|
Highway tunnel surrounding rock stability is crucial in the tunnel construction process , the surrounding rock instability hydropower chamber traffic tunnel , the mine workings can be destroyed , damaged production equipment, threat to the personal safety of the engineering staff , so to carry out the stability of surrounding rock studies , effective and rational development of underground space , construction and optimization , and ensure that the project is carried out smoothly , have great significance . Qinling highway tunnel relying on engineering , tunnel depth ( 800.0m ) , line length (18.02 x 2km) , the complex geological conditions , the formation lithology mixed gneiss , brittleness , and in the highlands stress level , prone to rock burst power disaster , and easy to produce zonal disintegration phenomenon . From home and abroad on the definition of the deep and Highland stress deep rock mechanical properties of Research paper leads to the rockburst partition rupture of two features of scientific phenomena , combined Zhongnanshan Tunnel project examples from rock MTS-AE test , live sound strength \phenomenon. This article and circular tunnel stress redistribution analysis , come to the top and bottom of the tunnels prone to stress concentration , to meet two conditions : the rockburst ① rock body reserves sufficient elastic strain energy ; ② caused by the destruction of the stress concentrated. Using acoustic emission (Acoustic Emission, AE) forecasting techniques integrated forecasting and analysis , come to the rockburst the acoustic emission characteristics and the dynamic evolution . FLAC3D numerical analysis software for numerical simulation analysis concluded that in the the the duct construction process , the nearer location away from the main tunnel , near the rock mass disturbance by the greater disturbance range coincides with the disturbance range with the original tunnel construction process , and to continue extending deep to the rock mass , the larger the top of the duct sink . Rock burst is a kind of energy release , both gradual process , the mutation process rockburst occurrence is directly related to the excavation method and support measures , therefore , to carry out research rockburst Countermeasures Highland stress Deep Underground Engineering prevention forecasting of rock burst phenomena provide a reliable basis , but also has important theoretical and engineering value .
|