Loose blasting method for rock roadway tunneling in high ground stress environment

Abstract

The invention discloses a loose blasting method for rock roadway tunneling in a high ground stress environment. The method comprises the steps that geological conditions of roadway surrounding rock are investigated and analyzed, sampling is conducted on typical parts of a rock roadway, and coal and rock physical and mechanical parameters and firmness coefficients are obtained; the state of a roadway rock stratum is accurately detected, and the stress concentration distribution condition of the roadway surrounding rock is determined through data analysis; main stress distribution areas of the surrounding rock are determined by means of a computer numerical simulation technology, the models of a drilling machine and a drilling rod adopted for loose blasting are determined, loose blasting drilling hole arrangement parameters are set, the loose blasting effect is simulated, and the loose blasting explosive load is determined; a loose blasting explosive loading structure is researched; and on-site loose blasting testing is conducted, and data are recorded. According to the loose blasting method for rock roadway tunneling in the high ground stress environment, the drilling hole arrangement parameters and blasting parameters required by loose blasting of rock roadway tunneling in the high ground stress environment are comprehensively determined through various research means, the stress in front of the roadway can be released in advance, the roadway support stability condition after blasting is considered, and the purpose of safe, rapid and efficient tunneling is achieved.

Description

technical field [0001] The invention relates to the technical field of deep rock roadway blasting, in particular to a loosening blasting method for rock roadway excavation under high ground stress environment. Background technique [0002] Shallow coal resources are gradually reduced and exhausted, and it has become an inevitable trend for coal mining to gradually shift to deep. As the mining depth continues to increase, there are more and more deep rock roadway projects, followed by more complex and harsh geological and engineering environments, and a significant increase in ground stress. Deep roadways under high ground stress are more affected by dynamics. For severe and sensitive. At the same time, due to the loose and weak characteristics of the roadway roof, floor and two sides of the surrounding rock, the bearing capacity is relatively low, and the phenomenon of broken and bulging is obvious, which is gradually affected by the surrounding mining. Ensuring the safety...

AI Technical Summary

Problems solved by technology

[0003] In addition, the traditional loosening blasting technology does not consider the stability of the support after blasting, which may easily cause secondary support in the roadway and increase economic costs for coal mining

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