- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | MENG Wei, HE Chuan, WU Fangyin, CHEN Ziquan, ZHOU Zihan, KOU Hao. Effects of Thermal Stress of Rock Masses Generated by Geothermal Gradient on Rockburst Prediction[J]. Journal of Southwest Jiaotong University, 2022, 57(4): 903-909. doi: 10.3969/j.issn.0258-2724.20200737
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To make the stress obtained by hydraulic fracturing in a high geo-temperature environment more truly predict rockbursts, it is proposed that the thermal stress of rock masses generated by geothermal gradients should be considered during the rockburst prediction. Combined with the theory of elasticity, the theoretical stress solution of hydraulic fracturing in a high geo-temperature environment was obtained firstly. Then the rockburst prediction of a circular tunnel was conducted based on this theoretical stress solution. Finally, according to the thermal stress formula of rock masses, the rockburst prediction for the Sangzhuling tunnel was applied. The results show that the instantaneous shut-in pressure and the horizontal principal stress are increased by about one time the thermal stress of rock masses, and the reopening pressure is increased by about two times the thermal stress of rock masses. In addition, vertical stresses do not change. If the stress measured by hydraulic fracturing in a high geo-temperature environment is directly used for rockburst prediction, the estimated grade of rockbursts is high when horizontal in-situses are greater than vertical in-situ stresses, and the predicted position of rockbursts is inconsistent with reality when horizontal in-situ stresses are between gravitational stresses and vertical in-situ stresses. In addition, the estimated grade of rockbursts is low when horizontal in-situ stresses are less than gravitational stresses. The thermal stress of rock masses for the Sangzhuling tunnel is about 61% of the gravitational stress of rock masses. The rockburst prediction can lead to serious errors if the thermal stress is not considered.
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