Method for determining setting size of coal columns in fully mechanized caving coal mine gob-side entrydriving

Abstract

The invention discloses a method for determining the setting size of coal columns in fully mechanized caving coal mine gob-side entrydriving. Means such as indoor test, theoretical calculation, numerical simulation and field test are adopted; a strong constraining and reinforcing scheme for coal columns of 'anchor pole + metal mesh + concrete injection+ reinforcement of coal columns with hollow grouting anchor cable' is provided; the reasonable setting width of coal columns is determined and the long-term stability of coal columns and mining roadways is guaranteed. By means of the method, on one hand, the tunnel later maintenance engineering work load and the maintenance cost are greatly reduced, and on the other hand, the safe and efficient recovery of the working faces is guaranteed. Therefore, the provided method for determining setting size of coal columns in fully mechanized caving coal mine gob-side entrydriving is of great theoretical significance and has engineering practice value.

Description

technical field [0001] The invention relates to the field of coal mining, in particular to a method for determining the size of coal pillars in fully mechanized gob-side driving. Background technique [0002] At present, most coal mines in my country still use the method of leaving protective coal pillars. To ensure safe mining and minimize the loss of coal resources, it is necessary to set up reasonable protective coal pillars. A large number of studies have proved that for fully mechanized caving gob-side entry, the size of small coal pillars largely determines the stability of this type of roadway, and many roadways have collapse and serious deformation due to unreasonable coal pillar size. And affect safe production. If the width is too large, the coal pillar will be in the area affected by the lateral support pressure for a long time, which is not conducive to the stability of the coal pillar; if the width is too small, the goaf cannot be effectively sealed. A reasona...

AI Technical Summary

Problems solved by technology

[0004] Existing coal pillar setting methods and technologies exist: the research results of the surrounding rock stability control and evaluation system of mining coal roadways mainly rely on the summary of field practice and experience; relevant control and evaluation theories, evaluation factors and indicators, evaluation methods and applications There is no systematic understanding of a series of issues such as models, evaluations, and support countermeasures; there is a large blindness in the practice process; the method of setting coal pillars and the stability control and evaluation of the surrounding rock of the mining roadway lack scientificity and practicality and other defects

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