| Bouc-Wen土体动力模型的阈值应变研究 |
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| 引用本文： | 鲁丽雪,迟世春.Bouc-Wen土体动力模型的阈值应变研究[J].岩土力学,2014,35(5):1311-1316. |
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| 作者姓名： | 鲁丽雪 迟世春 |
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| 作者单位： | 大连理工大学 海岸与近海工程国家重点实验室，辽宁 大连 116024 |
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| 基金项目： | 国家自然科学基金（No. 50879007）；国家自然科学基金（No. 50979014）。 |
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| 摘 要： | 探讨Bouc-Wen土体动力模型的适用条件与参数对滞回圈的影响等。基于热力学基本定律，研究了Bouc-Wen土体动力模型的增量耗散函数表达式，讨论了不同动应变水平下某筑坝土石料的能量耗散机制。发现筑坝土石料的动力特性存在2个阈值应变，即第l和第2阈值应变。其对应的模量比分别为0.94左右及0.50～0.80之间。第2阈值应变与传统意义上以孔压升高或体积变化为标准的门槛应变相当。对进一步认识土体动应力-应变特性有一定意义。
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| 关 键 词： | 土体动力本构模型 筑坝土石料 阈值应变 变形机制 |
| 收稿时间： | 2013-01-09 |
Threshold strain study of dynamic Bouc-Wen model for soils |
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| LU Li-xue,CHI Shi-chun.Threshold strain study of dynamic Bouc-Wen model for soils[J].Rock and Soil Mechanics,2014,35(5):1311-1316. |
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| Authors: | LU Li-xue CHI Shi-chun |
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| Institution: | State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian, Liaoning 116085, China |
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| Abstract: | The applicable conditions of dynamic Bouc-Wen model and influence of the model parameters on hysteretic loop, etc. are discussed. Based on the laws of thermodynamics, the incremental dissipation functional expressions of Bouc-Wen dynamic model are formulated. Then the energy dissipation mechanism of damming earth and rocks are analyzed under different levels of dynamic strain; and two threshold strains are found defined as the first threshold strain and the second threshold strain respectively. The corresponding modulus ratios are around 0.94 and between 0.50-0.80. The second threshold strain is equated with the traditional threshold strain using pore water pressure build-up or volume changes as standard. It is good for the further understanding of the dynamic response of soil. |
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| Keywords: | dynamic constitutive model for soils damming earth and rocks threshold strain deformation mechanism |
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