Prestressed anchor-filled integrated support structure and method for strong dynamic pressure roadway under mine

Abstract

The invention discloses a prestressed anchor-filling integrated support structure for strong dynamic pressure roadway under mine, comprising: a steel mesh attached to the excavation surface of the roadway, a prestressed high-strength anchor rod and an anchor cable for fixing the steel mesh , the outer side of the steel mesh is provided with a mold bag filling mortar layer, and the inner side is provided with a concrete spray layer. The supporting method is to lay double-layer flexible plastic mold bags between the steel mesh and the excavation surface of the roadway, and the steel mesh is anchored with anchor rods. The cable is permanently fixed on the roadway wall, and the mixed mortar is transported to the preset mold bag between the steel mesh and the roadway wall for filling. After filling, the concrete is sprayed from bottom to top inside the steel mesh. The invention can effectively form a full-width active compressive stress zone between the anchor rods, thereby actively restoring the three-dimensional stress state in the shallow area of ​​the roadway, maintaining the structural integrity of the surrounding rock, significantly improving the self-bearing capacity of the surrounding rock and resisting shear expansion deformation, and realizing Efficiently control the stability of surrounding rock.

Description

technical field [0001] The invention relates to the field of strong dynamic pressure roadway support construction in coal mines. More specifically, the present invention relates to a prestressed anchor-fill integrated support structure and method for underground strong dynamic pressure roadway in mine. Background technique [0002] As the main energy source in the world, coal has always occupied a very important position. Deep coal mining is an inevitable requirement of my country's economic development. Shallow coal resources are constantly decreasing, and the central and eastern regions are almost exhausted, but deep coal resources are relatively rich. The total coal resources buried below 2,000 meters are 5.9 trillion tons, of which More than 50% of them are buried deeper than 1,000 meters, and they are mainly distributed in the central and eastern regions of my country. Most of the coal mines in this area have been mined at a depth of 1,000 meters or below. In order to...

AI Technical Summary

Problems solved by technology

Not only is the safety of the roadway difficult to guarantee, but it also affects the normal continuation of mine mining and production. At the same time, it consumes a lot of manpower and material resources, which seriously hinders the safe and efficient production of the mine.

At home and abroad, joint reinforcement schemes such as grouting anchor rod, grouting anchor cable, and integration of drilling, anchoring and grouting have been tested. Although some improvements can be achieved, the material cost is increased, the construction process is complicated, and it is difficult to be widely promoted. rock control effect

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