深埋隧洞巖爆風(fēng)險(xiǎn)尺寸效應(yīng)問題探討
[Abstract]:Rock burst is a key technical problem in the construction of deep buried engineering. It is very important to accurately predict and evaluate the risk of rock burst. Based on the statistical basis of the actual occurrence of rockburst in 7 deep buried tunnels with different diameters in Jinping with a total length of more than 16 km, the rock burst tendency test, stress state, stress path, energy storage depth, energy release and other methods and indexes are used. The size effect in rock burst risk is discussed. The results show that the rock burst tendency evaluation method based on the mechanical properties of small scale rock has some limitations because it is difficult to reflect the variation of stress conditions. The stress and energy analysis method can accurately reveal the size effect in the risk of rockburst. Based on the deep understanding of the mechanical properties of deep buried marble, combined with the analysis of stress path, energy storage capacity, energy release and other factors, The drainage tunnel with 7 m diameter has higher rock burst risk than the traffic tunnel with 6 m diameter and the diversion tunnel with 13 m diameter. It is proved that there is not a complete linear relationship between rock burst risk and tunnel size, and there exists a certain size effect. According to the field statistical data, no matter the proportion of rock burst section or the ratio of strong to extremely strong rock burst, the drainage tunnel is also higher than traffic tunnel and diversion tunnel, and the frequency and intensity of rock burst in traffic tunnel and diversion tunnel are basically the same. The results are in good agreement with the theoretical analysis.
【作者單位】: 中國(guó)電建集團(tuán)華東勘測(cè)設(shè)計(jì)研究院有限公司;浙江中科依泰斯卡巖石工程研發(fā)有限公司;
【基金】:國(guó)家自然科學(xué)基金青年基金資助項(xiàng)目(51409265) 中國(guó)電建集團(tuán)公司科技項(xiàng)目(GW KJ 2013 11)~~
【分類號(hào)】:U456.33
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