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为研究鄂西北地区片岩变形参数的各向异性及水敏性,对十堰—房县高速通省隧道片岩开展片理面倾角为0°,45°,90°的天然及饱和状态下单轴压缩试验。结果表明:片岩变形参数的各向异性及水敏性特征十分明显,相同含水状态时片岩弹性模量由大到小分别为:90°>0°>45°,天然试样泊松比由大到小分别为:45°>0°>90°,饱和试样泊松比v由大到小分别为:90°>0°>45°;片理面倾角相同时,天然试样弹性模量均大于饱和试样,泊松比随试样含水状态的变化与片理面倾角有关,片理面倾角为0°时,天然状态泊松比等于饱和状态,片理面倾角为45°时,天然状态泊松比大于饱和状态,片理面倾角为90°时,天然状态泊松比小于饱和状态;片理面倾角为0°时主要发生垂直片理面方向的剪断破坏,45°时多沿片理面发生纯剪切破坏,90°时主要发生沿轴向的劈裂破坏。片理面倾角与含水状态对片岩变形参数及破坏形式影响显著的主要原因是:片理面法线方向与轴向力方向的不同组合情况,导致软弱结构面–片理面对片岩变形的贡献程度不同。研究结果可为类似片岩地区隧道设计、开挖、支护及防水处理等提供参考。
In order to study the anisotropy and water sensitivity of the deformation parameters of schist in the northwestern Hubei Province, the uniaxial compressions of natural and saturated states of slab face at 0 °, 45 ° and 90 ° were carried out in the tunnel of Shiyan-Fangxian Expressway. test. The results show that the anisotropy and water sensitivity of the deformation parameters of schist are very obvious. The elastic modulus of schist from the maximum to the minimum is 90 °> 0 °> 45 °, respectively. The Poisson’s ratio To 45 °> 0 °> 90 ° respectively, the Poisson’s ratio v of the saturated sample is respectively: 90 °> 0 °> 45 °. When the same slab faces have the same inclination angle, the natural modulus of elasticity The results show that the Poisson’s ratio is related to the apparent facetting angle with the change of the water content of the sample. When the face slanting angle is 0 °, the Poisson ratio of the natural state is equal to the saturated state, and the face slanting angle is 45 °. The natural Poisson’s ratio is larger than the saturated state, and the Poisson’s ratio in the natural state is less than the saturated state when the face loft angle is 90 °. The shear failure in the vertical face plane occurs mainly when the face loft angle is 0 °. Pure shearing damage occurred along the veneer surface, mainly occurred along the axial splitting failure at 90 °. The main reason that the influence of facet angle and water content on the deformation parameters and failure mode of schist is significant is that the combination of the normal direction and the axial force direction of the facets leads to the contribution of weak structural plane to the deformation of schist Different degrees. The results can provide reference for similar tunnel design, excavation, support and waterproofing in the area of schist.