振动荷载作用下软土加速蠕变的微观机制研究

发布时间：2018-06-18 00:50

本文选题：软土 + 加速蠕变　；参考：《岩土力学》2017年02期

【摘要】：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。
[Abstract]:The internal mechanism of accelerated creep behavior can be deeply understood by studying the microstructure change of soft soil during accelerated creep. Based on the triaxial creep tests of soft soil in Tianjin coastal area under various conditions, the microstructure of soil samples under static and dynamic loading creep conditions is compared by using micro-quantitative technique, and the accelerated creep mechanism is explained from the microscopic point of view. The results show that the abundance and complexity of structural unit body decrease after accelerated creep of soil sample, the shape of structural unit body tends to be oblate and the edge tends to be smooth, and the soil particle has no obvious orientation in natural state. After accelerated creep, its directionality is obviously enhanced. Vibration load increases the degree of creep and accelerates the creep rate of soil. The results show that the accelerated creep of soil is actually a process of self-adjustment and reconstruction of the internal structure of soil under dynamic load.
【作者单位】：天津大学土木工程系;天津大学滨海土木工程结构与安全教育部重点实验室;保利(天津)房地产开发有限公司;
【基金】：国家自然科学基金项目(No.51378344) 天津市应用基础与前沿技术研究计划项目(No.14JCYBJC21700) 天津市科技兴海项目(No.KJXH2013-15)~~
【分类号】：TU447

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