USE OF MINING WASTE TO PRESERVE FIELD MOISTURE

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Purpose. Justification of the effectiveness of the proposed method of retaining irrigation moisture in arable land due to the formation of filter inclusions. Research methodology. Computer modeling of filtration flows of irrigation water from the surface to the underlying soil layers. Results. In this article, the authors proposed a method to prevent irrigation water loss in agricultural fields by creating grooves on arable land that have a small open surface area. In order to prevent the walls of the groove from collapsing, the possibility of filling their cavity with small solid burnt mining wastes, which have high filtration properties, was considered. At the same time, filling the void of the groove with a mixture made on the basis of burned waste mass with the addition of bottom sediments raised from reservoirs will also act as a means of increasing productivity. The implementation scheme for arranging irrigation ditches filled with burnt rock in the field, as well as the initial and operational conditions , are substantiated. According to the results of computer and mathematical modeling, using the ANSYS WB program, in a non-stationary setting, qualitative indicators of the water distribution mechanism in the experimental soil fragment were obtained. The wave nature of water migration under the influence of gravitational and capillary forces has been established. The studies show that irrigation water is concentrated in the “groove with rock – moistened soil massif” system, which has the shape of an oval with a limited contact plane with the surface. This determines the low intensity of evaporation, and, accordingly, the effectiveness of the proposed method of retaining water in the arable land by adding solid burnt mining waste. Scientific novelty. The use of small solid mining waste to create irrigation ditches on arable land is proposed, and qualitative indicators of the water distribution mechanism in the experimental soil fragment are obtained. Practical significance. The use of small solid mining wastes, which have high filtration properties, to fill the cavity of irrigation ditches on arable land will allow reducing the loss of water to evaporation and improve the physical and mechanical properties of loamy soils. Key words: mining solid waste, irrigation water, ditch, arable land, loamy soil.