Effective Model of Flow in Heterogeneous Confined Aquifers
E. D. Khodyrev, V. V. Trofimov
Republican Academic R&D Institute of Mining Geology, Geomechanics, Geophysics and Mine Surveying-RANIMI, Donetsk, Russia
Keywords: Flow, fluid, piezometric wave, fracturing, porosity, permeability, rocks, stress-strain behavior, failures, confined aquifer, failure criterion
Abstract
The fluid transport analysis in fractured porous rocks requires investigating flow in large fractures and inside porous blocks. This is possible with the flow model with the hereditary-type sources, which allows adding the flow analysis with the pressure difference of fluid in blocks and fractures, which is called a piezometric wave. Its influence on the change in the stress-strain behavior of structural elements in a seam (matrix) is investigated. The theoretical studies validate the possibility of the seam matrix transition to pre- and post-limiting deformation. It is shown that zones of probable pressure-induced disintegration in rocks adjoin the highly permeable zones of seams. Origination of such zones greatly reduces permeability of confined aquifers and efficiency of drainage well. The necessary conditions for these processes to develop and their prevention activities are set forth.
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