DOI QR코드

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Electrochemical modification of the porosity and zeta potential of montmorillonitic soft rock

  • Wang, Dong (Institute of Mining Technology, Taiyuan University of Technology) ;
  • Kang, Tianhe (Institute of Mining Technology, Taiyuan University of Technology) ;
  • Han, Wenmei (Institute of Mining Technology, Taiyuan University of Technology) ;
  • Liu, Zhiping (College of Chemical Engineering and Technology, Taiyuan University of Technology) ;
  • Chai, Zhaoyun (Institute of Mining Technology, Taiyuan University of Technology)
  • 투고 : 2010.04.29
  • 심사 : 2010.09.07
  • 발행 : 2010.09.25

초록

The porosity (including the specific surface area and pore volume-diameter distribution) of montmorillonitic soft rock (MSR) was studied experimentally with an electrochemical treatment, based on which the change in porosity was further analyzed from the perspective of its electrokinetic potential (${\zeta}$ potential) and the isoelectric point of the electric double layer on the surface of the soft rock particles. The variation between the ${\zeta}$ potential and porosity was summarized, and used to demonstrate that the properties of softening, degradation in water, swelling, and disintegration of MSR can be modified by electrochemical treatment. The following conclusions were drawn. The specific surface area and total pore volume decreased, whereas the average pore diameter increased after electrochemical modification. The reduction in the specific surface area indicates a reduction in the dispersibility and swelling-shrinking of the clay minerals. After modification, the ${\zeta}$ potential of the soft rock was positive in the anodic zone, there was no isoelectric point, and the rock had lost its properties of softening, degradation in water, swelling, and disintegration. The ${\zeta}$ potential increased in the intermediate and cathodic zones, the isoelectric point was reduced or unchanged, and the rock properties are reduced. When the ${\zeta}$ potential is increased, the specific surface area and the total pore volume were reduced according to the negative exponent law, and the average pore diameter increased according to the exponent law.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China

참고문헌

  1. Adamson, L.G., Chilingar, C.M. and Beeson, R.A. (1966), "Electrokinetic dewatering, consolidation and stabilization of soils", Eng. Geol., 1, 291-304. https://doi.org/10.1016/0013-7952(66)90011-1
  2. Adamson, L.G., Chilingar, C.M. and Beeson, R.A. (1966), "Electrokinetic dewatering, consolidation and stabilization of soils", Eng. Geol., 1, 291-304. https://doi.org/10.1016/0013-7952(66)90011-1
  3. Aggour, M.A., Tchelepi, H.A. and Al-Yousef, H.Y. (1994), "Effect of electroosmosis on relative permeabilities of sandstones", J. Petrol. Sci. Eng., 11, 91-102. https://doi.org/10.1016/0920-4105(94)90031-0
  4. Baraud, F., Tellier, S. and Astruc, M. (1997), "Ion velocity in soil solution during electrokinetic remediation", Hazard. Mater. J., 56, 315-332. https://doi.org/10.1016/S0304-3894(97)00073-3
  5. Bernabeu, A., Exposito, E., Montiel, V., Ordonez, S. and Aldaz, A. (2001), "A new electrochemical method for consolidation of porous rocks", Electrochem. Commun., 3(3), 122-127. https://doi.org/10.1016/S1388-2481(01)00117-5
  6. Chilingar, G.V., Nassir, E.A. and Stevens, R.G. (1970), "Effect of direct electrical current on permeability of sandstone cores", J. Pet. Technol., 22, 830-836. https://doi.org/10.2118/2332-PA
  7. Delgado, A., Gonz, C.F. and Bruque, J.M. (1986), "On the zeta potential and surface charge density of montmorillonite in aqueous electrolyte solutions", Colloid. Interface. Sci. J, 113, 203-211. https://doi.org/10.1016/0021-9797(86)90220-1
  8. Gray, D.H. (1969), "Electrochemical alteration of clay soils", Clay. Clay. Miner., 17, 309-322. https://doi.org/10.1346/CCMN.1969.0170508
  9. Harton, J.H., Hamid, S., Abi-Chedid, E. and Chilingar, G.V. (1967), "Effects of electrochemical treatment on selected physical properties of a clayey silt", Eng. Geol., 2, 191-196. https://doi.org/10.1016/0013-7952(67)90018-X
  10. Horikawa, Y., Murray, R.S. and Quirk, J.P. (1988), "The effect of electrolyte concentration on the zeta potentials of homoionic montmorillonite and illite", Colloid. Surface., 32, 181-195. https://doi.org/10.1016/0166-6622(88)80015-5
  11. Jayasekera, S. and Hall, S. (2007), "Modification of the properties of salt affected soils using electrochemical treatments", Geotech. Geol. Eng., 25, 1-10. https://doi.org/10.1007/s10706-006-0001-8
  12. Jiang, Y., Yoneda, H. and Tanabashi, Y. (2001), "Theoretical estimation of loosening pressure on tunnels in soft rocks", Tunn. Undergr. Sp. Tech., 16, 99-105. https://doi.org/10.1016/S0886-7798(01)00034-7
  13. Madsen, F.T. and Vonmoos, M. (1989), "The swelling behaviour of clays", Appl. Clay. Sci., 4, 143-156. https://doi.org/10.1016/0169-1317(89)90005-7
  14. Mikhajlovich, P.S. (2001), "Process of electrochemical strengthening of rock", Russia Patent, No.2299294.
  15. Mikhajlovich, P.S. (2006), "Method for electrochemical rock consolidation", Russia Patent, No.2175040.
  16. Onargan, T., Koca, M.Y., Kucuk, K., Deliormanli, A. and Saydam, S. (2004), "Impact of the mechanical characteristics of weak rocks and trona ore beds on the main drift deformation at the beypazari mine", Int. J. Rock. Mech. Min. Sci., 41, 641-654. https://doi.org/10.1016/j.ijrmms.2004.01.006
  17. Sabri, M. (2004), "Electrokinetic behavior of clay surfaces", Interface. Sci. Technol., 1, 57-89. https://doi.org/10.1016/S1573-4285(04)80037-1
  18. Schifano, V.C. (2001), "Electrical treatment of clays", Ph.D. diss., University of Illinois, Illinois, Urbana-Champaign.
  19. Schramm, L.L., Mannhardt, K. and Novosad, J.J. (1991), "Electrokinetic properties of reservoir rock particles", Colloid. Surface., 55, 309-331. https://doi.org/10.1016/0166-6622(91)80102-T
  20. Sondi, I. and Pravdic, V. (1996), "Electrokinetics of natural and mechanically modified ripidolite and beidellite clays", Colloid. Interface. Sci. J., 181, 463-469. https://doi.org/10.1006/jcis.1996.0403
  21. Sondi, I., Biscan, J. and Pravdic, V. (1996), "Electrokinetics of pure clay minerals revisited", Colloid. Interface. Sci. J., 178, 514-522. https://doi.org/10.1006/jcis.1996.0146
  22. Sondi, I., Milat, O. and Pravdic, V. (1997), "Electrokinetic potentials of clay surfaces modified by polymers", Colloid. Interface. Sci. J., 189, 66-73. https://doi.org/10.1006/jcis.1996.4753
  23. Song, H.W. (1998), "Preliminary study on improving properties of soft rock with electrochemcial method", China. University. Min. Technol. J., 27, 239-242.
  24. Su, C.M., Fu, J.T. and Guo, B.Y. (2002), "Research on changing tendency of zeta potential of the clay minerals and drilling fluid", SPE. Drill. C., 19, 1-5.
  25. Tan, L.R. and Kong, L.W. (2006), Special geotechnical engineering geology, Science Press, Beijing.
  26. Titkov, N.I. (1961), Electrochemical induration of weak rocks, Consultants Bureau, New York.
  27. Titkov, N.I., Petrov, V.P. and Neretina, A.I. (1965), Mineral formation and structure in the electrochemical induration of weak rocks, Consultants Bureau, New York.
  28. Tuller, M. (2003), "Hydraulic functions for swelling soils: pore scale considerations", Hydrol. J., 272, 50-71. https://doi.org/10.1016/S0022-1694(02)00254-8
  29. Velde, B. and Meunier, A. (2008), The origin of clay minerals in soils and weathered rocks, Springer, Berlin.
  30. Wang, C., Wang, Y. and Lu, S. (2000), "Deformational behaviour of roadways in soft rocks in underground coal mines and principles for stability control", Int. J. Rock. Mech. Min. Sci., 37, 937-946. https://doi.org/10.1016/S1365-1609(00)00026-5
  31. Wang, T. and Fan, Q. (2000), "Optimization of soft rock engineering with particular reference to coal mining", Int. J. Rock. Mech. Min. Sci., 37, 535-542. https://doi.org/10.1016/S1365-1609(99)00080-5
  32. Zhou, H., Cheng, C.B., Yang, X. and Fen X.T. (2008), "Electrochemical induration of weak rocks", Chinese Patent, No.CN101219612A.

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