An advanced UH model for unsaturated soils

An advanced UH model for unsaturated soils
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非饱和土的高级 UH 模型

DOI:
10.1007/s11440-019-00882-y
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发表时间:
2020-01
期刊:
影响因子:
5.7
通讯作者:
An-Nan Zhou
An-Nan Zhou
中科院分区:
工程技术2区
文献类型:
--
作者:
Ting Luo;Dong Chen;Yang-Ping Yao;An-Nan Zhou

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本文在非饱和土的各向同性正压方程中引入了吸应力,从低应力水平到高应力水平描述了非饱和土的压缩特性。推导了一种新的荷载-湿陷屈服方程,并通过引入UH参数建立了超固结非饱和土模型。该模型仅需9个参数,即可描述正常固结和超固结条件下非饱和土应力应变特性,包括各向同性压缩特性、剪切收缩和膨胀特性、应变硬化和软化特性、湿陷特性、应力路径和临界状态的影响。通过模型预测与试验结果的比较,验证了该模型对超固结非饱和土力学行为的模拟能力。
In this paper, suction stress is introduced into the isotropic normal compression equation of unsaturated soils, which can describe the compression behaviors of unsaturated soils from low to high stress levels. A new loading-collapse yield equation is derived, and a model for over-consolidated unsaturated soils is established via introducing UH parameter. With only nine parameters, the proposed model can describe the stress–strain behavior of unsaturated soils under normally consolidated and over-consolidated conditions, including isotropic compression characteristics, shear contraction and dilatation, strain hardening and softening, wetting–collapse, influence of stress path and critical state. The comparisons between model predictions and tests results are employed to validate the capability of the proposed model regarding reproducing the mechanical behaviors of over-consolidated unsaturated soils.
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