东北大学学报（自然科学版）

东北大学学报:自然科学版 ›› 2017, Vol. 38 ›› Issue (3): 418-423.DOI: 10.12068/j.issn.1005-3026.2017.03.024

• 资源与土木工程 • 上一篇    下一篇

基于扰动理论的沈阳中粗砂本构模型

陈晨1， 赵文1， 刘博2， 贾鹏蛟1   

  1. (1. 东北大学 资源与土木工程学院， 辽宁 沈阳110819; 2. 中国建筑东北设计研究院有限公司， 辽宁 沈阳110003)
  • 收稿日期:2015-10-14 修回日期:2015-10-14 出版日期:2017-03-15 发布日期:2017-03-24
  • 通讯作者: 陈晨
  • 作者简介:陈晨(1981-)，男，辽宁沈阳人，东北大学博士研究生; 赵文(1962-)，男，内蒙古集宁人，东北大学教授，博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(51204029)； 中建股份科技研发项目(CSCEC-2014-Z-35).

Constitutive Model of Shenyang Medium-Coarse Sand Based on Disturbance Theory

CHEN Chen1， ZHAO Wen1， LIU Bo2， JIA Peng-jiao1   

  1. 1. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China; 2. China Northeast Architectural Design & Research Institute Co.， Ltd.， Shenyang 110003， China.
  • Received:2015-10-14 Revised:2015-10-14 Online:2017-03-15 Published:2017-03-24
  • Contact: JIA Peng-jiao
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摘要： 针对沈阳地区中粗砂在不同围压下的三轴固结排水剪切试验，发现中粗砂的相对密实度对其强度和变形特性有重要影响.以相对密实度为自变量，提出了统一扰动度函数.基于试验数据，建立了统一扰动度与初始模量和峰值强度的函数关系，提出考虑扰动的D-C模型.将其预测结果与D-C模型预测结果及试验结果进行对比:D-C模型的预测值在D○D接近0时与试验结果比较一致；土体受到正扰动时，D-C模型预测的应力值较该修正模型偏大；而土体受到负扰动时，其预测的应力值又相对偏小，因此考虑扰动的D-C模型能更好地模拟沈阳地区中粗砂的强度及变形特性.

关键词: 沈阳中粗砂, 三轴固结排水剪切试验, 相对密实度, 统一扰动函数, 修正邓肯-张模型

Abstract: The results of triaxial consolidation drained shear tests on medium-coarse sand in Shenyang region under different confining pressures show that the relative density strongly affects the strength-deformation property of medium-coarse sand.Taking the relative density as independent variables， the general disturbance function was put forward. Then the modified D-C model， which could reflect the disturbance’s influence on the strength-deformation property of medium-coarse sand， was developed by establishing the relationship between parameters K and peak strength and disturbed degree. The contrasts of the forecast results between the modified D-C model and D-C model are as follow: the forecast results of D-C model and experimental results are consistent when D○D is close to zero; the stress value predicted by D-C model is larger than the modified model in this paper when sand is positive disturbance; the stress value predicted by D-C model is smaller than the correction model when sand is negative disturbance. It is found that the modified D-C model can describe the strength-deformation property of medium-coarse sand better than D-C model at the disturbed state.

Key words: Shenyang medium-coarse sand, triaxial consolidation drained shear tests;relative density, general disturbance function, modified D-C model

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