| 液化地基自由场振动台试验的土性参数识别 |
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| 引用本文： | 李培振,崔圣龙,吕西林,赵鹏. 液化地基自由场振动台试验的土性参数识别[J]. 同济大学学报(自然科学版), 2010, 38(6): 791-797. DOI: 10.3969/j.issn.0253-374x.2010.06.003 |
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| 作者姓名： | 李培振 崔圣龙 吕西林 赵鹏 |
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| 作者单位： | 同济大学,土木工程防灾国家重点实验室,上海,200092 |
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| 基金项目： | 国家"九七三"重点基础研究发展计划资助项目，上海市青年科技启明星计划资助项目，国家自然科学基金重点资助项目 |
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| 摘 要： | 基于已进行的液化地基自由场振动台试验,利用参数识别技术对试验记录的土体加速度和孔隙水压力进行分析,研究了场地液化机理及土的动力特性.由自由场振动台试验的土体加速度记录求出土体的动剪切应力—应变曲线,并研究了土体的动剪切模量及阻尼特性随动剪切应变的变化关系.结果表明:利用参数识别技术识别的土的刚度与土动力性质试验获得的数据基本一致,而阻尼要高于土动力性质试验的结果;孔隙水压力增长对土的剪切波速有影响,会引起土的刚度降低.
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| 关 键 词： | 砂土 液化 振动台试验 参数识别 |
| 收稿时间： | 2009-03-30 |
| 修稿时间： | 2010-03-23 |
Parameter Identification of Liquefiable Soil in Free Field Tested on Shaking Table |
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| LI Peizhen,CUI Shenglong,LU Xilin and ZHAO Peng. Parameter Identification of Liquefiable Soil in Free Field Tested on Shaking Table[J]. Journal of Tongji University(Natural Science), 2010, 38(6): 791-797. DOI: 10.3969/j.issn.0253-374x.2010.06.003 |
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| Authors: | LI Peizhen CUI Shenglong LU Xilin ZHAO Peng |
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| Affiliation: | State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China |
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| Abstract: | The characteristics of liquefiable soil during earthquake excitation of free field were identified based on multiple acceleration records in shaking table tests.The time histories of cyclic shear stress and shear strain in the soils were evaluated from the accelerations recorded in the soil.These histories were used to estimate variation of soil dynamic shear moduli and material damping characteristics with shear strain amplitude.Soil stiffness properties agree well with those obtained based on laboratory tests.The material damping computed from acceleration records was however much higher than that independently measured in laboratory tests.Pore pressure buildup was found to affect shear wave velocity in the soil and weaken soil stiffness. |
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| Keywords: | sand soil liquefaction shaking table test identification |
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