Deep mine hard rock roadway stress adsorption layer structured support method

Abstract

The invention discloses a deep mine hard rock roadway stress adsorption layer structured support method. In the initial stage after a deep roadway is excavated, concrete is sprayed to form a concrete flexible support layer. 4.5 m-5.0 m blastholes are drilled in the two sides of the roadway and an arch top, the spaces in the range of 2 m-2.5 m of the bottoms of the blastholes are filled with explosive for conducting soft fragmentation explosion to construct an arch broken rock stress adsorption layer. Grouting conduit anchor rods are driven in through the blastholes, cement paste is poured into the grouting conduit anchor rods to reconstruct structure support bodies. Paste is poured into the blastholes so as to fix the grouting conduit anchor rods, so that a rockburst prevention support structure formed by the arch broken rock stress adsorption layer, the structure support bodies, an isolation rock body, the concrete flexible support layer and the grouting conduit anchor rods of the high-stress deep hard rock roadway in a cooperative mode is achieved. Through the stress adsorption layer formed by the support technology, high stress and gathering of stress energy of surrounding rock of the isolation rock body can be effectively reduced, rockburst is restrained, and tunneling safety and efficient construction of the deep hard rock rockburst type roadway can be well achieved.

Description

technical field [0001] The present invention relates to a deep mine hard rock roadway support method, in particular to a deep mine hard rock roadway stress adsorption layer structured support method, which is mainly applicable to the support during the excavation process of deep rockburst type hard rock roadway, It can be extended to the support field of deep underground chambers, and is especially suitable for disaster control in rockburst-prone areas. Background technique [0002] Due to the complexity of the stress field of the deep rock mass, the first thing that the deep hard rock roadway faces is the rockburst disaster, which makes the roadway excavation construction more and more difficult. As the mining depth increases, the frequency of rockbursts also increases significantly. And under deep conditions, the failure of high-stress rockburst rock mass has the characteristics of severe impact failure, and the failure process is often sudden. [0003] Hard rock in deep...

AI Technical Summary

Problems solved by technology

Conventional roadway support principles and support technologies are difficult to adapt to the deep hard rock engineering environment

Some deep well projects use pressure relief blasting to improve the stress state of the roadway surrounding rock, but it ignores the secondary dynamic disturbance of the roadway surrounding rock caused by the pressure relief blasting, which may cause secondary damage to the roadway surrounding rock when the charge is not well controlled.

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