基于岩爆倾向性的高黎贡山深埋隧道岩爆预测研究

Study on rock burst prediction in the deep-buried tunnel at Gaoligong Mountain based on the rock proneness

岩爆的预测研究一直是地下工程的世界性难题之一,岩爆倾向性是岩爆发生的一个重要条件。本文以大瑞铁路高黎贡山深埋隧道为例,在野外地质调查和室内岩石力学实验测试分析的基础上,计算分析了高黎贡山深埋隧道花岗斑岩岩体的弹性应变能指数WET、岩石脆性系数B和最大储存弹性应变能指标Es等岩爆倾向性指标。在ANSYS软件平台上,进行了隧道开挖三维有限元数值模拟,根据Russense岩爆判据对隧道开挖断面的岩爆危险性进行预测。研究结果表明:高黎贡山深埋隧道花岗斑岩以弱岩爆倾向性为主,在隧道开挖后,局部位置存在中等岩爆的可能。

The rock burst forecast research is the one of the worldwide difficult problems in underground engineering,and the rock burst proneness is an important condition for the rock burst occurring.Taking the deep-buried tunnel at Gaoligong Mt.of Darui Railway as the example,and based on the field investigation and the laboratory rock mechanical tests,the indices for the rock burst proneness of the granite-porphyry rock mass in the tunnel are computed and analyzed,which include the elastic energy of deformation index WET,the rock brittle coefficient B and the biggest storage elastic strain energy target Es.The numerical simulations with three dimensional finite elements for the tunnel excavation are carried out based on the ANSYS software,and the burst risk forecast to the tunnel excavation cross section according to the Russense rock burst criterion is made.The study results indicate that the burst proneness of the deep-buried tunnel granite-porphyry at Gaoligong Mt.are mainly the weak rock burst proneness,and there is the possibility with medium rock burst on some sections of the tunnel after the tunnel excavation.