基于应力判据法适宜性分析的隧道施工期岩爆预测研究

Study on Forecasting of Rock-burst during Construction Period of Tunnel Based on Suitability Analysis of Stress Criterion

采用现场测试结合理论研究的方法对九岭山隧道进行岩爆预测。九岭山隧道穿越地层主要为花岗岩硬脆性岩浆岩,最大埋深约为862 m。基于应力解除法对洞壁进行二次应力测试以及点荷载试验。现场测试得出:九岭山隧道已开挖断面DK1687+240的洞壁切向应力为41. 36 MPa,岩石单轴抗压强度为106. 38 MPa,将不同判据得出的结果与实际情况进行对比,认为王元汉和王兰生的判据符合九岭山隧道的实际情况,并据此判断九岭山隧道未开挖段DK1687+260～DK1687+500为轻微岩爆区域。

Rockburst prediction of Jiulingshan Tunnel is carried out by field test combined with theoretical research. The stratum through which Jiulingshan Tunnel passes is hard-brittle magmatic rock of granite with a maximum burial depth of about 862 m. Based on the stress relief method, the secondary stress test and point load test of the tunnel wall are carried out. Field tests show that the tangential stress of the excavated section DK1687 + 240 of Jiulingshan Tunnel is 41.36 MPa, and the uniaxial compressive strength of rock is 106.38 MPa. By comparing the results from different criteria with the actual situation, it is concluded that the criteria of Wang Yuanhan and Wang Lansheng fits the actual situation of Jiulingshan Tunnel and that the unexcavated section DK1687+260 ~ DK1687+500 of Jiulingshan Tunnel is a slight rock burst.