A support method for surrounding rock of soft rock roadway under high impact geocompressive stress

Abstract

According to the method for supporting the surrounding rock of soft rock roadway under high impact geocompressive stress, the pressure relief groove is subjected to two impacts and crushed by the supporting method, so that more gaps are formed in the rock mass, so as to avoid The cracks generated by one crushing are too small, and it is difficult for the slurry to fully contact and cement with the rock mass. A pot-shaped cavity is blown out at the bottom of the blasthole, and the cracks in the surrounding rock are activated at the same time to improve the porosity of the cracks. The stress of the surrounding rock is released in an orderly manner through the fissure channel expanded by the excited gap, and the generated gangue is cleaned up. After the concrete using fine aggregate is injected into the pot-shaped cavity through the blasthole, the high-pressure gas release mechanism is activated to release the gas. A high-pressure shock wave is generated in the pot-shaped cavity, and the concrete is pushed by the shock wave, which further crushes and separates the rock mass in the pressure relief groove. more closely.

Description

technical field [0001] The invention relates to the technical field of roadway support, in particular to a support method for surrounding rock of soft rock roadway under high impact geocompressive stress. Background technique [0002] As the mining depth increases, the strength of the originally high-strength rock layer decreases in the high-pressure stress environment, and the phenomenon of rock stress softening occurs, especially the medium and firm sandpaper mudstone and sandpaper shale. The mudstone with extremely low rock strength, due to the low strength of the mudstone, the surrounding rock is rapidly deformed and damaged after excavation of the roadway under high ground stress, and it is difficult to support in time. Grouting improves the structural strength, can greatly alleviate the influence of high ground stress near the roadway, and effectively control the damage and deformation of the surrounding rock; the existing pressure relief methods mainly include manual ...

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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