Large Deformation Spatiotemporal Evolution Law and Support Effect Evaluation of a Deep Buried Steep Inclined Thin Layered Small-angle Tunnel
In order to explore the spatiotemporal evolution law of the large deformation of a deep-buried steeply inclined thin-layer small-angle tunnel,and to evaluate the effect of different support methods on inhibiting the large deformation of the surrounding rock,four test sections with different support modes were set up for the first and second level large deformation tunnel sections of the tunnel,and seven measuring points were set up at the vault and side wall of each support test section for long-term monitoring of cross-section convergence de-formation.The deformation monitoring results show that the convergence deformation of the tunnel side wall position in different tunnel sections is large.The exponential function was used to fit the deformation evolution monitoring results,and the values of deformation fitting parameters a and b at different positions of the section under different support conditions were analyzed.Finally,the aging deformation characteristics of different po-sitions of the section and the effects of different support modes were quantitatively analyzed by fitting the pa-rameter values.The results of this study have certain enlightening significance for the understanding of the de-formation and failure mechanism and support methods of layered surrounding rock in deep high-stress tun-nels[1].
High crustal stress tunnelAsymmetric failureTime-dependent large deformationSupport testSpatiotemporal evolution
万方数据
维普
