Buffering energy-absorbing support structure for deep roadway floor heave control and construction method thereof

Abstract

The invention relates to a roadway floor heave treatment technique. According to the roadway floor heave treatment technique, a hollow grouting anchor rod at the bottom of a roadway, an inverted archstructure, a composite foam metal material, a steel plate and spring combined structure, a high-strength concrete layer and a prestressed anchor rod for controlling displacement of the two sides are included. After over-excavation construction, roadway surrounding rock is relatively stable, then construction of a roadway floor heave control structure is conducted, when the high stress concentration phenomenon occurs at the bottom of the roadway, concentrated strain energy can be buffered and absorbed under the situation that it is ensured that the interior of the roadway is not deformed in themaximum range, , and the concentrated strain energy is prevented from influencing equipment in the roadway.

Description

technical field [0001] The invention relates to the field of undercut support in soft rock roadways, in particular to a buffer energy-absorbing support structure for deep roadway undercut control and a construction method thereof. Background technique [0002] As my country's coal mining develops more and more deeply, the problem of high ground stress is becoming more and more prominent, and the underlying problem caused by it is also becoming more and more serious. In the process of coal mine production, the bottom of the underground roadway will affect the normal operation of coal mine safety production. Usually, it will increase the approach of the roof and floor of the roadway to varying degrees, resulting in serious deformation of the roadway, and even the closure of the roadway section. Serious Threats to the life safety of underground workers. [0003] At present, there are two main methods to deal with the roadway bottom problem: one is passive repair, remove the bo...

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Problems solved by technology

[0004] For example, the Chinese patent (Patent No.: 201620043438.2) discloses a structure that utilizes the anti-bottom arch structure to control the bottom sill, but it does not consider the condition of the floor after the anti-bottom arch structure is damaged due to the deformation of the surrounding rock of the roadway in the later period.

For example, the Chinese patent (patent number: 201420476275.8) discloses an inverted arch structure for soft rock tunnels, which has only one layer of energy-absorbing structure, which cannot meet the surrounding rock pressure of deep soft rock roadways, and is not suitable for deep coal mine roadways.

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