Connection structure and construction technology of artificial dam body and coal pillar dam body of underground reservoir

Abstract

The invention discloses an underground reservoir artificial dam body and coal pillar dam body connecting structure and further discloses a construction technology of the underground reservoir artificial dam body and coal pillar dam body connecting structure. The underground reservoir artificial dam body and coal pillar dam body connecting structure comprises an artificial dam body and a coal pillar dam body. A dam body groove is formed in the coal pillar dam body and provided with a groove oblique surface, and an acute angle is formed between the extending directions of the groove oblique surface and the artificial dam body. Anchor rod drill holes are formed in the groove oblique surface, and the extending directions of the anchor rod drill holes are perpendicular to the extending direction of the groove oblique surface. An inverted-hook-type grouted anchor rod is fastened in each anchor rod drill hole, and a plurality of reinforcement framework beams are arranged in the artificial dambody. The two ends of each reinforcement framework beam are in fastening connection with the ends of the inverted-hook-type grouted anchor rods on the two sides of the reinforcement framework beam correspondingly. According to the underground reservoir artificial dam body and coal pillar dam body connecting structure and the construction technology thereof, the connecting strength and stability are improved, and the construction technology is further simplified.

Description

technical field [0001] The invention relates to the field of protection and utilization of water resources in coal mining, in particular to a connection structure between an artificial dam body of an underground reservoir and a coal pillar dam body and a construction process thereof. Background technique [0002] In order to solve the contradiction between large-scale coal mining and water resource loss, and realize water conservation mining, Shenhua Group proposed a technical approach to store groundwater by using coal mine underground reservoirs. That is to use the rock mass voids in the goaf formed by coal mining to store water, connect the coal pillar dam body (safety coal pillar) with an artificial dam body to form a reservoir dam body, and build mine water storage facilities and water intake facilities at the same time to make full use of the goaf The natural purification effect of the rock mass in the area on the mine water realizes the reuse of water. The safe opera...

AI Technical Summary

Problems solved by technology

[0007] The existing coal pillar dam slotting method and the arrangement of the anchor rods are unreasonable, that is, the arrangement direction of the anchor rods is perpendicular to the main force direction (that is, the displacement direction) of the artificial dam body, which makes the anchor rods mainly Bear the shearing action, and the characteristic of the bolt in the surrounding rock reinforcement is tensile but not shearing, which makes the current arrangement make the bolt easier to be cut off, which in turn affects the stability of the entire dam body

[0008] The existing bolt fixing method (one end is bonded in the drill hole of the coal pillar dam with anchoring agent, while the other end is free) is unreasonable, resulting in the fact that the artificial dam cannot pass through the anchor and the coal pillar dam after pouring Form an organic whole, so that the artificial dam body and the coal pillar dam body are prone to relative displacement or deformation, which in turn affects the reliability of the two joints

[0009] After the auxiliary roadway is excavated, a certain range of loose circles will be formed around the roadway, especially the cracks in the coal body near the slot of the coal pillar dam will be more developed, and the existing artificial dam pouring method does not consider the coal in this area. The grouting reinforcement of the existing cracks in the body increases the possibility of water seepage in this area. Under the action of long-term seepage, the dam body of this part of the coal pillar may even be damaged and unstable

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