理论与试验研究

水化学作用下红砂岩长期力学特性的试验研究

  • 刘桃根 ,
  • 李玲 ,
  • 王伟
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  • 1.南昌工程学院 土木与建筑工程学院,南昌 33099;
    2.河海大学 岩土力学与堤坝工程教育部重点实验室,南京 210098
刘桃根(1986—),男,江西新余人,博士,讲师,主要从事岩土工程领域的科研与教学工作。E-mail: qwas6248178@126.com
王伟(1978—),男,安徽合肥人,博士,教授、博士生导师,主要从事岩石力学方面的科研与教学工作。E-mail:wwang@hhu.edu.cn

收稿日期: 2025-01-19

  网络出版日期: 2025-10-17

基金资助

江西省青年科学基金(20202BAB214028);江西省教育厅科技项目(GJJ190979);江西省教育厅科技项目(GJJ211937)

Experimental Study on Long-Term Mechanical Properties of Red Sandstone under Hydrochemical Effect

  • Liu Taogen ,
  • Li Ling ,
  • Wang Wei
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  • 1. School of Civil and Architectural Engineering, Nanchang Institute of Technology, Nanchang 330099, P.R. China;
    2. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, P.R. China

Received date: 2025-01-19

  Online published: 2025-10-17

摘要

环境污染加剧了水岩相互作用,改变工程岩体的物理力学性质和微观结构,继而影响岩体工程的长期稳定,而岩石蠕变特性是岩体工程长期稳定分析和评价的重要研究内容。为探讨水岩相互作用下红砂岩蠕变力学行为及水化学腐蚀作用机理,以湖南桃源水电站红砂岩为研究对象,开展了不同离子浓度和pH值盐溶液腐蚀作用后红砂岩的三轴压缩分级蠕变试验。结果表明:红砂岩的水岩化学腐蚀损伤程度与离子浓度和pH值密切相关,酸碱性越强、离子浓度越大,次生孔隙率和体积膨胀变形越大,蠕变变形和瞬时变形也越大。离子浓度越大,pH值越小,长期强度越低。红砂岩蠕变力学行为对水化学溶液的敏感性总体表现为:酸性盐溶液>碱性盐溶液>中性盐溶液>蒸馏水。轴向稳态蠕变应变速率-偏压的曲线呈“S”型曲线特征,其关系可用指数函数描述。基于试验结果,初步探讨红砂岩蠕变力学行为的水化学腐蚀作用机理。

本文引用格式

刘桃根 , 李玲 , 王伟 . 水化学作用下红砂岩长期力学特性的试验研究[J]. 地下空间与工程学报, 2025 , 21(5) : 1594 -1604 . DOI: 10.20174/j.JUSE.2025.05.13

Abstract

Serious environmental pollution exacerbates the extent of water-rock interaction. The physical and mechanical properties as well as microstructure of engineering rock mass are changed due to the water-rock interaction, having a significant effect on the long-term stability of rock engineering. Creep characteristic of rock plays an important role in analyzing and evaluating the long-term stability of rock mass engineering. In order to investigate the creep mechanical behavior and hydrochemical corrosion mechanism of red sandstone under water-rock interaction, the red sandstone from Taoyuan hydropower station in Hunan province was taken as the research object, and then a series of triaxial compression creep tests were performed on the red sandstone after immersing into salt solutions with different ion concentrations and pH values. The results show that: The water-rock chemical corrosion damage of red sandstone is closely correlated to the ion concentration and pH value of salt solution. The stronger the acid-base property and the higher the ion concentration are, the greater the secondary porosity and the bigger the volumetric expansion deformation is. Meanwhile, the creep deformation and instantaneous deformation increase. Nevertheless, the long-term strength shows a decreasing tendency when the ion concentration increases or the pH value decreases. The sensitivity of red sandstone to chemical solution is as follows: acidic salt solution > alkaline salt solution > neutral salt solution > distill water. The curves of axial steady-state creep strain rate versus deviatoric stress all exhibit a “S”-shaped characteristic. The relationship of axial steady-state creep strain rate with deviatoric pressure can be well described by an exponential function. Based on the experimental results, the hydrochemical corrosion mechanism on creep behavior of red sandstone is preliminarily discussed.

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