| 湿载耦合条件下结构性黄土的压缩变形模式研究 |
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| 引用本文： | 陈存礼,曹程明,王晋婷,褚峰.湿载耦合条件下结构性黄土的压缩变形模式研究[J].岩土力学,2010,31(1):39-45. |
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| 作者姓名： | 陈存礼 曹程明 王晋婷 褚峰 |
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| 作者单位： | 西安理工大学,岩土工程研究所,西安,710048 |
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| 摘 要： | 对不同含水率的杨凌、青海结构性黄土进行压缩试验,依据变形等效原则,用同一固结孔隙比下非饱和黄土与相同干密度饱和黄土的应力之差定义了结构流体等效应力,提出了压缩应力条件下结构性黄土的有效应力原理。探讨了结构流体等效应力与饱和度(含水率)及应力之间的关系,发现含水率较低时黄土的结构流体等效应力与应力之间呈线性关系,并基于此结构流体等效应力,提出了湿载耦合时结构流体等效应力的表达式。依据压缩应力条件下结构性黄土的有效应力原理,引入能够反映结构性变化的结构流体等效应力,在饱和黄土压缩曲线的基础上建立了结构性黄土压缩曲线模式,根据此模式可以确定湿载耦合时的总应力压缩曲线和有效应力压缩曲线,计算结果与试验结果吻合较好,为计算其增湿湿陷变形提供了一条新的途径。
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| 关 键 词： | 结构性黄土 压缩试验 结构流体等效应力 有效应力 湿载耦合 |
| 收稿时间： | 2009-08-18 |
Modeling compression of structural loess under coupling of stress and moisture |
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| CHEN Cun-li,CAO Cheng-ming,WANG Jin-ting,CHU Feng.Modeling compression of structural loess under coupling of stress and moisture[J].Rock and Soil Mechanics,2010,31(1):39-45. |
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| Authors: | CHEN Cun-li CAO Cheng-ming WANG Jin-ting CHU Feng |
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| Institution: | Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an 710048, China |
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| Abstract: | The compression tests are conducted on Yangling and Qinghai structural loesses under different water contents. Based on the principle of equivalent deformation, the equivalent stress of structure fluid is defined by using compression stress difference between unsaturated and saturated loesses under the same consolidation void ratio . The effective stress principle of unsaturated structural loess is established under compression stress. Relations between equivalent stress of structure fluid and degree of saturation as well as stress are investigated. The relation between equivalent stress of structure fluid and stress is linear as the water content is lower. Based on the equivalent stress of structure fluid under lower water content, the formula of equivalent stress of structure fluid is proposed which can reflect coupling of stress and moisture. According to effective stress principle of unsaturated structural loess under compression stress and introducing equivalent stress of structure fluid reflecting the structure change, the formula of compression of structural loess is established. The compression curves of total stress and that of effective stress can be calculated under the coupling of stress and moisture by the formula. The calculating results are accord with the test results, so as to offer a new approach to evaluating unsaturated collapsibility. |
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| Keywords: | structural loess compression tests equivalent stress of structure fluid coupling of moisture and stress effective stress |
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