Abstract
ABSTRACT In this manuscript, we adopted the borehole overcoring method to carry out the in-situ stress for field test, the drilled inclusion core is subjected to indoor confining pressure calibration test, and the elastic modulus and Poisson’s ratio of the drill core are measured to calculate the right hole K44 + 858 m of the Micang Mountain tunnel. The maximum principal stress is 28.43 MPa, the intermediate principal stress is 14.13 MPa, the minimum principal stress is 11.94 MPa. The uniaxial compressive strength test of the drilled core was carried out, and the uniaxial compressive strength σc of the granite is about 102.7 MPa. The three-dimensional model was established by FLAC3D numerical simulation software and analyzed the stress distribution law of the right tunnel at K44 + 858. According to the “Code for Design of Road Tunnel”, it can be judged that the K44 + 858 m of the right tunnel belongs to the extremely high-stress area. According to the Russenes criterion, it can be judged that the surrounding rock at K44 + 858 m of the right tunnel belongs to medium rockburst.
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