Modeling changes in the permeability in a gypsified fractured-porous rock massif

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• 作者：A. L. Lebedev (1)
  A. V. Lekhov (1)
  
• 关键词：gypsum ; dissolution ; mass transport ; dam base ; gypsum leaching zone
• 刊名：Water Resources
• 出版年：2012
• 出版时间：December 2012
• 年：2012
• 卷：39
• 期：7
• 页码：811-820
• 全文大小：317KB
• 参考文献：1. Verigin, N.N. and Sherzhukov, B.S., Diffusion and Mass Exchange during Liquid Flow in Porous Media, in / Razvitie issledovanii po teorii fil’tratsii v SSSR (1917-967) (Progress in the Theory of Fluid Flow in Porous Media in the USSR (1917-967)), Moscow: Nauka, 1969, pp. 237-13.
  2. Dem’yanova, E.A., Gypsum Dissolution and Export by Water Flowing through Dam Basements, / Inzhenernaya Geologiya, 1986, no. 6, pp. 23-3.
  3. Kornev, Yu.P., Kondrat’ev, A.F., and Gavrikov, B.I., Nizhne-Kafirniganskii Hydrosystem, / Gidrotekh. Melior., 1985, no. 7, pp. 11-7.
  4. Lebedev, A.L., Lekhov, A.V., Sokolov, V.N., and Svitoch, N.A., Gypsum Leaching Rate from Sandstone Pore Space, / Geoekologiya, 2003, no. 5, pp. 438-47.
  5. Lebedev, A.L., and Lekhov, A.V., Mass Export from Gypsified Fractured Rock with Groundwater, / Water Resour., 1999, vol. 26, no. 3, pp. 277-85.
  6. Lebedev, A.L. and Lekhov, A.V., Dissolution Kinetics of Natural Gypsum in Water at 5-5°C, / Geokhimiya, 1989, no. 6, pp. 865-74.
  7. Maksimovich, G.A., / Osnovy karstovedeniya (Fundamentals of Karst Science), Perm: Perm. kn. izd., 1963, vol. 1.
  8. Mironenko, V.A. and Rumynin, V.G., / Problemy gidrogeoekologii. Tom 1. Teoreticheskoe izuchenie i modelirovanie geomigratsionnykh protsessov (Problems of Hydroecology. Vol. 1. Theoretical Studying and Modeling Geomigration Processes), Moscow: Izd. MGTU, 1998.
  9. Oradovskaya, A.E., On the Methods of Studying the Water-Tolerance of Semi-Hard Rocks Gypsum-Bearing Rocks, in / Problemy inzhenernoi geologii v stroitel’stve. Mater. soveshch. po inzhenerno-geologicheskim issledovaniyam skal’nykh osnovanii gidrotekhnicheskikh sooruzhenii (Problems of Geoengineering in Construction. Mater. Conf. on Geoeng. Studies of Hard-Rock Basements of Hydraulic Structures), Moscow: Gosstroiizdat, 1961, pp. 182-95.
  10. Pavlovskaya, L.N., and Fomina, N.E., Studying the Effect of the Elements of Subsurface Contour of a Concrete Dam on Counterpressure, / Izv. VNIIG, 1981, vol. 146, pp. 46-0.
  11. Pokrovskii, G.I., Kol’tsov, G.A., Golovko, A.N., and Tregubko, V.P., Safety Assurance of the Dam at the Nizhne-Kafirniganskii Hydrosystem, / Melioratsiya i Vodnoe Khozyaistvo, 1988, no. 9, pp. 14-6.
  12. Romm, E.S., / Fil’tratsionnye svoistva treshchinovatykh gornykh porod (Hydraulic Properties of Fractured Rocks), Moscow: Nedra, 1966.
  13. Sherzhukov, B.S., Malyshev, A.S., and Golovanova, N.K., Forecasting Bed Gypsum Dissolution in the Basements of Hydraulic Structures, in / Metody rascheta protsessov massoperenosa v gidrogeologicheskikh issledovaniyakh (Methods for Calculating Mass Transport Processes in Hydrogeological Studies), Moscow: VNII VODGEO, 1984, pp. 26-8.
  14. James, A.N., and Lupton, A.R., Gypsum and Anhydrite in Foundations of Hydraulic Structures, / Geotechnique, 1978, vol. 28, no. 3, pp. 249-72. ss="external" href="http://dx.doi.org/10.1680/geot.1978.28.3.249">CrossRef
  15. Lebedev, A.L., Gypsum Dissolution and Leaching Processes: The Influence on Permeability and Porosity of Fractured-Porous Rock Massif, / Proc. Int. Symposium. Engineering Geology and the Environment, Athens, Greece, 23-7 June, 1997, Balkema, pp. 823-27.
  16. Romanov, D., Gabrovsek, F., and Dreybrodt, W., Dam Sites in Soluble Rocks: A Model of Increasing Leakage by Dissolutional Widening of Fractures Beneath a Dam, / Engineering Geology, 2003, vol. 70, p. 1735. ss="external" href="http://dx.doi.org/10.1016/S0013-7952(03)00073-5">CrossRef
  
• 作者单位：A. L. Lebedev (1)
  A. V. Lekhov (1)
  
  1. Geological Faculty, Moscow State University, Moscow, 119992, Russia
  
• ISSN：1608-344X

文摘

A method is proposed for evaluating rock hydraulic conductivity (k x;y sub>, LT?) in grid model blocks to be used in finite-difference simulation of mass exchange in gypcified fractured-porous rocks containing groundwater. The values of k x sub> and k y sub> were determined taking into account the dominating form of transport (advection or transverse dispersion), contributing most to gypsum dissolution. The method was used to simulate groundwater flow in a vertical section of gypsified rocks in the base of the dam at the Lower-Kafirniganskii Hydropower System. The changes in rock permeability in the base of the dam were used to evaluate whether there is a need to take seepage-control measures (cement-grout curtain, blanket, and a gypsum fill over the blanket). A leaching zone was found to form near the curtain and blanket during the simulation period (100 years) under background seepage conditions. In this period, the total water flow in the lower pool can increase by no more than 10-5%. Under such conditions, the “seepage-control-measures can enhance the reliability of the dam at the Lower-Kafirniganskii Hydropower System.