AUTOR(I) / AUTHOR(S): Su Peidong, Li Yougui, Qiu Peng, An Xingling

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DOI:  10.46793/ACUUS2025.2.19.140

SAŽETAK / ABSTRACT:

High-pressure gas outbursts and coal and rock outbursts are common geological disasters in tunnel engineering. Domestic and foreign research results regarding coal and gas outbursts are rich and relatively mature, but there are few discussions on high-pressure gas outbursts in non-coal tunnels. This study focuses on the tunnel gas and rock outburst mechanism in non-coal formations. From the perspective of the energy method, gas and rock outbursts occur when the energy supply exceeds the energy consumption. The energy sources are the elastic potential energy of the rock mass and the gas expansion work, and the energy-consumption part is mainly the rock mass breaking work and the ejection work. The energy model is used to study the mechanism of high-pressure gas and rock eruption, derive the formula of high-pressure gas pressure and minimum safe thickness of rock mass; combined with the Hongdoushan No. 1 slope well engineering case verified the mathematical expression. The critical condition for the outstanding is that the outstanding energy is completely used to break the rock. High-pressure gas blasting safety thickness formula for outburst prevention, high-pressure gas pressure has a significant influence on the minimum safe thickness of the rock mass. The energy method considers the effects of the ground stress, the gas pressure, and the physical and mechanical properties of the surrounding rock on the outburst and comprehensively considers the factors that affect the outburst. The FLAC3D software was used to invert the gas pressure during the high-pressure gas outburst in the Hongdoushan No. 1 inclined well to be 7.5 MPa, which was consistent with the actual situation, and the applicability of the formula was verified. The results of this study can provide ideas for preventing outbursts of high-pressure gas in non-coal formation tunnels and reducing outburst accidents.

KLJUČNE REČI / KEYWORDS:

gas and rock outburst; energy method; safe thickness; non-coal tunnel

PROJEKAT / ACKNOWLEDGEMENT:

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