| 不饱和土动弹塑性本构模型研究 |
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| 引用本文： | 汪俊敏,熊勇林,杨骐莱,桑琴扬,黄强.不饱和土动弹塑性本构模型研究[J].岩土力学,2019,40(6):2323-2331. |
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| 作者姓名： | 汪俊敏 熊勇林 杨骐莱 桑琴扬 黄强 |
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| 作者单位： | 宁波大学 岩土工程研究所，浙江 宁波 315211 |
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| 基金项目： | 国家自然科学基金（No.51608385）；宁波市自然科学基金：（2018A610230） |
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| 摘 要： | 以饱和度与有效应力为状态变量，通过引入描述不饱和与饱和土孔隙比差的状态变量，将Zhang等提出的饱和土体应力诱导各向异性动弹塑性本构模型推广到不饱和土体中，使其可描述不饱和土在动力循环荷载作用下的力学特性行为。通过对已有不饱和土体在完全不排水条件下的动三轴试验进行理论模拟，验证了所提出不饱和土本构模型的正确性。最后基于所提出本构模型，讨论了在不排水条件下初始饱和度对不饱和土动力特性研究。结果表明，不饱和土在动力荷载作用下，土体的孔隙比将减少，导致饱和度增加；当初始饱和度较高时，不饱和土会转化为饱和土，从而发生液化现象。该研究成果对研究不饱和土在地震等动力荷载作用下的力学特性行为具有重要意义。
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| 关 键 词： | 弹塑性 本构模型 不饱和土 液化 |
| 收稿时间： | 2018-09-21 |
Study of the dynamic elastoplastic constitutive model for unsaturated soil |
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| WANG Jun-min,XIONG Yong-lin,YANG Qi-lai,SANG Qin-yang,HUANG Qiang.Study of the dynamic elastoplastic constitutive model for unsaturated soil[J].Rock and Soil Mechanics,2019,40(6):2323-2331. |
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| Authors: | WANG Jun-min XIONG Yong-lin YANG Qi-lai SANG Qin-yang HUANG Qiang |
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| Institution: | Institute of Geotechnical Engineering, Ningbo University, Ningbo, Zhejiang 315211, China |
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| Abstract: | The anisotropic elastoplastic constitutive model of saturated soil is extended to describe the mechanical properties of the unsaturated soil by using the degree of saturation and effective stress as the state variables. Through the theoretical simulation of the existing dynamic triaxial tests of the unsaturated soils under completely undrained conditions, the correctness of the proposed constitutive model of unsaturated soils is verified. Finally, based on the proposed constitutive model, the influence of initial saturation on the dynamic mechanical behavior of unsaturated soil is discussed under the undrained condition. The results show that the void ratio of unsaturated soil will reduce under the dynamic loading, which will result in the increase of saturation. When the initial saturation is high, the unsaturated soil will be converted to saturated soil, and the liquefaction will happen. The research results obtained in this paper are of great significance to study the mechanical behavior of unsaturated soils under dynamic loads such as earthquakes. |
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| Keywords: | elastoplasticity constitutive model unsaturated soil liquefaction |
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