Numerical Studies on Rockbursts in Tunnels with High In Situ Stresses and Geothermally Rich Areas
Zhonglian Luo; Jiaming Li; Shibin Tang; Xiaoshuang Li; Leitao Zhang
To further understand the stress evolution and rockburst occurrence mechanism in geothermally rich areas in the Sichuan&ndash:Tibet railway project, this work presents a theoretical study of the influence of temperature change on the failure of rock, conducts numerical studies of the temperature and stress evolution in the surrounding rock during high-temperature tunnel excavation, and further studies the possibility of rockbursts under high in situ stress and high-temperature conditions. Rockbursts occur frequently at the junction of a face and tunnel wall, and ventilation and cooling of tunnels reduce the stress and sometimes reduce the possibility of rockbursts. Continuous cooling leads to a larger tensile stress and the possibility of failure of wall rock. In addition, the influence of the convection heat transfer coefficient, in situ stress and fault effect on the stress distribution and possibility of rockbursts are also discussed in detail. The results are beneficial for the prevention and control of rockbursts in high in situ stress and geothermally rich areas.
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