基于综合结构势的结构性黄土双硬化参数模型

摘要

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.%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.