Abstract：The traditional stability calculation theory and support structure design methods of deep buried tunnels are not suitable for the significant challenges posed by large deformations of soft rock under complex geological conditions. There is an urgent need for breakthroughs in this field. Firstly，the instability mechanism of squeezed large deformation tunnels and the interaction mechanism between surrounding rock and support structures are elucidated. Based on the elastoplastic theory，the stress at the elastic-plastic interface of the surrounding rock and the plastic zone radius of the rock are determined to establish the scope of stability analysis for the surrounding rock. Based on the energy method，the surrounding rock in the plastic zone and support structure are regarded as independent structures. The stress and deformation continuity conditions at the rock-support interface are introduced，and total energy equations for the stability analysis of the surrounding rock and the support structure are separately established. The stationary principle of potential energy and Rayleigh-Ritz method are used for analytical calculations to obtain the stability curve of the surrounding rock and the characteristic curve of the support structure. The rationality of the support structure is analyzed and evaluated by the graphic method. The influence of related parameters of the surrounding rock and the support structure and seismic forces on stability is investigated. The accuracy and practicality of the proposed method are verified through practical engineering applications. Finally，the frontier problems in further research are prospected. The results show that a deep buried tunnel convergence constraint design method based on structural stability theory is proposed，which conforms to NATM principles, modern tunnel engineering concepts and instability mechanism. This method achieves deformation control design. When the initial ground stress is 40 MPa，the contribution of the surrounding rock support is 91.4%，indicating that the surrounding rock is the main supporting force to maintain the stability of the tunnel. The elastic modulus of surrounding rock，internal friction angle, the strength of rock bolting，and seismic stress have significant effects on the stability of deep buried tunnels. Combined with the support structure design analysis of Muzhailing tunnel, the convergence constraint design method proposed is proved to have good engineering applicability. The research findings provide a new perspective for the design of support structures for deep buried tunnels.
张向民. 基于结构稳定理论的深埋隧道收敛约束设计方法研究[J]. 岩石力学与工程学报, 2024, 43(8): 1998-2012.
ZHANG Xiangmin. Research of convergence-confinement design method for deep buried tunnels based on structural stability theory. , 2024, 43(8): 1998-2012.
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2024, Vol. 43 
