Goaf coal spontaneous combustion partition isolation prevention method based on coal face advancing degree

Abstract

The invention discloses a goaf coal spontaneous combustion partition isolation prevention method based on the coal face advancing degree. The goaf coal spontaneous combustion partition isolation prevention method comprises the following steps of (1) advancing a coal face forwards through an open-off cut after the coal face is arranged, respectively hanging and fixing flexible formworks on goaf sides on the upper and lower ends of the coal face, and then pouring micro-expansion concrete for filling so as to form a first upper-end isolation wall body and a first lower-end isolation wall body, so that a first isolation wall body is formed, and a first isolation belt is formed; and (2) continuing to advance the coal face forwards, repeatedly hanging and fixing the flexible formworks and filling till an Nth upper-end isolation wall body and an Nth lower-end isolation wall body are formed, so that an Nth isolation wall body is formed, and an Nth isolation belt is formed. According to the goaf coal spontaneous combustion partition isolation prevention method, on the basis of the coal face advancing degree, a plurality of isolation wall bodies are arranged on the goaf sides of the upper and lower ends of the coal face, the whole goaf is divided into a plurality of isolation areas from the open-off cut to a mining stopping line, gas flow in the goaf is reduced, and the reliability of goaf coal spontaneous combustion prevention is increased.

Description

technical field [0001] The invention belongs to the technical field of underground fire prevention and extinguishing in coal mines, and in particular relates to a partition isolation and prevention method for coal spontaneous combustion in a goaf based on the advancement degree of a coal mining face. Background technique [0002] Coal plays an important role in my country's economic development, and coal spontaneous combustion is one of the main disasters that restrict the safe and efficient mining of coal resources. Spontaneous coal combustion requires four conditions: residual coal with a tendency to spontaneous combustion, a good heat storage environment, sufficient oxygen supply conditions, and a certain oxidation time. The air leakage from the working face to the goaf is one of the main sources of oxygen for the oxidation of residual coal in the goaf. Controlling the air leakage from the working face and two lanes to the goaf is one of the difficulties in preventing and...

AI Technical Summary

Problems solved by technology

The above method can reduce the air leakage in the goaf of the working face in the mines that meet the construction conditions, but there are still the following disadvantages in practical application: the two methods of plugging with glue and stacking the isolation belt while mining and stacking need to increase with the working face. Promoting timely operation consumes manpower and material resources and has limited sealing effect; as for the method of adjusting the air volume or the pressure difference inside and outside the goaf, since the air volume rationing of the working face is restricted by various factors, the air volume required for fire prevention is just opposite to the air volume required for gas , by adjusting the air volume and pressure difference to control air leakage, it is necessary to consider factors such as gas, fire prevention and dust exhaust at the same time. It is a relatively complicated technical management work that affects the whole body. effect, may also cause a fire, resulting in serious consequences

[0004] The air leakage in the gob area is only one of the oxygen supply sources for the oxidation of residual coal in the gob area. Using the above method as a daily preventive measure requires labor costs on the one hand Higher, limited effect, on the other hand, there are new security risks

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