Large-span underground space construction method based on strip mine pit

Abstract

The invention discloses a large-span underground space construction method based on an open pit. A foundation layer, a bottom artificial water-resisting layer, a bottom water guide layer, a rectangular supporting dam, a reinforcing top, an upper artificial water-resisting layer, an upper hydrophobic layer, a normal soil discharging layer, a top artificial water-resisting layer and a top hydrophobic layer are sequentially built in the pit from bottom to top. The method is advantaged in that the strip mine pit is fully utilized for construction, the space utilization rate is increased, space construction and strip mine dumping are conducted synchronously, and the influence on mine production is small; a lot of strip mine stripping materials are adopted, material cost is reduced, and meanwhile the dumping capacity of a dumping site is not affected. Anchor point reinforcement is conducted through the strip mine end slope, the anchor point tensile strength is improved, and construction cost is reduced. After dumping of the dumping site, the waste further applies pressure to the anchor points, and the tensile strength of the anchor points is improved. The rectangular supporting dam strengthens the tensile strength and shear resistance of the steel cables in the vertical direction section by section, and stability of the reinforced top is improved.

Description

technical field [0001] The invention relates to a method for constructing an underground space, in particular to a method for constructing a large-span underground space based on an open pit. Background technique [0002] ‌Open-pit mining will form huge deep pits, which will have a great impact on the ecological environment and geological stability of the mining area. At present, some explorations have been made on the treatment of abandoned mine pits in China. The public schemes include building the mine pits into geological parks, or building buildings in the mine pits, and internal drainage and backfilling are generally used for horizontal or near-level open-pit mines. Way to fill mine pits. In fact, pit backfilling is the best way for the regional ecological environment, which can simultaneously achieve environmental protection and regional geological safety. On the one hand, the cost of backfilling the mine pit is huge, and directly backfilling the huge space that has...

AI Technical Summary

Problems solved by technology

On the one hand, the cost of backfilling the mine pit is huge, and directly backfilling the huge space that has been excavated is a great waste of space resources

On the other hand, based on safety considerations, more and more important facilities are now placed in the underground space. The excavation cost of the underground space is high and the process is complicated.

Images