Fully mechanized coal mining face excessive fall fault novel method

Abstract

The invention provides a fully mechanized coal mining face excessive fall fault novel method, which comprises the following steps of digging an exploratory roadway vertical to the fault trend in a haulage gate along a coal seam floor in advance; building a fault trend calculation model according to fault disclose information in the exploratory roadway; designing the blasting roadway trend along the fault trend; designing the blasting roadway cross section dimension and arrangement position according to the operation track of a coal cutting machine and a support frame; forming pre-fracturing deep holes at intervals in the blasting roadway; forming a groove pulling shallow hole in the middle of each pre-fracturing deep hole; installing a lug type chamber in a key position of the blasting roadway; forming fan-shaped drill holes in the chamber. During the blasting construction, the fan-shaped drill holes in the lug type chamber firstly detonate; then, the pre-fracturing deep holes in the blasting roadway detonate; the groove pulling shallow holes detonate at last. Before the blasting construction, a single body hydraulic support post is arranged in the blasting roadway according to requirements. The deep hole pre-fracturing blasting technology is used for pre-processing the fault zone rock; a coal mining machine can be effectively helped to pass through the fault; high yield and high efficiency of the coal mining face can be ensured.

Description

technical field [0001] The invention relates to a method for crossing a fault in a coal mining face, in particular to a new method for a fault with a large drop in a fully mechanized mining face. Background technique [0002] As a common geological structure in the coal mining process, faults seriously restrict the high-yield and high-efficiency working face due to their structural characteristics, mechanical properties and other factors, especially the large-drop faults. At present, the faults with excessive drop in the mechanized coal mining face mainly include the moving and jumping method and the jacking and bottoming method. The method of moving and jumping usually requires another cut to cross the fault, and a large amount of roadway excavation and maintenance costs are invested, and the process of stopping mining at the working face is complicated and the construction speed is slow; The method of shallow hole blasting achieves the purpose of lifting the roof or the b...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a new method for faulting with excessively large drop in fully mechanized mining working face, especially a new method for pre-excavating and pre-splitting deep hole pre-split blasting for fault with excessively large drop in fully mechanized mining face, which can effectively solve the problem of faulting with excessively large drop in working face

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