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研究软土加速蠕变过程中的微观结构变化可深入了解加速蠕变特性的内在机制。在对天津滨海地区软土进行多种条件下的三轴蠕变试验的基础上,利用微观定量化技术,对比静、动荷载蠕变条件下土样的微观结构,从微观角度对加速蠕变机制进行了解释。研究表明,土样产生加速蠕变后,结构单元体的丰度和复杂度降低;结构单元体形状趋向扁圆形,边缘趋于圆滑;土体颗粒在自然状态下无明显定向性,加速蠕变后其定向性显著增强。振动荷载使得蠕变程度增大,也使得土体蠕变的速率加快。研究结果揭示了土体的加速蠕变实际上是在动荷载作用下土体的内部结构不断自我调整再造的过程。
The study of microstructural changes in soft soil acceleration creep process provides an insight into the intrinsic mechanism of accelerated creep behavior. Based on the triaxial creep test of soft soil in Tianjin coastal area under various conditions, the microscopic quantitative technology was used to compare the microstructure of soil samples under static and dynamic load creep conditions. From the microscopic point of view, Mechanism is explained. The results show that after accelerated creep, the abundance and complexity of structural units decrease; the shape of structural unit tends to be oblate and the edge tends to be smooth; the soil particles have no obvious orientation under natural conditions, After changing its directional significantly enhanced. Vibration loads make the degree of creep increase, but also make the soil creep speed. The research results reveal that the accelerated creep of soil is actually the process of self-adjusting and rebuilding the internal structure of soil under the action of dynamic load.