Large-deformation broken surrounding rock roadway management method

Abstract

A large-deformation broken surrounding rock roadway management method includes forming deep grouting holes in a deformed roadway for grouting, after deep grouting is completed, performing construction on the deformed roadway, removing deformed parts of the top, side and bottom of the deformed roadway, recovering an original design section of the roadway, supporting the whole roadway section intensively, then forming shallow grouting holes in the top and sides of recovered original design section at equal intervals, performing secondary grouting, grouting the shallow grouting holes through grouting anchors to glue grout and roadway surrounding rocks stably, and completing recovery of the deformed roadway. The existing broken roadway supporting technology, roadway surrounding rock reinforcing theory and prestress technology are combined, on the basis of improving the stress state of the roadway surrounding rock, the technical manners of surrounding rock deep grouting, high-strength anchor intensive anchoring and wall back filling are adopted, a compound support structure is formed between the roadway broken surrounding rock and the roadway support, mechanical characteristics of the surrounding rock are optimized effectively, bearing capacity of the surrounding rock is improved, and stability of the roadway section is guaranteed.

Description

technical field [0001] The invention relates to a treatment method for broken surrounding rock roadways, especially suitable for treating high-stress and large-deformed broken surrounding rock roadways in deep coal mines, and also suitable for roadways (tunnels) and tunnels in mining, construction, water conservancy, transportation, military industry and other departments. room support. Background technique [0002] Coal mine roadway support technology is a key technology in coal mine safety mining. With the depletion of shallow resources, underground mining extends to the deep, and the effective maintenance of deep roadways under complex geology and high stress conditions has become an important topic at home and abroad. [0003] When excavating roadways in deep wells and high-stress surrounding rocks, various weak surfaces and discontinuous rock masses in the original equilibrium state will be destroyed after roadway excavation, and the surrounding rocks of the roadway wi...

AI Technical Summary

Problems solved by technology

If inappropriate support measures are adopted, the deformation of the surrounding rock of the roadway will become more severe, which will eventually lead to the destruction of the roadway

At present, "secondary support" is often used for repairing high-stress and large-deformation roadways at home and abroad, that is, after the roadway has a certain deformation to release the pressure and is damaged, the secondary support is implemented in order to maintain the long-term stability of the roadway, but in the deep In areas such as structural pressure zones, high stress and dynamic pressure superimposed areas, problems such as deformation and failure still occur after secondary support is used, and even three or four times of support are required. For roadways that have been supported many times, the deep separation layer of the surrounding rock of the roadway , the regenerated cracks are more developed, and the measures to improve the support strength by only restoring the designed section are difficult to be effective. The roadway is repeatedly damaged and the deformation of the surrounding rock cannot be effectively controlled for a long time. There are many safety hazards, which seriously restrict the safe production and efficiency improvement of the mine

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