A Method for Determining Section Size of Thin Coal Seam Semi-coal and Rock Roadway

Abstract

The invention relates to a method for determining the section size of a half coal rock roadway in a thin coal seam, and belongs to a thin coal seam roadway section size determination method. The method comprises the steps of firstly preliminarily determining an appropriate section size of the half coal rock roadway; secondly, optimizing the section size of the roadway according to a principle of first height then width, that is, reducing the height of the roadway at first so as to determine the minimum height of the roadway, and widening the roadway so as to determine an optimal roadway width to height ratio; checking whether the reduced roadway height meets a pedestrian height requirement or not, and determining the minimum height of the roadway; and checking whether the widened roadway meets limit span and mine safety ventilation requirements or not, determining the optimal width to height ratio of the roadway, and acquiring the reasonable width of the roadway. The method provided by the invention combines various geological conditions of the thin coal seam, realizes the value engineering of exchanging rock for coal of the thin coal seam, reduces the tunneling working surface cost, reducing the percentage of shale content, improving the coal quality, and increasing single inlet and per unit yield under the condition of slightly breaking or not breaking rock.

Description

technical field [0001] The invention relates to a method for determining the cross-section size of a roadway in a thin coal seam, in particular to a method for determining the cross-section size of a roadway in a thin coal seam and half coal rock. Background technique [0002] At present, the phenomenon of "ultra-high design and ultra-high excavation" of mining roadways is common in thin coal seam mining in China. During the excavation operation, due to the generally high roadways, the mining problem of breaking the top (bottom) is prominent, the amount of rock excavation is large, and the excavation replacement is tense. . The section design of the roadway basically follows the roadway design of medium-thick and thick coal seams. The excavation height of the mining roadway is mostly above 2.4m. Contents of the invention [0003] The purpose of the present invention is to provide a method for determining the reasonable cross-sectional size of the thin coal seam semi-coal ...

AI Technical Summary

Problems solved by technology

The roadway section design basically follows the design of medium-thick and thick coal seam roadways, and the excavation height of the mining roadways is mostly above 2.4m, the phenomenon of bottom and rock breaking is serious, and the mining efficiency of thin coal seams is poor

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