System and method for achieving natural striding, falling and filling of coal beds, flexible roadway protection and complete gob-side entry retaining

Abstract

The invention provides a system and method for achieving natural striding, falling and filling of coal beds, flexible roadway protection and complete gob-side entry retaining. Gob-side entry retaining is conducted in a primary mining retaining and protecting area, small coal columns are reserved on one side of a goaf to support and block gangues sliding down from the goaf, anchor bolt support is conducted in a roadway, and three types of roadway-side supporting technologies are adopted in a normal recovery period according to the thickness of the coal beds and the lithology of a top plate and a base plate. According to the system and method, influences of coal column concentrated stress are eliminated, the roadway strata behavior appearing degree is greatly lowered, the gob-side entry retaining is guaranteed to meet requirements for safety in production, disaster accidents such as fire disasters and coal and gas outbursts caused by the reserved coal columns are eliminated, the roadway digging rate is lowered, the ton-coal cost is reduced, the working environment is improved, the high yield and the high-efficiency are achieved, the working face is continuously and rapidly pushed forward, and a solid foundation is established for eliminating the short supply of successive excavating. The medium-inclining and sharp-inclining coal bed goaf top plate naturally strides, falls and slides down to conduct filling under the action of the gravity, and the filling cost of the top plate is zero.

Description

Technical field [0001] The present invention belongs to the field of coal mining technology, especially involving a medium -inclined and rapid coal seam naturally spannial filling, flexible lanes, and completely leaving alley. Background technique [0002] Completely along the empty alley can prevent underground disasters caused by coal pillars, greatly increase the recovery rate of coal, reduce the intraudiovisal excavation rate, reduce the cost of tons of coal, extend the service life of the mine, and alleviate the tension and contradictions of mining.my country has vigorously studied and promoted the application of comprehensive mechanized coal mining techniques in the middle and urgent coal seams in China, and completely along the air alley is the basis for giving full play to the continuous advancement of comprehensive mining equipment and high yield and efficient.At present, only the effect of taking the empty lane in the air in the near -level, thin tilt, and medium thick ...

AI Technical Summary

Problems solved by technology

This technical solution has five main disadvantages: Leaving small coal pillars increases the loss of coal resources; small coal pillars are prone to mine dynamic phenomena such as rock bursts and coal and gas outbursts due to high stress, and coal pillars are prone to a large number of pieces. The bottom of the roadway is bulged, and the roadway retention along the goaf cannot meet the safety production requirements, the effect of roadway retention is poor, and the roadway needs to be repaired many times; after fracturing of small coal pillars, fires often occur in easy-to-natural coal seams; frequent excavation of advanced level roads and contact roadways Increased roadway excavation rate and cost per ton of coal, affecting the mining of the working face, and the ventilation, transportation and pedestrians are extremely blocked, which deteriorates the working environment; leaving small coal pillars makes it impossible to adopt comprehensive mechanized coal mining technology, which greatly restricts the inclination during mining , The degree of mechanization of steeply inclined coal seams

There are two main disadvantages in this technical solution: the cost of increasing the ton of coal is about 150 yuan. At present, the net profit per ton of coal is not more than 100 yuan under the condition of medium-inclined and steeply inclined coal seams without artificial filling. It is completely unfeasible; when the goaf is manually filled, the coal mining operation at the working face must be stopped, and the filling time accounts for 1 / 2 to 2 / 3 of the total time, that is, the coal output of the working face is lower than that without this method. Reduced by 1 / 2~2 / 3

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