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金属矿山 ›› 2016, Vol. 45 ›› Issue (06): 8-13.

• 采矿工程 • 上一篇    下一篇

基于压密和损伤函数复合作用的单轴压缩本构关系

赵永川1,2,杨天鸿1,2,刘洪磊1,2, 汪泓1,2,刘刚3,申志亮3   

  1. 1.深部金属矿山安全开采教育部重点实验室,辽宁 沈阳 110819;2.东北大学资源与土木工程学院,辽宁 沈阳 110819;3.黑龙江省煤矿深部开采地压控制与瓦斯治理重点实验室,黑龙江 哈尔滨 150028
  • 出版日期:2016-06-15 发布日期:2016-08-19
  • 基金资助:

    * 国家重点基础研究发展计划(973计划)项目(编号:2013CB227902),国家自然科学基金项目(编号:51574059,51404067,51574060)。

Constitutive Relation of Uniaxial Compression Based on the Pressure Consolidation and Damage Function

Zhao Yongchuan1,2,Yang Tianhong1,2,Liu Honglei1,2,Wang Hong1,2,Liu Gang3,Shen Zhiliang3   

  1. 1.Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines,Shenyang 110819,China;2.School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;3.Key Lab of Heilongjiang Province of Ground Pressure Control and Gas Control of Deep Coal Mines,Harbin150028,China
  • Online:2016-06-15 Published:2016-08-19

摘要: 对西部钙泥质胶结砂岩进行单轴压缩实验。考虑压密阶段和损伤阶段应力应变曲线的变化特点,分别将压密阶段的体积应变和加载过程中的声发射累计数作为表征压密状态和损伤状态的参量,进行归一化后分别用于描述压密和损伤特征,并选取Logistic函数和指数函数进行回归拟合得到加载过程中的压密函数和损伤函数。结合试件的弹性变形特点,对压密函数和损伤函数进行线性组合,分别对由载荷控制和位移控制(包括峰前和全过程)的单轴压缩实验得到的应力应变曲线进行回归分析,得到了砂岩在单轴压缩条件下与实验结果相关性较高的的本构方程,并分析了压密函数和损伤函数中参数的物理意义。

关键词: 单轴压缩, 声发射, 压密, 损伤, 本构方程

Abstract: The uniaxial experiments of western cemented slime sandstone were conducted.Based on the stress-strain variation at pressure consolidation and the damage stage in the constitutive curve,the volumetric strain in the pressure consolidation stage and the acoustic emission in the loading process were considered as the parameters to describe the pressure consolidation and damage characteristic.The Logistic function and exponential function were used to fit the curve of volumetric strain and accumulative acoustic emission respectively to obtain the pressure consolidation and damage function.Take a consideration of the elastic deformation characteristic of the sample,the Logistic and exponential function were combined in a liner to make regression analysis on the stress-strain curve obtained by the uniaxial compression tests of loading control and displacement control (including the before-peak and the whole process).Then,the well-fitting constitutive equation of sandstone under uniaxial compression was established and the meaning of parameters in the pressure consolidation function and damage function were analyzed.

Key words: Uniaxial compression, Acoustic emission, Pressure consolidation, Damage, Constitutive function