A high-stress roadway composite ring body beam support structure and its construction method

Abstract

The invention discloses a high-stress roadway combined ring body beam support structure and a construction method thereof, which belong to the technical field of roadway construction support. For the support ring body, different levels of pull-out anchors and grouting anchors are relatively evenly placed in the surrounding rock, and a relatively uniform steel wire rope net with steel wire ropes as the ribs is pressed under the pressure plate of each layer of anchors. Through the multi-layered strong concrete shotcrete structure that is highly close to the rock surface, the discrete and fragmented surrounding rocks are evenly cemented by applying stabilized pressure and remaining pressure grouting, so as to realize a supporting ring with relatively uniform and greatly improved overall mechanical properties It avoids the short board effect of the support, improves the overall bearing capacity of the surrounding rock, increases the amount of bolt combination in the surrounding rock unit rock body, changes the strength of the single relying on the rock itself, and improves the supporting ring body. The strength of the surrounding rock, together with the cementation of the surrounding rock mass by grouting, improves the mechanical properties of the surrounding rock.

Description

technical field [0001] The invention relates to the technical field of roadway construction support, in particular to a high-stress roadway composite ring body beam support structure and a construction method thereof. Background technique [0002] With the expansion of the coal mine mining area, the mining depth continues to increase, and the mining conditions become more and more difficult, especially the superimposed pressure brought by the self-expansion of the weak rock and coal body under the mining stress, which has been brought about by the large buried depth, complex structure and mining stress. It is a problem that plagues coal mine roadway support. Because these pressures have differences in time speed, force magnitude and direction, they are not isochronous and uneven superimposed pressure combinations. Under the action of this uneven superimposed pressure, the roadway support will be repeatedly damaged. The roadway is jointly affected by the horizontal stress a...

AI Technical Summary

Problems solved by technology

The roadway is jointly affected by the horizontal stress and vertical stress from the rock mass, and the bottom plate and the two sides often bulge seriously, and even lead to the overall collapse of the roadway, which seriously affects the safe production of the coal mine

[0003] For roadways in complex and high-stress areas, there are objective factors that the support is difficult to stabilize. Whether it is development or repair roadway support, anchor-mesh cable-spray support is used. The support method is subjectively unsuitable for complex and high-stress soft rock roadways. sex

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