A mine-used frp grid-coal gangue-self-compacting concrete regenerated roof and its construction method

Abstract

The invention discloses a mine-used FRP grid-coal gangue-self-compacting concrete regenerated roof and a construction method thereof, comprising FRP grids, coal gangue filling materials and self-compacting concrete. The steps of the method of the present invention include: laying the first layer of FRP grid along the floor of the goaf after mining the top layer; filling the pulverized coal gangue; then laying the second layer of FRP grid; continuing to fill the coal gangue; after the filling is completed Self-compacting concrete is used to fill the coal gangue void at one time. The beneficial effects of the present invention are: the present invention can effectively restrain the lateral deformation of the bulk coal gangue material by adopting the light weight, high strength and corrosion-resistant FRP grid, improve the shear strength and elastic modulus of the coal gangue bulk material, and Using self-compacting concrete to fill the voids of coal gangue bulk materials can effectively inhibit the non-uniform settlement of bulk aggregates. The invention has simple construction technology, fast construction speed and good stability of the formed regenerative roof.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a mine-used FRP grid-coal gangue-self-compacting concrete regenerated roof and a construction method thereof. Background technique [0002] When the thick coal seam is mined in layers, the roof formed by the natural cementation of the collapsed rock strata of the upper layer after a certain period of time is called the regenerated roof. The formation of the regenerated roof includes two processes of compaction and cementation of the collapsed rock formation. In order to reduce the time required for natural cementation, yellow mud or water glass is usually used as the cementing material. In order to improve the stability of the recycled roof, a layer of metal mesh or plastic mesh is usually laid along the upper stratified roof. Since the metal mesh is easy to corrode and the strength of the plastic mesh is insufficient, the regenerated roof formed by the above method usually...

AI Technical Summary

Problems solved by technology

Because the metal mesh is easy to corrode and the strength of the plastic mesh is not enough, the regenerated roof formed by the above method usually has the characteristics of insufficient stability and poor bonding characteristics between broken rock masses

In the process of lower layer mining, the traditional bolt support technology cannot effectively control the stability of the regenerated roof because it cannot be anchored to the stable rock formation, which poses a threat to the safe and efficient production of coal mines

At the same time, in the process of mining extremely close coal seams, the disturbance caused by the mining of the upper coal seam to the floor will also lead to no stable and reliable anchorage area for the support of the lower roadway

In order to ensure that the bolt can be anchored to the stable rock formation, it is necessary to develop a regenerative roof with simple construction technology and high reliability, so as to change the current situation of difficult support and insufficient stability in layered mining

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