Horizontal leakage preventing structure for red mud dump in karst terrain

Abstract

The invention discloses a horizontal impervious structure of karst area red mud yard which arranges a drain layer, a main impervious layer, a non-woven cloth, a underlay layer, an air guide layer and a groundsill processing layer from upper to down under the compressed red mud layer at the bottom of said red mud yard. Wherein, the thickness of compressed red mud layer is 800-1200mm; the thickness of drain layer is 300-500mm; the thickness of main impervious layer is 500-1000mm; the thickness of underlay layer is 100-200mm; and the thickness of air guide layer is 400-600mm. The invention can effectively lead groundwater and balance the air pressure generated by the fluctuation of groundwater to avoid the destruction on the main impervious layer and strengthen the safety and stability of said impervious system of karst area red mud yard.

Description

Technical field: [0001] The invention relates to an anti-seepage structure for an alumina red mud storage yard, in particular to a horizontal anti-seepage structure for a red mud storage yard in a karst area. Background technique: [0002] Karst refers to the unique geological landscape formed in areas where soluble rocks (mainly limestone and other carbonate rocks) are distributed, and the rocks have been subjected to geological processes such as dripping, scouring, and dissolution of water for a long time. In order to reduce the alkali pollution to the environment caused by the attached liquid of red mud, dry transportation and dry storage are generally adopted for the disposal of red mud in karst areas. The water-solid ratio of red mud transported by dry method is below 1:1, which is far lower than the index of wet transport (3-5):1, but the water content of red mud sent to the storage yard is still 40-50%, such as anti-seepage Improper system settings may still cause re...

AI Technical Summary

Problems solved by technology

However, in areas with strong karst development, after the anti-seepage structure of the prior art is operated in the storage yard, under the action of gas pressure and erosion force generated by red mud pressure and groundwater level fluctuations, karst is likely to occur at shallow karst development areas Collapse, destroying the integrity of the anti-seepage layer, causing red mud and its attached liquid to enter the karst pipeline, polluting groundwater, causing blockage of karst pipeline, and triggering new karst collapse

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