Tensile reinforcement concrete spray body supporting method for deep soft roadway

Abstract

The invention discloses a tensile reinforcement concrete spray body supporting method for a deep soft roadway. The method includes preliminarily spraying a first layer of concrete on a surrounding rock of the roadway after blasting and punching a hole to mount a primary supporting anchor rod; hanging two layers of reinforcement screens on a head of the reserved primary supporting anchor rod; secondarily spraying concrete on the roadway after the screens are hung on the roadway, punching a hole to mount a secondary supporting anchor rod after secondary concrete spraying, and leading the secondary supporting anchor rod and the primary supporting anchor rod to be in quincunx staggered arrangement; and finally spraying concrete for the third time to cover an exposed portion of the secondary supporting anchor rod. On the basis of sufficiently researching and analyzing breakage forms and mechanisms of the roadway with the broken surrounding rock, tensile reinforcement concrete spray body supporting technology is provided. Repeated practices in fields prove that the technology effectively increases supporting strength of the roadway, and the difficulty about supporting of the deep soft roadway is resolved.

Description

technical field [0001] The invention relates to coal mine roadway support technology, especially the support technology for deep roadways above 800 meters. Background technique [0002] As one of the main energy sources, coal has always occupied a very important position in the whole country. Especially with the rapid development of China's modernization and economy, the demand for resources is also increasing. The coal resources mined are depleting day by day, and the development of deep mining is an inevitable trend of underground mines. [0003] Since the main body of the surrounding rock for deep mining is coal-measure strata, sedimentary structural planes, weak interlayers and muddy interlayers are widely intertwined in coal-measure strata, and the deep rock mass is mostly in the "three highs" (high stress, high and low temperature, and high rock water capacity In the complex environment of pressure), some roadways are also affected by strong excavation disturbance, wh...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of difficult support for deep roadways above 800 meters, the present invention proposes a tensile reinforced concrete spray body support technology on the basis of fully studying and analyzing the damage form and mechanism of the broken surrounding rock roadway, which has been proved by repeated field practice. This technology effectively improves the support strength of the roadway and solves the problem of support in deep soft rock roadways

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