Double-layer anchoring and balancing arch supporting system for coal roadway with extremely-weak top plates

Abstract

The invention relates to a double-layer anchoring and balancing arch supporting system for a coal roadway with extremely-weak top plates. A roadway waste section is enlarged to be reserved for deformation, the roadway section is a tangential arching breaking face, a metal net and a reinforcing steel bar stair joist is laid on the surface of the roadway, anchor rods are installed on the top plate of the roadway and on sides of the roadway and penetrate through the metal net and the reinforcing steel bar stair joist to be anchored into a coal bed through an anchoring agent, anchor rod trays are used for exerting pretightening forces on anchor rods to form anchor net preliminary supporting, anchor cables are installed among anchor rods on the top plate of the roadway and penetrate through the metal net and the reinforcing steel bar stair joist to be anchored into the coal bed through the anchoring agent, and anchor cable trays and locks are used for exerting pretightening forces on anchor cables to form secondary prestress anchor cable reinforcing supporting. The double-layer anchoring and balancing arch supporting system for the coal roadway with extremely-weak top plates is low in construction cost, good in supporting effect, simple, practical and economical.

Description

technical field [0001] The invention relates to the field of mine roadway support, in particular to a double-layer anchored balanced arch support system for extremely weak roof coal roadways. Background technique [0002] my country's coal mines mainly adopt the method of underground mining. The roadways excavated in the coal seam account for more than 80% of the total length of the annual excavated roadways. Maintaining the long-term stability and safety of coal roadways has important practical significance for coal mine construction and efficient and safe production. With the development of the depth and breadth of coal mining in my country, the section of coal roadways increases, and the problem of coal roadway support becomes increasingly prominent. [0003] Coal mine roadway support technology is the key technology that must be faced in the mine construction process. With the further development of the coal mining industry, the geomechanical environment of coal rock mas...

AI Technical Summary

Problems solved by technology

Although scholars at home and abroad have done a lot of scientific research work on coal and rock roadway engineering, due to the complexity of the research objects of roadway support and the diversity of geological conditions, the current design of roadway support still remains on the basis of empirical engineering analogy , has not yet formed a unified theory and support system

In particular, the roof and floor of coal roadways with extremely weak roofs are poor, and the strength of the coal seam is relatively high. When the thickness of the coal seam is thin, it is impossible to implement anchor net support, and the support is very difficult; and after the mining roadway with a rectangular section is excavated, the roof It is not stable and easy to collapse, and the bolt can only play the role of suspension, and the supporting effect is not obvious; the deformation of the roadway is large, and the support is difficult, which seriously restricts the improvement of roadway excavation efficiency and mine production efficiency

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