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结构面对隧道围岩变形及稳定性起着决定性作用。运用三维离散元方法(3DEC)研究结构面分布特征,重点是结构面线密度1/λ、强度和倾角对隧道围岩变形的影响,总结了结构面分布与围岩变形特征的关系。结果表明,在结构面强度较低的情况下,结构面线密度对隧道变形的影响较大,其影响可分为两种情况:①λ≤0.2时,围岩的弯曲变形大于沿结构面的剪切变形,属于应力型大变形;②0.2<λ≤0.4时,沿结构面的剪切变形大于围岩的弯曲变形,属于结构型大变形。结构面倾角主要影响围岩大变形发生的位置。将数值模拟结果与国内工程实例实测变形资料相对比,发现一致性较好。本研究结果对隧道支护结构的设计以及施工设计具有借鉴意义与指导作用。
The structure faces the deformation and stability of tunnel surrounding rock plays a decisive role. The 3DEC is used to study the distribution characteristics of the structural plane. The emphasis is on the influence of the linear density 1 / λ, the strength and the dip on the deformation of the surrounding rock. The relationship between the structural plane distribution and the deformation characteristics of the surrounding rock is summarized. The results show that under the condition of low strength of the structural plane, the influence of the linear density of the structural plane on the deformation of the tunnel is large. The influence can be divided into two situations: ① When λ≤0.2, the bending deformation of the surrounding rock is larger than that of the shear along the structural plane Shear deformation, belongs to the large deformation of stress; ② When 0.2 <λ ≤ 0.4, the shear deformation along the structural plane is larger than the bending deformation of the surrounding rock, which belongs to the structural large deformation. Structural inclination mainly affects the location of large deformation of surrounding rock. The numerical simulation results compared with the measured deformation data of domestic engineering examples, found that the consistency is better. The results of this study have reference and guidance to the design of tunnel supporting structure and construction design.