Method for determination of anisotropic medium permeability parameters based on single-hole flow wave equation

Abstract

The invention discloses a method for determination of anisotropic medium permeability parameters based on single-hole flow wave equation, comprising the steps of: first, determining the permeability parameter Keij of a single fracture through the single well flow wave equation; second, according to the fractured medium hydrodynamics theory, calculating the equivalent permeability coefficient Kei of same group discontinuities; at last, obtaining the anisotropic medium permeability parameter K based on the rock mass permeability tensor theory. By employing fractured medium hydrodynamics and oscillation test principles in the method, tests and data processing can be quickly finished on spot and the anisotropic medium permeability tensor can be obtained. The method can be used for parameter determination in study of pollutant migration, nuclear waste and carbon dioxide storage and underground heat motion, and also can be used in the field of, such as foundation safety inspection and large volume concrete safety inspection, having a great application and popularization value.

Description

technical field [0001] The invention relates to a method for determining anisotropic medium permeability parameters based on a single-hole water flow wave equation, in particular to a calculation method for anisotropic fractured rock mass permeability coefficient tensor in the field of hydrogeology. Background technique [0002] The anisotropic permeability parameters of rock mass (rock mass permeability coefficient tensor, structural surface equivalent permeability coefficient, structural surface permeability coefficient, etc.) are very important parameters for studying rock mass groundwater movement. It involves engineering fields such as water conservancy and hydropower, mining, nuclear energy, petroleum, coal and transportation, and is related to the safety and stability of foundations, slopes and caverns of major projects. As we all know, the water permeability of rock mass mainly depends on the water permeability of the structural plane of rock mass. How to determine t...

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Problems solved by technology

[0003] The methods for determining the anisotropic permeability parameters of rock mass can be summarized into four categories: the first category is the fracture sample method proposed by Snow (1969), which is based on the cubic law of groundwater movement in a single fracture and considers the rock mass Geometric elements such as the inclination, inclination, gap width, and gap spacing of the structural plane of the middle fracture, and the method for calculating the permeability coefficient tensor of the rock mass; the second category is Papadapulos (1966), Hantush (1966), Way (1982), Neuman (1975 , 1984), Zhou Zhifang (1998) and other pumping test methods successively proposed, based on the principle of analytical solution, the permeability coefficient tensor of rock mass is determined through field pumping test data; the third category is Snow (1966), Rocha (1978), Louis (1970, 1974) and Hsieh (1985) proposed water pressure test methods, including on-site three-stage water pressure test method, on-site cross-hole water pressure test method, etc. The test results of such methods are more objective and credible, and the determined rock The bulk permeability coefficient is relatively accurate, but it is often limited by the field work site, and the actual test costs a lot; the fourth type is the numerical inversion method, which reflects that under the given initial value and boundary value conditions, through the existing The parameters obtained by fitting the measured groundwater dynamic information, this method requires reliable groundwater dynamic data, model rationality and inverse problem solution uniqueness

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