Volume 40 Issue 3
Jun.  2026
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Article Navigation >  GEOTECHNICAL ENGINEERING TECHNIQUE  > 2026  >  40(3): 459-467
ZHU Bangyi, LIU Jingfeng, TANG Wengang, HUANG Xianwen. Changes of pore structure and permeability of tuff under erosion by solution with different pH values[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2026, 40(3): 459-467. doi: 10.20265/j.cnki.issn.1007-2993.2024-0592
Citation: ZHU Bangyi, LIU Jingfeng, TANG Wengang, HUANG Xianwen. Changes of pore structure and permeability of tuff under erosion by solution with different pH values[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2026, 40(3): 459-467. doi: 10.20265/j.cnki.issn.1007-2993.2024-0592
shu

Changes of pore structure and permeability of tuff under erosion by solution with different pH values

doi: 10.20265/j.cnki.issn.1007-2993.2024-0592
  • 1.

    Geotechnical Investigation and Design Institute of Jiangsu Province, Zhenjiang 212021, Jiangsu, China

  • 2.

    The Third Geological Brigade of Jiangsu Geological Bureau, Zhenjiang 212021, Jiangsu, China

  • 3.

    School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215000, Jiangsu, China

  • Received Date: 2024-12-18
  • Accepted Date: 2025-06-26
  • Rev Recd Date: 2025-05-31
    • Available Online: 2026-06-08
  • Publish Date: 2026-06-08
    Abstract
  • The deterioration of rock mass performance under aqueous erosion will lead to a series of engineering safety problems. To further explore the pore structure characteristics and permeability changes of tuff samples subjected to solution erosion, nuclear magnetic resonance (NMR) was used to study the pore structure characteristics of tuff samples subjected to solution erosion. Triaxial compression and penetration tests were carried out on specimens under different confining pressures with triaxial test device. The effects of pH value and velocity of solution on the porosity, the proportion of pore size, the fractal dimension of pore size and permeability were analyzed. The results show that: (1) the pore ratio of tuff specimens is mainly small and medium pores. The increase of solution flow rate increases the porosity of tuff specimens, and the diameter and number of internal pores increase, and the increase rate is acidic solution>alkaline solution>neutral solution. (2) The structure complexity of medium and large pores in tuff specimens is higher than that of micro and small pores. The fractal dimension of pores of each aperture increases under solution scouring, and the increase of micro and small pores is higher than that of medium and large pores. (3) The increase of acid, alkaline solution and solution flow rate will cause erosion of tuff, increase the permeability of the specimen, and the existence of confining pressure will reduce the connectivity of the internal pores of the specimen, thus reducing the porosity of the tuff specimen. The research results can provide reference for quantitative evaluation of the properties of tuff under solution erosion.

     

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