| 地震荷载不规则性对砂土震陷的影响 |
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| 引用本文： | 陈青生,高广运,何俊锋.地震荷载不规则性对砂土震陷的影响[J].岩土力学,2011,32(12):3713-3720. |
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| 作者姓名： | 陈青生 高广运 何俊锋 |
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| 作者单位： | 1.同济大学 地下建筑与工程系，上海 200092；2.同济大学 岩土及地下工程教育部重点实验室，上海 200092 |
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| 基金项目： | 国家自然科学基金项目，上海市重点学科建设项目资助 |
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| 摘 要： | 利用有限元数值方法模拟不同类型砂土在多向地震荷载输入条件下的动单剪试验，采用弹塑性边界面模型，通过室内动单剪试验实测结果确定模型参数，计算分析地震动特性对砂土震陷的影响。研究结果表明：地震波加载次序、不对称性、加载方向、地震波类型、加载维数对砂土变形影响显著。当大的应力脉冲出现时，砂土竖向应变明显增大，其增量的大小受到大波出现的时刻和次序影响明显；在其他条件相同时，地震波不对称性越明显，砂土竖向应变越大；反向加载对砂土具有向下压应力作用，提高竖向应变值，正向加载效应则与此相反；现有的一些规范方法取20周作为转换后的等幅应力波的标准作用次数进行震陷定量计算，其对于振动型和冲击型地震波输入等效性结果差别较大；Tokimatsu 和Seed（1987）震陷分析方法按2倍单向水平地震动引起的砂土震陷简化确定多向地震动引起的砂土震陷，其结果尚待商榷
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| 关 键 词： | 动单剪试验 地震荷载特性 多向地震输入 砂土震陷 弹塑性边界面模型 |
| 收稿时间： | 2010-05-27 |
Effect of irregularity of earthquake loading on seismic compression of sand |
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| CHEN Qing-sheng,GAO Guang-yun,HE Jun-feng.Effect of irregularity of earthquake loading on seismic compression of sand[J].Rock and Soil Mechanics,2011,32(12):3713-3720. |
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| Authors: | CHEN Qing-sheng GAO Guang-yun HE Jun-feng |
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| Institution: | 1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092,China |
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| Abstract: | Dynamic simple shear tests on different types of sands under multidirectional earthquake loading were simulated with finite element method.Reduced order bounding surface model was employed to study the effect of characteristics of earthquake loading on the seismic compression of sands.The parameters of model were determined based on results obtained from laboratory dynamic simple shear tests.The study results show that the characteristics of earthquake loading such as loading sequence,asymmetry,loading dire... |
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| Keywords: | dynamic simple shear tests characteristics of earthquake loading multidirectional earthquake loading seismic compression of sand reduced order bounding surface model |
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