软粘土流变微结构突变模型与试验研究-工程力学.PDFVIP

29 卷 8 期 Vol.29 No.8 工 程 力 学 2012 年 8 月 Aug. 20 12 ENGINEERING MECHANICS 202 文章编号：1000-4750(2012)08-0202-06 软粘土流变微结构突变模型与试验研究 1 1 2 谢新宇 马伯宁 刘开富 (1. 浙江大学软弱土与环境土工教育部重点实验室，浙江，杭州 310027；2. 浙江理工大学建筑工程学院，浙江，杭州 310008) 摘 要：软粘土的力学特性是粘土颗粒在荷载下的微观力学行为的宏观表现，对于软粘土微观方面的研究是了解 其宏观性质的基础。该文通过唯象理论的方法建立的软粘土微结构突变模型与本构关系，能够描述软粘土流变固 结的力学特性。通过一维流变固结试验对理论进行了验证，试验曲线可以用软粘土的微观特性加以解释。利用最 小二乘法对模型中的参数进行了拟合，拟合曲线与试验值的符合程度较好，拟合参数的变化特点同样能体现出软 粘土微观结构的力学特性。 关键词：软粘土；流变固结；微结构模型；流变试验；微观特性 中图分类号：TU16 文献标志码：A doi: 10.6052/j.issn.1000-4750.2010.11.0841 MICROSTRUCTURAL CATASTROPHHE MODEL AND RHEOLOGICAL CONSOLIDATION TESTS FOR SOFT CLAY 1 1 2 XIE Xin-yu , MA Bo-ning , LIU Kai-fu (1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, Zhej iang 310027, China; 2. Department of Civil Engineering and Architecture, Zhejiang Sci -Tech University, Hangzhou, Zhejiang 310008, China) Abstract: A brief review of the former studies on the mechanisms of soil rheology and microstructure is presented initially. Then a microstructural catastrophic model for soft clay is presented, adopting phenomenological methods, which could be applied to describe the rheological consolidation behaviour of the soft clay. A series of rheological consolidation experiments with different loading rates is performed to testify the theory presented. The creep deformation, which is loading rate dependent, can be clearly observed in these tests. The mechanical behavior of the soil can be understood according to the characteristics of the micr