aiwu, KONG Lingwei. 2014: STRENGTH EVOLUTION AND MICRO-STRUCTURE MECHANICS OF STRUCTURED SOFT DREDGER FILL FROM TRIAXIAL CREEP TEST. JOURNAL OF ENGINEERING GEOLOGY, 22(2): 181-187.
    Citation: YANG Aiwu, KONG Lingwei. 2014: STRENGTH EVOLUTION AND MICRO-STRUCTURE MECHANICS OF STRUCTURED SOFT DREDGER FILL FROM TRIAXIAL CREEP TEST. JOURNAL OF ENGINEERING GEOLOGY, 22(2): 181-187.

    吹填软土蠕变过程中结构强度变化及微观机理分析

    STRENGTH EVOLUTION AND MICRO-STRUCTURE MECHANICS OF STRUCTURED SOFT DREDGER FILL FROM TRIAXIAL CREEP TEST

    • 摘要: 结构性土长期变形过程必然对土结构产生影响。通过对结构性吹填软土进行三轴蠕变试验,在蠕变过程中选取有代表性时间点的样品,对其进行微观结构分析与结构强度测试。研究结果表明,蠕变过程其实就是土体内部结构硬化和软化相互转化的过程。当应力水平低于结构屈服应力时,土体的蠕变是硬化占主要部分,其微观结构的变化是逐渐趋于稳定,结构强度相应增长。当应力水平超过结构屈服应力时,土体的蠕变是软化占主要部分。该阶段可细分为两个阶段,即其结构从大量破坏阶段到土体结构最终破坏阶段;微结构却从稳定阶段变为不稳定阶段,最后又回到无序阶段。

       

      Abstract: The long-term deformation of structural soils inevitably affects soil structure. Through triaxial creep test for structural soft dredger fill, the micro-mechanics and the changes of structure strength were studied by choosing representative sample during the creep. The results show that the essence of creep is the process about mutual transformation between hardening and softening of the internal structure of soil. When the stress level is less than the structure yield stress, the hardening accounts for the main portion in the process of creep, and the change of micro-structure is gradually stabilized, the structure strength increases accordingly. The softening accounts for the main portion in the process of creep when the stress level exceeds the structure yield stress. This stage can be subdivided into two stages. They are the heavy soil structure destruction stage and the soil ultimate failure stage. The micro-structure is changed from the stable stage to the unstable stage, eventually back to the disorder stage.

       

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