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通过建立可反映互层岩体中砂岩与板岩组成、岩层倾角、岩层走向等因素变化对岩体变形影响的互层岩体本构模型,研究了砂板互层岩体中隧道围岩的力学特性。研究结果表明:岩体中板岩体积含量越高,围岩最大变形及破坏范围越大,隧道周边围岩变形不对称性也越明显,板岩结构面的内摩擦角大小对岩体变形及破坏范围影响很大,板岩沿结构面破坏为砂板互层岩体的主要破坏形式之一;砂板互层岩体的倾角变化将影响隧道周边围岩变形的对称性及破坏区域的分布,倾角在40°～60°时,围岩变形的不对称性最明显,板岩含量较高时,砂板互层岩体的最大变形随倾角的增大而降低;岩层的走向与洞轴线交角越大,围岩变形越小,隧道周边围岩变形也越趋于对称,在陡倾砂板互层岩体中,洞轴线应尽可能沿与岩层走向大角度相交的方向布置以利于围岩的稳定;随着埋深的增加,围岩变形及破坏范围均增长,因岩层倾角、走向变化引起的隧道周边围岩变形不对称性也越明显。
Through the establishment of the constitutive model of the interbedded rock mass that can reflect the deformation of the rock mass due to the change of the composition of sandstone and slate in the interbedded rock mass, the change of the rock dip and the strike of the rock strata, the surrounding rock of the tunnel in the interbedded rock mass is studied. Mechanical properties. The results show that the higher the volume of slate in rock mass, the larger the deformation and failure range of surrounding rock, the more obvious the deformation asymmetry is. The internal friction angle of slate structure surface affects the deformation of rock mass, The damage range is greatly affected. The failure of slate along the structural plane is one of the main failure modes of interbedded rock mass. The change of dip angle of interbedded layered rock mass will affect the symmetry of surrounding rock deformation and the distribution of damaged area When the dip angle is between 40 ° and 60 °, the deformation asymmetry of the surrounding rock is the most obvious. When the slate content is high, the maximum deformation of interbedded rock mass decreases with the increase of dip angle. The larger the angle of intersection is, the smaller the deformation of the surrounding rock is. The deformation of the surrounding rock around the tunnel tends to be more symmetrical. In the intercalated rock of the steep sand plate, the axis of the cave should be arranged along the direction where the rock formation intersects at a large angle as much as possible The stability of rock is increased. With the increase of burial depth, the deformation and failure range of the surrounding rock are all increased. The deformation asymmetry of the surrounding rock around the tunnel is more obvious due to the change of rock dip and direction.