Supporting method for soft rock roadway surrounding rock under high impact ground pressure stress

Abstract

The invention provides a supporting method for soft rock roadway surrounding rock under high impact ground pressure stress. A pressure relief groove is impacted and crushed twice through the supporting method, more gaps are generated in a rock mass, the problems that the generated gaps are too small due to the fact that crushing is carried out only once, and slurry is difficult to make full contact and bond with the rock mass are solved, and a pot-shaped cavity is exploded at the bottom of a shot hole; meanwhile, cracks in a surrounding rock body are activated, the voidage of the cracks is improved, the stress of the surrounding rock around a roadway is sequentially released through a crack channel expanded by the excitation gap after the gap is excited by blasting vibration for 8 hours, generated gangue is cleaned, and concrete adopting fine aggregate is injected into the pot-shaped cavity through the shot hole and then is poured into the pot-shaped cavity through the shot hole; a high-pressure gas release mechanism is started, released gas enables the pot-shaped cavity to generate high-pressure shock waves, and the concrete is pushed by the shock waves to further crush and separate the rock mass in a pressure relief groove; and meanwhile, the high-pressure gas extrudes the concrete in the pot-shaped cavity into newly-generated gaps, and injected grout is cemented more tightly.

Description

technical field [0001] The invention relates to the technical field of roadway support, in particular to a method for supporting the surrounding rock of a soft rock roadway under high impact rock pressure. Background technique [0002] As the mining depth increases, the strength of the original high-strength rock layer will decrease in the high-pressure stress environment, and the rock stress softening phenomenon will appear, especially the sandpaper mudstone and sandpaper shale, which are originally moderately strong, are relatively easy to transform into For mudstone with extremely low rock strength, due to the low strength of mudstone, the surrounding rock deforms and destroys rapidly after excavating the roadway under high ground stress, making it difficult to support in time. Grouting improves the structural strength, which can greatly alleviate the impact of high ground stress near the roadway and effectively control the damage and deformation of surrounding rocks; the...

AI Technical Summary

Problems solved by technology

[0002] As the mining depth increases, the strength of the original high-strength rock layer will decrease in the high-pressure stress environment, and the rock stress softening phenomenon will appear, especially the sandpaper mudstone and sandpaper shale, which are originally moderately strong, are relatively easy to transform into For mudstone with extremely low rock strength, due to the low strength of mudstone, the surrounding rock deforms and destroys rapidly after excavating the roadway under high ground stress, making it difficult to support in time. Grouting improves the structural strength, which can greatly alleviate the impact of high ground stress near the roadway and effectively control the damage and deformation of surrounding rocks; the pressure relief methods in the prior art mainly include manual excavation and blasting vibration pressure relief. Manual excavation pressure relief It takes a long time to wait. The method of blasting and vibration relief is easy to construct. The vibration is transmitted from the bottom corner to the surrounding rock of the roadway, which can have a good effect of stimulating gaps, but it is difficult to quantitatively grasp during construction, and the on-site operation is more difficult. , due to the low rock strength, the rock mass breaks into smaller rock blocks, the crack density is high, but the crack opening degree is small, which is not conducive to the grouting to fully contact the rock mass in the pressure relief groove

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