Inner pull anchor cable structure of long-span cutting top roadway-forming roof

Abstract

The invention relates to an inner pull anchor cable structure of a long-span cutting top roadway-forming roof. The inner pull anchor cable structure of the long-span cutting top roadway-forming roof includes first anchor cable systems A1 and second anchor cable systems A2 alternately arranged along a roadway construction direction, and inner pull anchor cable truss girder systems A3 disposed between the A1 systems and the A2 systems; wherein the A1 system focuses on the support of the side roof depending on the solid coal, the A2 system focuses on the support of the middle part of the roof, and the A3 system focuses on the mechanical connection between the side roof structure of the goaf and the deep stable surrounding rock; and the three anchor cable systems interact and cooperate with each other through the transfer effect of the intrinsic forces, so as to jointly achieve roof stability control during excavation. The lower truss girder structure of the A3 has the function of pressure reducing and energy absorption, which can prevent the truss girder structure from tearing while applying sufficient surface protection function to the roof. The anchor rod and the anchor cable are integrated in the same row, which is beneficial to improve the stress state of the shallow coal rock mass, improve the reinforcement strength of the shallow coal rock mass, and limit the deformation and damage of the shallow surrounding rock.

Description

technical field [0001] The invention relates to the field of coal mine roadway support, in particular to an inner pull anchor cable structure for a large-span roof cut into a roadway roof. Background technique [0002] Roof cutting into roadway is a new mining method without coal pillars. It cancels the filling rock pillars in the conventional gob-side entry retention, and does not need to use artificial filling materials. It only needs to unload the roof and lower the roof. Coal pillar-free mining can be realized by combining the crushing and swelling characteristics of the coal body. In fact, due to the particularity of the roadway cutting process without coal pillars, the asymmetry of the surrounding rock structure and stress distribution along the central axis of the roadway will result. 1. In the coal rock mass that has been damaged during the compaction process, one side is the solid coal that maintains good integrity. The mechanical properties of the two are signific...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problem of non-uniform settlement of the roof of the roadway without coal pillars, the present invention provides an inner pull anchor cable structure for the roof of the roadway with a large span

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