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<p>To address the issues caused by karstification of rock masses in Guizhou expressway tunnels, the mechanisms underpinning the evolution of dissolution of gypsum-bearing dolomite were investigated in different ionic environments through simulation. Rock specimens were subjected to a 120-hour dissolution experiment using deionized water, MgSO₄, and CaSO₄ solutions (at concentration gradients of 240/480/720 ppm). Changes in the solution conductivity and the ion concentration were dynamically monitored to analyze the dissolution patterns. Macro and micro-scale tests were conducted to study the changes in the macroscopic morphology and microstructure of gypsum-bearing dolomite. The results indicate that the dissolution of the rock mass exhibits two types of evolution: overall uniform dissolution (forming uniform dissolution joints) and localized dissolution channels along primary joint planes, with the latter developing faster and to a greater extent; the severity of corrosion in different environments is ranked (in a descending order) as follows: MgSO₄ solution, deionized water, then CaSO₄ solution. This shows that the dissolution of gypsum-bearing dolomite is not solely influenced by the common-ion effect but is the result of the combined action of multiple ions, including Mg²⁺, SO₄²⁻, and Ca²⁺. These ions influence the dissolution of gypsum-bearing dolomite through a synergistic mechanism involving the salt effect and common-ion effect. This principle provides a scientific basis for the prevention of karst disasters in a certain highway tunnel in Guizhou Province.</p>

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Characterization of gypsum-bearing dolomite corrosion under the action of different karst solutions

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Yuting Song,
  • Fei Yu,
  • Jian Li,
  • Zhangjun Dai,
  • Shanxiong Chen,
  • Yong Cao

摘要

To address the issues caused by karstification of rock masses in Guizhou expressway tunnels, the mechanisms underpinning the evolution of dissolution of gypsum-bearing dolomite were investigated in different ionic environments through simulation. Rock specimens were subjected to a 120-hour dissolution experiment using deionized water, MgSO₄, and CaSO₄ solutions (at concentration gradients of 240/480/720 ppm). Changes in the solution conductivity and the ion concentration were dynamically monitored to analyze the dissolution patterns. Macro and micro-scale tests were conducted to study the changes in the macroscopic morphology and microstructure of gypsum-bearing dolomite. The results indicate that the dissolution of the rock mass exhibits two types of evolution: overall uniform dissolution (forming uniform dissolution joints) and localized dissolution channels along primary joint planes, with the latter developing faster and to a greater extent; the severity of corrosion in different environments is ranked (in a descending order) as follows: MgSO₄ solution, deionized water, then CaSO₄ solution. This shows that the dissolution of gypsum-bearing dolomite is not solely influenced by the common-ion effect but is the result of the combined action of multiple ions, including Mg²⁺, SO₄²⁻, and Ca²⁺. These ions influence the dissolution of gypsum-bearing dolomite through a synergistic mechanism involving the salt effect and common-ion effect. This principle provides a scientific basis for the prevention of karst disasters in a certain highway tunnel in Guizhou Province.