基于应力判据法的施工期岩爆预测研究

Study on Rockburst Forecasting in Construction Period Based on Stress Criterion Method

九岭山隧道为单洞双线铁路隧道,全长15 371 m,最大埋深约862 m。隧道所处地形起伏大,隧道穿越地层较复杂,九岭山隧道开挖后,深埋段岩体因受高围压作用,产生岩爆现象。通过工程实测地应力成果,基于应力解除法的二次应力测试,并采用应力判据法,对掌子面前方进行岩爆预测,结果分析表明:DK1690+130～DK1690+500为中等岩爆区域;卢森、王元汉、王兰生等应力判据的结论更适合九岭隧道岩爆情况,建议在岩爆预测中为主要岩爆发生判别依据。

Jiuling Mountain Tunnel is a single-hole and double-track tunnel with a total length of 15371m and a maximum buried depth is about 862m.The topography of the tunnel fluctuates,and the tunnel passes through the complex strata. After the Jiuling Mountain Tunnel was excavated,the surrounding rock in the deep-buried section was affected by the high confining pressure and the rockburst occurred.Based on the ground stress measured by the stress relief method,the secondary stress test and the stress criterion method were used to predict the rockburst in front of excavating face.The results show that:the part of DK1690+130-DK1690+500is a medium rockburst region.The conclusions of stress criteria from Russense,Wang Yuanhan,and Wang Lansheng are more suitable for the rockburst situation in the Jiuling Mountain Tunnel,and the paper suggests that the main criteria for rockburst should be identified in rockburst forecasting.