Experimental study of mechanical characteristics of sandy slate under chemical corrosion

WANG Wei; LI Xue-hao; ZHU Qi-zhi; SHI Chong; XU Wei-ya

doi:10.16285/j.rsm.2017.09.012

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Experimental study of mechanical characteristics of sandy slate under chemical corrosion

更新时间：2026-06-25

- Experimental study of mechanical characteristics of sandy slate under chemical corrosion
- Vol. 38, Issue 9, Pages: 2559-2566(2017)
- 作者机构：
  
  1. 河海大学岩土力学与堤坝工程教育部重点实验室,江苏,南京,210098
  2. 河海大学江苏省岩土工程技术工程研究中心,江苏,南京,210098
  3. 山西省交通规划勘察设计院,山西,太原,030012
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2017.09.012
  CLC： TU411
- Online First：05 June 2018，
  
  Published：2017
- 稿件说明：
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WANG Wei, LI Xue-hao, ZHU Qi-zhi, et al. Experimental study of mechanical characteristics of sandy slate under chemical corrosion[J]. 2017, 38(9): 2559-2566.
DOI：

WANG Wei, LI Xue-hao, ZHU Qi-zhi, et al. Experimental study of mechanical characteristics of sandy slate under chemical corrosion[J]. 2017, 38(9): 2559-2566. DOI： 10.16285/j.rsm.2017.09.012.

摘要

考虑酸性化学溶液和浸泡时间的影响，对砂板岩进行了不同水化学溶液侵蚀作用下的单轴压缩试验。研究了不同水化学环境侵蚀作用对砂板岩试样的相对质量、变形和强度特性的影响规律。监测浸泡过程中溶液的pH值和Ca2+、Mg2+浓度变化。结合扫描电镜试验，探讨了水化学作用下砂板岩的腐蚀机制。结果表明：随着溶液酸性的增强，砂板岩受腐蚀程度逐渐增大；砂板岩的变形特性在水化学作用下表现为受腐蚀软化，并且随着溶液酸性的增强和浸泡时间的延长越发明显；砂板岩的峰值强度在水化学作用下降低，并且浸泡时间越长，强度下降越大；不同水化学环境中水-岩化学作用的类型和程度不同，从而导致岩石微细观结构变化也不相同，中性溶液以岩石内部胶结物质流失为主，酸性溶液中大粒径的矿物集合体也会发生大量溶蚀。

Abstract

This study is to investigate the influence of different chemical solutions and soak time on the mechanical characteristics of sandy slate. Uniaxial compression tests on sandy slate samples are conducted to determine the variations of relative mass

deformation and strength characteristics of sandy slate under different water chemical corrosion conditions. The changes of pH

Ca2+ and Mg2+ concentration of chemical solution are monitored in soaking process. The corrosion mechanism of sandy slate sample soaked by chemical solutions is discussed based on the results of SEM. The results indicate that: with the augmentation of the solution acidity

the corrosion degree of sandy slate increases gradually; sandy slate presents strain softening subjected to chemical solutions

and the softening effect is more evident with the increase of the solution acidity and soak time; the peak strength of sandy slate declines as soaking time extends; the different types and degrees of water-rock interaction lead to different changes in microstructure of sandy slate

presenting loss of cementing material in neutral solution or dissolution of large numbers of mineral particles with large size in acidic solution.

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