| 粗粒土的一种应变硬化模型 |
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| 引用本文： | 徐明,宋二祥.粗粒土的一种应变硬化模型[J].岩土力学,2010,31(9):2967-2972. |
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| 作者姓名： | 徐明 宋二祥 |
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| 作者单位： | 1. 清华大学 土木工程系，北京 100084；2. 清华大学 土木工程安全与耐久教育部重点实验室，北京 100084 |
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| 基金项目： | 国家高技术研究发展计划(863计划)资助项目 |
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| 摘 要： | 堆石料等粗粒土在经受剪切时不仅其强度和刚度随应力水平而变化，其体积变化特征也和应力水平密切相关。在Mohr-Coulomb模型的基础上，提出一个针对这类粗粒土剪切特征的应变硬化模型。模型以Mohr-Coulomb准则作为屈服准则，但考虑土体强度、刚度和体积变化特征均随应力水平而变化等重要特性。对Rowe剪胀理论的推导及其试验基础进行了深入讨论，指出该理论对于粗粒土的局限性，并在此基础上针对粗粒土的剪胀特性进一步发展给出其机动剪胀角的变化规律。与试验结果的计算对比表明，该模型能较为全面地反映粗粒土的主要剪切特性，特别是剪切时的体积变化特性，且相对简便实用。
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| 关 键 词： | 粗粒土 应变硬化 剪胀 剪切特性 |
| 收稿时间： | 2009-05-14 |
A strain hardening model for rockfills |
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| XU Ming,SONG Er-xiang.A strain hardening model for rockfills[J].Rock and Soil Mechanics,2010,31(9):2967-2972. |
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| Authors: | XU Ming SONG Er-xiang |
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| Institution: | 1. Department of Civil Engineering, Tsinghua University, Beijing 100084, China; 2. Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Beijing 100084, China |
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| Abstract: | Abstract: Not only the strength and stiffness varies with stress level, the volumetric change of rockfills under shearing also depends on the confining pressures. A strain hardening model based on Mohr-Coulomb model is proposed for simulation of the shearing characteristics of rockfills. This model utilizes Mohr-Coulomb yield criterion with full consideration of the stress-dependence of stiffness, shearing strength and dilatancy. The theoretical development and experimental base of Rowe’s dilatancy theory is assessed in details, with its limitation for rockfills highlighted. Modification is then made to derive the mobilized dilatancy angle of rockfills. Compared with large triaxial testing results, it has been demonstrated that this new model is capable of simulating the shearing characterizations of granular soils, specially the volumetric changes, despite of its simplicity. |
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| Keywords: | rockfill strain hardening dilatancy shearing characteristics |
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