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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 prediction of rockburst has been one of the worldwide problems of underground engineering. Rockburst tendency is an important condition of rockburst. Taking the Gaoligongshan deep tunnel of Darui Railway as an example, based on the field geological investigation and laboratory tests of rock mechanics, the elastic strain energy index (WET) of granite porphyry in the deep tunnel of Gaoligongshan Mountain is calculated and analyzed. The rock Brittleness coefficient B and the maximum storage elastic strain energy index Es and other rock burst tendencies. In ANSYS software platform, three-dimensional finite element numerical simulation of tunnel excavation was carried out. According to Russense rock burst criterion, the rock burst risk of tunnel excavation was predicted. The results show that the granite porphyry in the Gaoligongshan deep tunnel is dominated by the weak rockburst and there is a possibility of moderate rock burst in the local area after tunnel excavation.