A steel pile method for controlling floor heave of gob-side entry retaining

Abstract

The invention belongs to the field of mine, and relates to a method for controlling floor heave of a gob-side entry retaining. To solve the problem of difficulty of controlling the floor heave, two paralleling baseplate drill holes are drilled at two base angles, which are 15-25 meters at the rear of a recovering coalface, of the gob-side entry retaining; two waste steel rails are respectively mounted in the two drill holes as steel piles of a baseplate, the gaps between the steel piles and drill hole walls are stuffed by floating recrement, and wooden wedges are used for wedging the gaps between exposed parts of the steel piles and two sides. With the advance of the coal face, construction is carried out row by row according to row distance until the construction of the whole gob-side entry retaining is completed. With consideration of bending resistance and shearing resistance of the steel piles and mechanical mechanism of the steel piles controlling rock mass deformation of the baseplate, the method is better in controlling the floor heave of the gob-side entry retaining. The steel pile method is simple and convenient to operate, and is low in cost with the waste steel rails as materials.

Description

technical field [0001] The invention relates to a method for controlling the bottom drum of a mine roadway, in particular to a control method suitable for the bottom drum of a gob-side entry retention. Background technique [0002] Under the development direction of green mining and scientific mining in the mining industry, gob-side entry retaining technology has been widely used in many mines at home and abroad, constantly reflecting the advantages of this technology in terms of roadway forming speed, coal recovery rate and gas control. . However, the project site shows that the gobside retaining technology is not perfect, and there are still many problems in its application, among which the floor drum problem is particularly serious. In some roadways, the maximum floor drum volume is nearly 1000mm, and the maximum floor drum speed reaches 95mm / d. After going undercover, the kick drum continued to develop. In deep well mining, the problem of floor heave in gob-side retain...

AI Technical Summary

Problems solved by technology

Although these methods can play a certain role in controlling the bottom slab of gob-side entry retaining in a poor stress environment, their control ability is limited, and the construction procedures are complicated and the cost is high, so they are generally not used in gob-side entry retaining engineering sites

However, the undercover method commonly used in engineering sites is neither economical nor fundamentally solves the problem of floor drum control in gob-side entry retention

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