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裂隙岩体在渗流水荷载作用下的裂隙围岩流-固耦合研究是隧道工程研究的热点问题,而计及中间主应力影响的隧道围岩流-固耦合应力计算鲜见介绍。采用双剪统一强度理论屈服模型,计及中间主应力影响,分析了在渗流水荷载作用下隧道围岩处于弹性、软化、塑性流动时的流-固耦合问题,并给出了含水围岩、衬砌应力、位移与变形区界面半径解析计算式。其结果对水底隧道围岩稳定分析与衬砌结构设计计算具有工程实用意义。
The study of fluid-solid coupling of fractured surrounding rock under the action of seepage water load is a hot issue in tunnel engineering. However, the calculation of fluid-solid coupling stress of surrounding rock considering the influence of intermediate principal stress is scarcely introduced. The double-shear unified strength theoretical yield model is used to calculate the influence of intermediate principal stress. The fluid-solid coupling problem of surrounding rock of tunnel under elastic, softening and plastic flow under seepage water load is analyzed. Calculation formula of interface radius of lining stress, displacement and deformation zone. The results have practical significance for the stability analysis of underwater tunnel surrounding rock and design and calculation of lining structure.