盐卤腐蚀环境中胶结充填体的强度演化与细观损伤机理
DOI:
作者:
作者单位:

濮阳职业技术学院 能源与化学工程学院

作者简介:

通讯作者:

中图分类号:

TD 528

基金项目:

国家自然科学基金(51709113)


Strength evolution and mesoscopic damage mechanism of cemented backfill under brine corrosion
Author:
Affiliation:

School of Energy and Power Engineering,Shandong University

Fund Project:

  • 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:

    为研究滨海矿区井下人工充填矿柱的盐卤腐蚀机理,并为充填材料耐腐蚀性能的提升提供技术参考,对不同腐蚀时间条件下的材料力学性能和细微观结构进行了研究。通过单轴压缩试验,分析了腐蚀时间对强度性能的影响规律,并利用计算机层析扫描(CT)和显微图像探究了试件在盐卤腐蚀作用下的细观损伤演化规律和微观机理。结果表明:随着腐蚀时间从0d增至360d,胶结充填体的抗压强度和弹性模量逐渐下降,变化速率先慢后快;胶结充填材料内部的细观裂隙随着腐蚀时间的增加逐渐扩张,由CT扫描图像计算的面裂隙率呈指数型增长趋势,表明充填体结构损伤程度不断提高;适当增加充填料浆的质量分数有利于力学性能的增强,但效果在长期腐蚀作用下逐渐减弱;胶结充填体的抗压强度与面裂隙率呈负线性相关关系,说明采用CT扫描对预测充填体在腐蚀过程中的强度折减规律是合理可行的;在盐卤环境的长期作用下,腐蚀性离子的侵入和电化学作用使得水化产物的微观形态发生演变,孔隙逐渐扩张,结构的黏结程度下降,最终导致胶结充填材料力学性能发生弱化。

    Abstract:

    To study the halogen corrosion mechanism of artificially filled pillars in underground mining area and provide technical reference for improving the corrosion resistance of materials, mechanical properties and fine microstructure of materials under different corrosion time conditions were studied. Uniaxial compression test and computer tomography scan test were carried out to obtain the damage law of backfill strength and microstructure, and the microscopic mechanism of halide corrosion was analyzed combined with the microscopic images. The results show that as the corrosion time increases from 0d to 360d, the compressive strength and elastic modulus of the cemented backfill gradually decrease, and the rate of corrosion slows down first and then increases. The meso-crack of the backfill expands gradually with the increase of corrosion time, and the surface crack rate calculated by CT scan images shows an exponential growth trend, indicating that the structural damage degree of the backfill is constantly increasing. Appropriately increasing the mass fraction of filling slurry is beneficial to improve the mechanical properties of materials and reduce the crack rate. The negative linear correlation between the compressive strength and the surface crack rate obtained from the test indicates that it is reasonable and feasible to use CT image to predict the strength reduction law of cemented backfill in the process of halogen corrosion. Through the morphological analysis of microstructure, it is found that the invasion of corrosive halide ions and chemical action reduce the bonding degree of cemented body, which is the fundamental principle leading to the strength weakening of Sanshandao cemented backfill body.

    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:2023-02-21
  • 最后修改日期:2023-03-13
  • 录用日期:2023-03-18
  • 在线发布日期:
  • 出版日期: