A coal pillar reinforcement system for gob-side driving and its application method

Abstract

The invention discloses a coal pillar reinforcement system for gob-side entry driving and a use method thereof and belongs to the technical field of coal mine gob-side entry driving supports. The system comprises coal pillar reinforcement anchor cables, grouting drill holes, a grouting monitoring device and a grouting machine, wherein the coal pillar reinforcement anchor cables include anchoring segments, free segments and block gangue devices; each anchoring segment includes an airbag, a front fixing ring, a rear fixing ring and a grouting hole, wherein the front fixing ring and the rear fixing ring are used for fixing the airbag, the front fixing ring is located at the front end of the airbag, the rear fixing ring is located at the rear end of the airbag, and the grouting hole is formedin the rear fixing ring; each free segment includes a steel strand, a tray, a lock and an inner grouting pipe, one end of each inner grouting pipe is connected with the corresponding grouting hole, the other end of each inner grouting pipe is connected with the grouting monitoring device, each airbag is arranged in the length direction of the corresponding steel strand, and the outer circumferenceface of each steel strand is coated with the corresponding airbag. According to the system, coal pillar reinforcement in gob-side entry driving in one direction can be carried out, and the stabilityand bearing capacity of coal pillars are improved.

Description

technical field [0001] The invention belongs to the technical field of gob-side roadway support in coal mines, and in particular relates to a goaf-side roadway coal pillar reinforcement system and an application method thereof. Background technique [0002] With the improvement of the mechanization of coal mine mining, the increase of mine output and mining depth, the requirements for coal recovery rate and mining roadway support technology are getting higher and higher. The method can no longer meet the requirements. Gob-side entry with narrow coal pillars is one of the effective methods to increase coal recovery rate. Gob-side entry is a roadway that is excavated along the edge of the goaf after the mining influence caused by the mining of the upper section working face is stabilized. Due to the high coal recovery rate and easy maintenance of the roadway, the gob-side tunneling technology has been gradually popularized and applied in many mining areas in my country in re...

AI Technical Summary

Problems solved by technology

[0003] In the existing technology, a series of technical improvements have been made for the reinforcement of gob-side roadway coal pillars. Using the anchor cable cross-penetration reinforcement technology can exert a large anchoring force on the coal pillar, improve the support strength of the coal pillar, and ensure the long-term stability of the coal pillar. However, this method needs to be carried out on the coal pillar in advance after the mining of the upper section is completed. Drilling holes, installing preset anchor cables, the process is cumbersome, and the width of the roadway coal pillar is not accurate, and the large error will lead to the impossibility of cross-penetration reinforcement; (2) CN201710035988.9 discloses a gob-side roadway coal pillar The two-way reinforcement method uses the expansion-locking cross-piercing anchor cable to realize the two-way reinforcement of the reserved coal pillar, and the construction can be completed on one side of the reserved coal pillar, which can enhance the bearing capacity and stability of the roadway coal pillar, but In this method, the design of the expansion-lock cross-piercing anchor cable is relatively complicated, and it is impossible to know the pressure in the expansion bag during grouting in real time, and the expansion bag is easily crushed by the gangue in the goaf before grouting, making grouting difficult , resulting in the impossibility of two-way reinforcement of the coal pillar. In addition, when the coal pillar is broken, this method can only reinforce the two sides of the coal pillar, and cannot achieve internal reinforcement of the coal pillar, which greatly reduces the stability and bearing capacity of the coal pillar.

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