Classified recovery method for resource-exhausted mine block remaining coal pillars

Abstract

A classified recovery method for resource-exhausted mine block remaining coal pillars comprises the steps that the recoverable block remaining coal pillars of a whole mine are refined, and coal-rock-sample physical and mechanical property testing is carried out on a rock-mechanic servo test system; a numerical simulation software is adopted to conduct evaluating on the stability of the recoverable block remaining coal pillars, and classifying is conducted on the stability of the recoverable block remaining coal pillars; a borehole stress meter and a rock stratum detecting and recording instrument are adopted to conduct testing on the stress distribution characteristics in the recoverable block remaining coal pillars and the internal failure characteristics of the recoverable block remaining coal pillars; grouting reinforcement materials are adopted to conduct grouting reinforcement treatment on a site test dilled hole internally; and aiming at the recoverable block remaining coal pillars of different types, methods of small-belt direct tunnel mining partial recovering and small-belt reciprocating type filling mining total recovering are adopted to conduct classified recovering on the recoverable block remaining coal pillars correspondingly. According to the classified recovery method for the resource-exhausted mine block remaining coal pillars, the purposiveness is strong, the safety is high, the pertinence is good, the abandoned coal resources of the mine can be recovered furthest, and good economical efficiency, practicability and generalization performance are achieved.

Description

technical field [0001] The invention belongs to the technical field of underground mining of coal resources, and relates to a method for recovering section left coal pillars, in particular to a method for classified recovery of section left coal pillars suitable for resource-exhausted mines. Background technique [0002] Coal is my country's basic energy and important raw material, accounting for more than 90% of my country's fossil energy resources, and is the most stable, economical, and self-guaranteed energy source. The proportion of coal in primary energy consumption will gradually decrease, but for a long period of time, the status of coal as the main energy source will not change. At present, most of the aging mines in my country are facing the embarrassment of resource depletion, and there is an urgent need for follow-up replacement resources or enterprise transformation. During this period, how to maintain the stable production of the mines, solve the daily problem...

AI Technical Summary

Problems solved by technology

Due to various historical factors such as aging and mine construction for a long time, backward mining technical conditions and predatory mining of surrounding small coal kilns, the recovery rate of coal resources in the mine is very low, resulting in the rapid depletion of conventional recoverable resources in the mine, and a large amount of coal is discarded. High-quality coal resources

[0003] At present, a number of recovery methods for coal pillars left in sections have been formed at home and abroad, but the relevant methods often have a series of shortcomings such as the inability to recover the coal pillar resources left in mines to the greatest extent, and the mechanization of the recovery methods is low; in addition, due to the Both sides of the remaining coal pillars are often goafs, and most of the pressure of the overlying strata will be transmitted to the remaining coal pillars in the section, resulting in an increase in the stress concentration factor of the remaining coal pillars in the section, making the interior of the remaining coal pillars in the section A large number of secondary fractures are produced in the coal body, which will reduce the strength of the coal pillars left in the section; in the process of on-site recovery of the coal pillars left in the section, the sudden instability of the coal pillars often occurs, causing large-scale collapse of the roof, and even endangering to the safety of personnel

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