Method for heaping up waterproof tailing pond dam body at one time using tailing coarse sand together with geomembrane

Abstract

The invention discloses a method for heaping up a waterproof tailing pond dam body at one time using tailing coarse sand together with geomembrane. The method includes the steps that (1) beneficiation tailing sand is classified through a cyclone, the settling sand is further classified through a high frequency linear vibrating screen, the coarse sand with containing water being about 15%-18% is obtained, it is guaranteed that the coarse sand with the grain size being more than 0.2 mm can be over 50%, and the material uniformity deviation factor K is equal to 40%-60%; (2) grinding damming is conducted on the obtained coarse sand on a treated dam base, it can be guaranteed that the inner and outer slope ratio is 1:2 to 1:3, the dry bulk density is 1.6-1.8 t / m<3>, and the permeability coefficient is 1.3*10-4-1.5*10-4 cm / s; (3) the inner slope of the heaped dam body is covered with a waterproof geomembrane layer; (4) the outer slope of the heaped dam body is protected by plain concrete precast blocks. The water content, mean grain size and evenness of the coarse sand after being screened can all meet requirements, the stability of the dam body is guaranteed, and one-time heaping shaping can be achieved.

Description

technical field [0001] The invention relates to a tailings dam building method, in particular to a method for one-time stacking of an impermeable tailings reservoir dam body by using tailings coarse sand combined with a geomembrane. Background technique [0002] The technology of sending the tailings discharged from the concentrator to a designated place for stockpiling or utilization is called tailings treatment. The structure system built for tailings stockpiling is generally referred to as tailings pond for short, including reservoir area, tailings dam, flood discharge structures and dam observation equipment, etc., to store the tailings discharged from the concentrator. [0003] The tailings dam is an important production facility and environmental protection facility of the mine - the core enclosure structure of the tailings pond. It is a special geotechnical engineering, usually consisting of an initial dam built with soil and stone materials and a later stage of taili...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing tailings dam building method is cumbersome to operate, has a long construction period, cannot be completed at one time, and has low work efficiency, and the stability of the dam body cannot be guaranteed and cannot be waterproofed. Provides a method for one-time construction of an impermeable tailings reservoir dam with tailings coarse sand combined with geomembrane