Mining method for replacement of banded coal under building by waste rock

Abstract

The bone coal displacement strip coal block exploration under an architecture, concentrically sets 3-5 bone coals filling lane at the center of each strip coal block, based on the buried depth, width, laminated rock structure and protective degree required by the architecture build on the surface of each strip coal block, advancing coal mining for the 3-5 bone coals filling lane and then filling bone coals from the interior to the exterior inside the lane that has dug out coals. Ensuring the safety of the architectures, filling the displacement coal with bone coals, it can realize explorationrate no less than 20%, the total recovery rate of the strip mining area no less than 65%; Filling the mine with bone coals dug out can not only eliminates the bone coals on the land, reduces the encroachment of farmland, mitigates air and environmental pollution, gets rid of bone coal landslide or explosion and other hidden accidents that may affects the human life but also using bone coals working as the underground support of the mine and realizing second partial recovery for strip coal blocks under the architectures.

Description

technical field [0001] The invention relates to a gangue replacement mining method, in particular to a gangue replacement mining method for strip mining under buildings to protect coal pillars. Background technique [0002] There is a large backlog of coal resources in my country's "three downs" (under buildings, "under construction" for short, under railways, under water bodies). According to statistics, at present in my country, only the production mines of unified coal mines have "three-down" coal pressing amounted to 13.79 billion tons, of which 9.468 billion tons were under construction, accounting for 69% of the total coal pressing. Due to the deformation of the surface caused by underground mining, the building is subjected to additional forces such as tension, compression and bending. When the deformation caused by these additional forces exceeds the allowable deformation of the building, the building will be damaged to varying degrees. Sometimes it even collapses. ...

AI Technical Summary

Problems solved by technology

At present, strip mining (hereinafter referred to as "strip mining") is generally used in the mining of coal resources under construction in order to protect surface buildings, but its recovery rate is low (generally about 40%), and resources are seriously wasted.

Images