Mining coal seam floor damage depth monitoring method

Abstract

The invention relates to the technical field of coal seam floor damage depth monitoring, and provides a mining coal seam floor damage depth monitoring method which comprises the following steps: determining a water guide damage zone according to fracture development conditions and water guide properties before and after coal seam floor recovery, and determining a stress-strain zone according to strain change conditions before and after coal seam floor recovery, determining a physical property difference zone according to the physical property change condition before and after the coal seam floor is stoped; and monitoring the damage depth of the coal seam floor during mining according to the water diversion damage zone, the stress-strain zone and the physical property difference zone. The coal seam floor can be divided into a water guide failure zone, a stress-strain zone and a physical property difference zone through a point-line-plane full-space and multi-parameter cooperative monitoring mode, the influence degree of the coal seam floor during mining can be analyzed, the failure condition of the coal seam floor can be monitored, and the coal seam floor can be protected from being damaged by the water guide failure zone, the stress-strain zone and the physical property difference zone. And scientific risk prediction, safety prediction and water disaster prevention and control schemes can be formulated.

Description

technical field [0001] The invention relates to the technical field of monitoring the damage depth of a coal seam floor, in particular to a method for monitoring the damage depth of a mining coal seam floor. Background technique [0002] With the gradual depletion of shallow coal resources, coal mining is tending to develop in depth. At present, my country's coal mining depth is developing downward at 10-25m / a, and there are 138 production mines with a mining depth of more than 800m in the country. The shallow coal resources in coal-producing areas are almost exhausted, and the deep coal resources above 1000m account for nearly 53% of the total coal resources. Most of the lower formation coal in the North China type coalfield is located directly on the Ordovician limestone aquifer, facing the mining conditions of strong water abundance and high water pressure. The Carboniferous Permian coalfield in Ordos has gradually entered the stage of underpressure mining, and the safe m...

AI Technical Summary

Problems solved by technology

In related technologies, there are many monitoring methods for the damage depth of coal seam floor, such as hydrogeological drilling detection method, drilling segmented water injection test method, strain measurement method, acoustic CT detection method and pit penetration method, etc., but they are limited by site conditions , various monitoring methods have a certain scope of application, and the monitoring content is relatively single, which cannot fully reflect the damage of the floor

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