A design method for a rotating through-and-withdrawal channel of a working face based on triangular stability

Through the design method of rotary through-retraction channel of the working face based on triangular stability, the safety problems caused by the catastrophic instability of the coal column during coal mining are solved, and normal promotion of the working face and safe and efficient withdrawal of the equipment are achieved.

CN115017574BActive Publication Date: 2025-03-18CHINA UNIV OF MINING & TECH
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Patent Information

Application Number
CN202210535473.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-05-17
Publication Date
2025-03-18
Estimated Expiration
2042-05-17

AI Technical Summary

Technical Problem

During coal mining, the coal column between the working face and the retracement channel is instable, resulting in safety problems such as large-area pressure on the roof plate and working face frames, affecting the mining speed and safe and efficient retracement of the equipment.

Method used

The design method of rotary through-retraction channel of the working face based on triangular stability is adopted. The rock mass parameters are measured through on-site research and laboratory, the coal column mechanical model is established, the stable critical width and inclination adjustment angle are determined, the inclination angle of the scraper conveyor is adjusted, and the oblique triangle area is formed to utilize the stability of the coal column self-stabilizing structure, and the number of brackets penetrated and segmented to press to reduce the risk of instability.

Benefits of technology

It effectively reduces safety issues such as large-area roof pressure and working face pressing frame caused by parallel penetration of the bracket, ensures the normal propulsion speed and mining efficiency of the working face, improves the surrounding rock stress state of the retracement channel, and ensures the safe and efficient retracement of the comprehensive mining equipment.

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Abstract

The present invention provides a design method for a rotary through-withdrawal channel of a working face based on triangular stability, and the specific production geological conditions of the working face are investigated on site, and the core is taken on site and its physical and mechanical parameter characteristics are determined by laboratory standard processing; a mechanical model of a coal pillar is established and a critical width of stability is determined; based on the principle of reducing the support load and artificially controlling the segmented pressure, a reasonable tilt adjustment angle of the rotary through-withdrawal channel of the working face and the number of supports that simultaneously penetrate the working face and the withdrawal channel are determined; the process flow of the rotary through-withdrawal channel of the working face is determined according to the determined critical width of coal pillar stability, the critical tilt adjustment angle and the number of supports that simultaneously penetrate the withdrawal channel of the working face. This method can greatly reduce serious production safety problems such as large-area pressure from the roof and pressure on the working face caused by the parallel penetration of the supports through the withdrawal channel, can greatly improve the stress state of the surrounding rock of the withdrawal channel, can effectively reduce the risk of catastrophic instability of the surrounding rock of the withdrawal channel, and can ensure the safe and efficient withdrawal of the fully mechanized mining equipment.
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