考虑围压影响下的层状岩体压缩特性

Compressive Characteristic of Stratified Rock Mass Under Three Dimensional Stresses

为了研究围压作用情况下的层状岩体压缩特性,采用数值方法建立分析模型,计算不同围压下岩体的应力和应变后发现,随着结构面倾角的增大,层状岩体的抗压强度呈现先减小后增大的趋势;结构面倾角为60°时试件的三轴抗压强度最小;层面倾角为90°时对应的三轴抗压强度最大;对于相同倾角的试件,三轴压缩强度与围压呈显著的线性关系。数值试验反应的岩石应力-应变曲线与试验得到的结果相符,随着围压的增大,试样的刚度不断增大,弹性模量与围压之间呈线性关系。

For the compressive strength of stratified rock mass with sun＇ounding stresses, an analysis model is estalished through numerical methods, and the stress and strain for rock mass with different surrounding stresses are calculated. The results show that, with the increase of bedding plane inclination angle, the compressive strength varies in a manner of first decreasing then increasing; the compressive strength of rock mass reaches its minimum value when the bedding plane inclination angle 13 is equal to 60°; while it reaches its maximum value when the bedding plane inclination angle is equal to 90°; with the same 13, the tri-axial compressive strength and the surrounding stress of rock sample have a linear relationship. The stress-strain curves obtained from the numerical tests agree with those of the real test; with the increase of the surrounding stress, the stiffness of rock mass increases gradually; elastic modulus and surrounding stress have a linear relationship.