大岩湾高速铁路隧道岩爆综合分析预测

针对沪昆高速铁路大岩湾隧道埋深大、岩性脆而坚硬的特点,选取隧道典型断面进行了水压致裂地应力原位测试,获得了实测深度范围内地应力的大小和方向。为对隧道全线进行岩爆预测预警,在地应力测试的基础上,采用弹性应变能指数法、应力强度比法、有限元反演法对隧道岩爆进行分析。最后,以大岩湾隧道地应力条件、岩性特征、围岩结构特征、地下水条件四个方面为基本条件,对隧道岩爆进行了综合分析预测。结果表明:该综合预测方法的准确度较以往单一的岩爆预测方法有了很大提高,对隧道岩爆预测预警有很好的实际指导意义。

Comprehensive prediction of rock burst in Dayan Bay high-speed railway tunnel

Dayan Bay tunnel in Shanghai-Kunming high-speed railway is deeply buried and its rock lithology is brittle and hard. Select typical tunnel cross section to do hydraulic fracturing field geostress test. Get the stress in the measured depth. In order to forecast the rock burst in the whole tunnel, some other methods have been used based on field geostress test. They are the elastic strain energy index method, stress-strength ratio method and the finite element inversion method. Lastly, make the stress conditions, lithology, structure characteristics and groundwater conditions of surrounding rock as the general conditions. Comprehensively predict the rock burst in Dayan Bay tunnel. The result shows this comprehensive prediction method is more accurate than the single rock burst prediction method used before. And it has a certain guiding Significance in practice.