Reserved anchor net and right-angled yieldable shed combined support technology for extremely soft coal seam roadway

Abstract

The invention discloses a reserved anchor net and right-angled yieldable shed combined support technology for an extremely soft coal seam roadway. The technology comprises steps as follows: the net section size of the roadway is designed, the reserved section size of the coal seam roadway is determined, and the rectangular roadway in the reserved section size is tunneled in a coal seam along a coal seam roof; basic support is performed on the tunneled coal seam roadway with anchor rods, anchor cables and metal nets, an anchor carrying body is formed around the roadway, and the anchor cables at upper parts of two walls are required to be upwards obliquely anchored into a roof stratum; right-angled yieldable sheds are made of U36 steel, movement deformation of surrounding rock of the roadway is monitored, when the surrounding rock deformation is monitored to reach a design deformation value, the right-angled yieldable sheds are erected, and the right-angled yieldable sheds and anchor rods have same pitch and are arranged at intervals in a staggered manner; the right-angled yieldable sheds are fixed with tie rods, the stress yieldable amount of the right-angled yieldable sheds is realized by the hoop fastening degree and the overlapping space between two sections of U36 steel of yieldable cross beams, left yieldable columns, right yieldable columns and middle yieldable columns, and construction is finished after the sheds are dismounted at intervals and re-erected.

Description

technical field [0001] The invention relates to a large-deformation roadway surrounding rock control technology, which belongs to the field of geotechnical engineering anchoring support, and particularly relates to the ultra-soft coal seam roadway support technology of underground mining engineering. Background technique [0002] Coal seam mining requires tunneling in the coal seam, and the stability of the surrounding rock of the coal seam roadway determines the safe and efficient mining of coal. The existence of the support and the annular U-shaped steel shed support of the broken roof of the roadway makes some extremely soft coal seam roadways have two groups of extremely soft coal bodies moving into the roadway as a whole and the broken roof bends and sinks, which seriously affects the functional requirements of the roadway. Length of service. Therefore, it is particularly important to find a new and reasonable method for surrounding rock control in very soft coal seam ...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems that the anchor net support of the roadway in the extremely soft coal seam and the support of the anchor net combined with the arched shed are easy to cause the overall movement and deformation of the two gangs and the roof is broken and sinking so that it is difficult to achieve the stability of the surrounding rock of the roadway, and proposes a roadway in the extremely soft coal seam The combined support technology of pre-empty anchor mesh right-angle shrinkable shed is aimed at solving the problem of the overall movement and deformation of the two gangs and the large amount of roof breaking and sinking caused by the conventional support method of extremely soft coal seam roadway, so as to reduce the support cost and realize the roadway Surrounding rock stability

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