Method for heightening wet storage Bayer red mud stack yard dam body

Abstract

The invention discloses a method for heightening wet storage Bayer red mud stack yard dam body. The method includes: laying a geotechnical cloth on a surface of red mud in a dam foundation range; laying a horizontal drainage sand layer on the geotechnical cloth; arranging a primary drainage blind ditch on an internal dam toe of a heightened dam in the dam axial direction; arranging secondary drainage blind ditches in the direction perpendicular to the dam axis direction, wherein the secondary drainage blind ditches slope to the primary drainage blind ditches; arranging enrockment seepage wells in the axial direction of the primary drainage blind ditches at intervals, wherein the primary drainage blind ditches slope to the enrockment seepage wells; arranging trans-dam drainage blind ditches between the enrockment seepage wells and dam external water collection pits; arranging vertical plastic drainage plates between the secondary drainage blind ditches, burying top ends of the vertical plastic drainage plates into the horizontal drainage sand layer; and placing, air-drying, and rolling wet red mud in a layering manner to form the heightened dam. The advantages of the method are that the upper heighted dam and a dam foundation drainage system can achieve heightening of the wet storage Bayer red mud stack yard dam body and drainage consolidation of the dam foundation.

Description

technical field [0001] The invention is a method for heightening the dam body of the Bayer method red mud storage yard suitable for wet storage, and can realize the heightening of the dam body and the drainage consolidation of the Bayer method red mud dam foundation at the same time. technical background [0002] As a place to store red mud, the red mud yard is not only an important production facility for alumina enterprises, but also an important source of danger and pollution. Its safety and environmental protection issues have attracted much attention. The main characteristics of the red mud storage yard are the long construction period, large land occupation, and great impact on the surrounding environment and water sources. At present, most of my country adopts the Bayer process to produce alumina. The mechanical indicators (cohesion and internal friction angle) of red mud produced in the production process have great changes with the difference of water content. The h...

AI Technical Summary

Problems solved by technology

For the red mud stockpile that discharges Bayer process red mud by wet method inside a dam, when the dam body is heightened and expanded, the dam foundation of the heightened dam will be located in the wet stockpiled area with very low mechanical strength index On the red mud of the Bayer method, the stability of the heightening dam body is difficult to be guaranteed, which may easily cause safety accidents

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