Early warning method of coal mining subsidence

Abstract

The invention discloses an early warning method of coal mining subsidence. The method is characterized in that the growth height of a water flowing fracture zone is judged according to the ultimate roof breaking interval of a key stratum and soft rock and the growth condition of the height, which grows along with the increasing of working face advancing distance, of a free space on the lower portion of the key stratum and soft rock, the possibility of the coal mining subsidence is evaluated by the height of the water flowing fracture zone, the height of the water flowing fracture zone continuously grows along with the increasing of the working face advancing distance, and an early warning is given out when the height of the water flowing fracture zone approaches a critical height, and coal mining subsidence will occur if the working face distance further increases, or else a coal mine is safe. The early warning method of coal mining subsidence has the advantages that underground water is prevented from fast seeping into a goaf area or deep rock along mining cracks, underground water level lowering is prevented, downhole water burst or mine flooding is prevented, precious coal resources can be produced to the maximum extent, and coal mining safety is guaranteed effectively.

Description

technical field [0001] The invention relates to the field of early warning of coal mining disasters, in particular to a method for early warning of coal mining subsidence disasters. Background technique [0002] With the progress of underground coal mining, coal mining subsidence can damage the water-resisting layer developed in the overlying rock in the goaf, resulting in changes in the water level and flow direction of the aquifer. When mining fissures penetrate the goaf and the bottom rock of important regional aquifers, groundwater will accelerate along the mining fissures to infiltrate into the goaf or deep rock mass, reducing the groundwater level. Springs dry up, resulting in underground water inrush or well flooding disasters. On the other hand, the runoff and catchment conditions of surface precipitation may have been changed, causing surface water to infiltrate into the ground through cracks, resulting in a decrease in the flow of river systems, and even the pheno...

AI Technical Summary

Problems solved by technology

On the other hand, the runoff and catchment conditions of surface precipitation may have been changed, causing surface water to seep into the ground through cracks, resulting in a decrease in the flow of river systems, and even the phenomenon of cut-off in surface river systems.

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