| 含统一屈服面的非饱和黏性土弹塑性本构模型 |
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| 引用本文： | 李涛,史世波.含统一屈服面的非饱和黏性土弹塑性本构模型[J].北京工业大学学报,2011,37(11):1684-1691. |
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| 作者姓名： | 李涛 史世波 |
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| 作者单位： | 北京交通大学土木建筑工程学院,北京,100044;中交第二公路勘察设计研究院有限公司,武汉,430052 |
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| 基金项目： | 国家自然科学基金资助项目(50579002) |
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| 摘 要： | 首先将非饱和土巴塞罗那基本模型(Barcelona basic model,BBM)中的加载湿陷(loading collapse,LC)屈服面和吸力增加(suction increase,SI)屈服面统一为一个光滑的屈服面,然后基于弹塑性理论导出相应的弹塑性本构模型.统一屈服面的优点是可以进行LC屈服和SI屈服二者之间的耦合分析,即能模拟净应力和吸力同时变化的加载路径.此外,由于所建模型的屈服面没有尖点,因而可以简化数值模拟计算.所建模型共有14个参数,其中12个与非饱和土的物理力学性质和塑性屈服特性有关,另外2个与土的塑性硬化特性有关,所有参数都可通过非饱和土室内控制吸力的三轴等压和剪切试验确定.所建模型的模拟结果与本次试验研究及已发表文献中试验数据的对比表明,二者之间有较好的吻合,说明所建模型的合理性及有一定的实用价值.
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| 关 键 词： | 非饱和土 弹塑性理论 本构模型 屈服面 三轴试验 |
Elastoplastic Constitutive Model for Unsaturated Cohesive Soils With a Unified Yield Surface |
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| LI Tao,SHI Shi-bo.Elastoplastic Constitutive Model for Unsaturated Cohesive Soils With a Unified Yield Surface[J].Journal of Beijing Polytechnic University,2011,37(11):1684-1691. |
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| Authors: | LI Tao SHI Shi-bo |
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| Affiliation: | LI Tao1,SHI Shi-bo2(1.School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China,2.CCCC Second Highway Consultants Co.Ltd,Wuhan 430025,China) |
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| Abstract: | The LC(loading-collapse) yield surface and the SI(suction increase) yield surface in the BBM model proposed by Alonso for unsaturated cohesive soils are first unified as a smooth yield surface.An elastoplastic constitutive mode with the unified yield surface is then presented in this investigation.One of advantages using a unified yield surface is that the coupled effects of LC yielding and SI yielding can be simply analyzed,i.e.the stress paths can be simulated when the net stress and the suction change at... |
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| Keywords: | unsaturated soils elastoplastic theory constitutive model yield surface triaxial test |
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