High mining height workface stepped coal cutting process

Abstract

Provided is a large mining height fully-mechanized step type coal cutting process. In a fully mechanized working face, a coal mining machine cuts the coal on the coal wall along the coal seam thickness direction to form a step on the coal wall, and then cutting coal for the step at lower part of the coal wall, and the processes are performed circularly in order; or the front and the rear rollers of the coal mining machines are adopted to directly perform upper and lower cutting to keep the cut coal wall having one step all the time; when the height of the coal wall of the coal mining working face is changed, the upper and lower height of the step of the coal wall is adjusted to make the height of the coal seam above the step always lower than the height of the coal seam under the step so as to the optimal stress state of the coal wall area, and to essentially improve the stability of the coal rock of the working face. The process not only can effectively control the large area rib spalling or end surface roof caving caused by long time stay of the large mining high coal wall, but also can work as an operation platform for outburst prevention circulation measure construction for the coal and gas projecting under the coal seam. The process is simple, convenient in construction, easy in operation, and has wide practicability.

Description

technical field [0001] The invention relates to a large mining height fully mechanized coal cutting process, in particular to a large mining height fully mechanized coal cutting process. Background technique [0002] The safe and efficient mining of coal resources is the direction of the development of the world's coal industry. In the past ten years, with the continuous development of science and technology, the level of technical equipment and production management of coal mining in my country has been continuously improved, and the key technologies in coal production have been greatly improved, making the safe and efficient production of coal continuously Leaping to a new level, the iconic mining technology is the fully mechanized top-coal caving technology. After more than 20 years of continuous development and improvement in my country, this technology has solved the problem of safe and efficient mining of thick and extra-thick coal seams. However, due to the complexit...

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Problems solved by technology

At present, my country has achieved success in large mining height and full thickness under the condition of relatively hard and hard coal seams. However, when the coal cutting height is large and the coal seam is soft, the coal wall of the working face is prone to produce slabs, which will cause work problems. The face end roof collapsed, resulting in casualties and failure of normal implementation of mining technology

Under the condition of soft coal or three-soft (roof, coal seam, floor) coal seam, it is difficult to effectively solve the surrounding rock control problems such as coal wall side and end face roof fall, so that no breakthrough has been made in the safe and efficient mining under this condition. , so it becomes the key and difficult problem in the research and solution of coal production

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