东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2018, Vol. 39 ›› Issue (5): 741-745.DOI: 10.12068/j.issn.1005-3026.2018.05.027

• 资源与土木工程 • 上一篇    下一篇

Pastor-Zienkiewicz砂土模型静力参数变形敏感性分析

李纯， 修占国， 王斐笠， 王秋鸿   

  1. (东北大学 资源与土木工程学院， 辽宁 沈阳110819)
  • 收稿日期:2016-12-12 修回日期:2016-12-12 出版日期:2018-05-15 发布日期:2018-05-25
  • 通讯作者: 李纯
  • 作者简介:李纯(1971-)，男，安徽潜山人，东北大学副教授.
  • 基金资助:
    辽宁省自然科学基金资助项目(2013010311).

Sensitivity Analysis of Static Parameters About Deformation in Pastor-Zienkiewicz Sandy Model

LI Chun， XIU Zhan-guo， WANG Fei-li， WANG Qiu-hong   

  1. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China.
  • Received:2016-12-12 Revised:2016-12-12 Online:2018-05-15 Published:2018-05-25
  • Contact: XIU Zhan-guo
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摘要： 基于广义塑性理论，针对Pastor-Zienkiewicz(P-Z)砂土模型静力参数，划分为3个方面8个参数，分别分析了各参数变化时对竖向位移的敏感性.研究表明:模型各参数在-40%~40%变化时，弹性模量E的敏感性最大，竖向位移变化率可达66.05%，其次为内摩擦角φ和泊松比μ，竖向位移变化率在±10%以内.而与塑性模量相关的参数，竖向位移变化率均低于±1%，当缺少实测数据时，可根据土工实验资料取值.研究结论可为P-Z砂土模型在地基变形计算时参数的选取提供依据.

关键词: Pastor-Zienkiewicz本构模型, 模型参数, 竖向位移, 变化率, 砂土

Abstract: Based on the theory of generalized plasticity， for static Pastor-Zienkiewicz(P-Z) model parameters， it can be divided into eight parameters from three aspects. The sensitivity analysis of vertical displacement varying with each parameter was performed. The results showed that elastic modulus E exhibits the largest sensitivity， and the corresponding maximum rate of vertical displacement is 66.05%， when the every parameter is changed between -40%~40%. Followed by the angle of internal friction φ and Poisson’s ratio μ， the rate of vertical displacement was within ±10%. But for the parameters about plastic modulus， the rate of vertical displacement was less than ±1%. When lack of measured data， the values of plastic parameters can come from a great amount of geological data. The conclusions can provide important basis for the selection of P-Z sandy model parameters in the deformation calculation of sub grade.

Key words: Pastor-Zienkiewicz model, model parameters, vertical displacement, rate of change, sand

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