为了很好地模拟结构性黄土的宏观力学特性,反映结构性对土体应力应变特性的影响,基于综合结构势的思想,定义了黄土的结构性定量化参数。在沈珠江双硬化参数模型的基础上,引入结构性参数,建立了考虑结构性的双硬化参数模型。通过模型预测结果与实测结果的对比,验证了该模型的合理性。通过引入考虑土结构性的综合结构势参数,进一步将黄土对水的敏感性考虑进土体本构关系中,使得结构性黄土试样的宏观应力应变特性得到合理描述。
Abstract
To simulate the macro-mechanical characteristics of structural loess and reflect the stress-strain behavior of structured loess, the structural quantitative parameter of loess is defined based on the idea of comprehensive structural potential. A double hardening model for structured loess is proposed by introducing the structural parameters into the double hardening model developed by professor SHEN Zhujiang for normal consolidation soil. The rationality of this model is verified by comparing the prediction results with the test results. By introducing the comprehensive structural potential parameter into the double hardening model, the sensitivity of loess to water is considered in the structural constitutive model, and hence the macro stress strain behavior could be better described.
关键词
结构性黄土 /
综合结构势 /
应力比结构性参数 /
双硬化模型 /
本构关系
Key words
structured loess /
comprehensive structural potential /
stress ratio structural parameter /
double hardening model /
constitutive relationship
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参考文献
[1] 龚晓南,熊传祥,项可祥,等.粘土结构对其力学性质的影响及形成原因分析[J] .水利学报,2000,(10):43-47.(GONG Xiao-nan, XIONG Chuan-xiang, XIANG Ke-xiang, et al. The Formation of Clay Structure and Its Influence on Mechanical Characteristics of Clay[J] . Journal of Hydraulic Engineering, 2000,(10):43-47.(in Chinese)
[2] 胡瑞林.粘性土微结构定量模型及其它工程地质特征研究[M] .北京:北京地质出版社,1995.(HU Rui-lin. Research on Quantitative Microstructure Models of Natural Clayed Soils and Its Engineering Geology Characteristics[M] . Beijing: Beijing Geological Publishing House, 1995.(in Chinese)
[3] 谢定义,姚仰平,党发宁.高等土力学[M] .北京:高等教育出版社,2008.(XIE Ding-yi, YAO Yang-ping, DANG Fa-ning. Advanced Soil Mechanics[M] . Beijing: Higher Education Press, 2008.(in Chinese)
[4] BAUDET B, STALLEBRASS S. A Constitutive Model for Structured Clays[J] . Geotechnique, 2004, 54(4): 269-278.
[5] BURLAND J B. 30th Rankine Lecture: On the Compressibility and Shear Strength of Natural Clays[J] . Geotechnique, 1990, 40(3):327-378.
基金
国家自然科学基金项目(50779054,10872161);毕节学院自然科学基金(200903)
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