邓肯E-B模型参数敏感性分析
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摘要
对于覆盖层和大粒径坝料,单纯依靠室内试验难以准确测定其模型参数,近年来联合室内和现场试验反演分析确定本构模型参数的方法日益受到重视。但待反演参数过多时反演结果可能会出现多值问题,因此需要合理选择待反演参数。本文研究了土石坝应力变形计算中位移对邓肯E-B模型参数的敏感性,讨论了影响分析结果的因素,给出了邓肯E-B模型参数的敏感性排序。研究结果可作为选择待反演参数的依据,同时也可为土石坝应力变形分析结果的综合评价提供支持。
For alluvial materials and dam materials of large particle size,the constitutive model parameters cannot be determined accurately only by laboratory tests.Thus,the back analysis method based on both lab oratory and field tests has received increasing attention in recent years.In back analysis,it is necessary to properly choose the parameters needing to be back analyzed to ensure the result’s uniqueness.The purpose of this paper is to determine the sensitive parameters of Duncan E-B model and discuss factors affecting the sensitivity analysis.The result can be used as the basis of inversion parameters selection,and also can provide a support for the comprehensive evaluation for the stress and deformation analysis of earth and rock fill dams.
For alluvial materials and dam materials of large particle size,the constitutive model parameters cannot be determined accurately only by laboratory tests.Thus,the back analysis method based on both lab oratory and field tests has received increasing attention in recent years.In back analysis,it is necessary to properly choose the parameters needing to be back analyzed to ensure the result’s uniqueness.The purpose of this paper is to determine the sensitive parameters of Duncan E-B model and discuss factors affecting the sensitivity analysis.The result can be used as the basis of inversion parameters selection,and also can provide a support for the comprehensive evaluation for the stress and deformation analysis of earth and rock fill dams.
引文
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[7]尹蓉蓉,朱合华.邓肯模型参数敏感性分析[J].华东船舶工业学院学报(自然科学版),2003,17(1):19-23.
[8]刘小生,刘启旺,杨玉生.联合室内和现场试验综合确定土体本构模型参数的方法研究[R].北京:中国水利水电科学研究院,2009.
[2]何昌荣,杨桂芳.邓肯模型参数变化对计算结果的影响[J].岩土工程学报,2002,24(2):170-174.
[3]恩戈科.堆石坝材料参数的灵敏度分析[J].河海大学学报,1999,27(5):94-99.
[4]牟声远,王正中.堆石料邓肯模型的参数敏感性与统计分析[J].中国农村水利水电,2009(3):97-100.
[5]李金凤.高面板堆石坝堆石体力学参数反演及变形控制研究[D].南京:河海大学,2008.
[6]吴长彬,燕乔.堆石料的邓肯E-B模型参数敏感性分析[J].水电能源科学,2010,28(8):94-96.
[7]尹蓉蓉,朱合华.邓肯模型参数敏感性分析[J].华东船舶工业学院学报(自然科学版),2003,17(1):19-23.
[8]刘小生,刘启旺,杨玉生.联合室内和现场试验综合确定土体本构模型参数的方法研究[R].北京:中国水利水电科学研究院,2009.
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