Building method of novel gob-side packing body

Abstract

The invention provides a building method of a novel gob-side packing body. According to the method, concrete slurry is pumped into a packing bag, then high-water filling material slurry is pumped intothe packing bag, and a gob-side packing body with a concrete condensate on the lower part and a high-water packing material condensate on the upper part is formed. According to the building method ofthe novel gob-side packing body, because the high-water packing material slurry can solidify the water precipitated out of the concrete slurry in the condensation process, it is avoided that the solidification effect of the concrete material on the lower part is influenced, and the phenomenon that a packing body is difficult in roof contact because the volume is reduced is also avoided. Therefore, the packing body can carry out complete roof contact, and in other words, it can be implemented that a gob is closed, and a gob-side entry and the gob are completely isolated. Furthermore, the high-water packing material condensate has the good plastic property and can yield during roof weighting of a packing area, in other words, the packing body is good in plastic property and can carry out active bearing, so that it is avoided that the packing body deforms or even causes damage.

Description

technical field [0001] The invention belongs to the technical field of gob-side entry retaining filling, and in particular relates to a method for constructing a novel entry filling body. Background technique [0002] Gobside retaining is an important technical means of mining without coal pillars. Its principle is to reserve narrow coal pillars or construct artificial walls in the mining roadway of the working face in the upper section for mining in the working face of the lower section. use. In the prior art, the roadway is usually arranged in the stress reduction area of ​​the lateral fixed bearing pressure of the working face, which is beneficial to the maintenance of the roadway, and at the same time can reduce the amount of roadway excavation, improve the tension of excavation replacement, reduce the width of coal pillars, It has the advantages of reducing the loss of coal resources, prolonging the service life of the mine, and improving the efficiency of mine mining....

AI Technical Summary

Problems solved by technology

One of the important ways is to retain the roadway with concrete as the main material and cast-in-place concrete walls along the edge of the goaf to preserve the mining roadway. Because of the wide range of material sources of concrete, this technology of retaining roadway has been gained a certain degree. However, it has the following obvious disadvantages: 1) The concrete slurry is relatively viscous, difficult to pump, and it is difficult to fully connect to the top during the filling process; it is easy to separate water during the solidification process of the concrete slurry, and the volume of the filling body is reduced, and the concrete wall The height is further reduced, and there is generally a gap of 200~300mm from the roof of the goaf, so the isolation between the goaf and the goaf cannot be realized, that is, the airtightness of the goaf cannot be realized

However, if the goaf cannot be sealed, there must be defects of poor fire prevention and extinguishing performance in the goaf, and there will be a risk factor that the gas in the gob will flow into the goaf and cause the gas to exceed the limit; Active support cannot be realized, and the roof of the gob-side roadway has a large deformation and then acts on the concrete wall, which is not conducive to the deformation control of the surrounding rock of the gob-side roadway; 3) Concrete is a rigid material, and under the influence of mining stress, the concrete wall is prone to Irreversible deformation failure; when the direct roof of the coal seam is a weak rock formation, it is easy to produce roof cutting along the edge of the wall in the gob-side roadway, the roof in the gob-side roadway sinks violently, and even a roof fall accident occurs, resulting in the failure of gob-side roadway retention

4) The roadside filling formwork in the gob-side entry retention is all hexahedral, and in the actual production process, there will be uneven stress on the top surface of the filling formwork and uneven sinking of the top surface of the filling formwork

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