受酸腐蚀砂岩的细观损伤特性分析
DOI:
作者:
作者单位:

西安建筑科技大学

作者简介:

通讯作者:

中图分类号:

基金项目:

中国博士后科学基金资助项目(2020M673525);国家自然科学基金项目(41172237);中铁二十局集团有限公司2020年度科技研发项目(YF2000SD01A);


Analysis of mesoscopic damage characteristics of acid-corroded sandstone
Author:
Affiliation:

1.Xi ''an University of Architecture and Technology;2.Xian University of Architecture and Technology

Fund Project:

Project funded by China Postdoctoral Science Foundation(2020M673525);National Natural Science Foundation of China (41172237); Science and Technology R&d Project of China Railway 20th Bureau Group Co., LTD in 2020 (YF2000SD01A)

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    为了研究受酸腐蚀砂岩的微细观结构与宏观力学参数之间的相关性,基于物性试验及单轴力学试验,对不同pH值盐酸腐蚀不同阶段砂岩的质量和力学参数进行实时监测,借助于电镜图像处理技术,得到腐蚀砂岩孔隙结构特征参数,计算其孔隙分形维数,基于引申的Lemaitre应变等效原理,建立了基于孔隙率的化学损伤变量,推导出了砂岩的本构模型。结果表明:pH=1、pH=3的盐酸和pH=7的蒸馏水浸泡180d砂岩的质量分别损失1.22%,1.08%、0.57%,单轴抗压强度分别降低了52.93%,41.93%、27.11%,具有明显的时间效应;受酸腐蚀砂岩平均孔径随着腐蚀时间逐渐增加,孔隙分形维数整体呈增加趋势,砂岩的宏观力学参数劣化程度与砂岩质量损失率、微观孔隙率具有相关性,通过强度计算与试验结果对比分析,对该模型合理性进行了验证。

    Abstract:

    To study the relationship between the microstructure and the macroscopic mechanical parameters of the acid-corroded sandstone, the mass and mechanical parameters of sandstone corroded by hydrochloric acid were monitored based on the physical property test and the uniaxial mechanical test. The characteristic parameters and the fractal dimension of the pore structure were obtained with SEM-EDS. The chemical damage variable based on porosity was established and the constitutive model of the corroded sandstone was derived based on the extended Lemaitre strain equivalence principle. The results show that the mass loss of sandstone immersed in hydrochloric acid at pH = 1, 3 and distilled water with pH = 7 for 180 days increased by 1.22%, 1.08%, and 0.57%, respectively. The uniaxial compressive strength decreased by 51.93%, 41.91%, and 27.11%, respectively. It has obvious time effect. The average pore size and the fractal dimension of pores of the acid corroded sandstone increase with increasing the corrosion time; The macroscopic mechanical parameter deterioration degree of sandstone is correlated with the mass loss rate and the microscopic porosity of sandstone The rationality of the model is verified by calculation and test results.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2020-07-27
  • 最后修改日期:2020-10-12
  • 录用日期:2020-10-18
  • 在线发布日期:
  • 出版日期: