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为研究单节理岩体抗压强度随节理面倾角及围压变化时的变化规律,利用数值模拟软件UDEC对围压一定时不同节理面倾角的岩体进行了抗压强度实验.结果表明:围压一定,随节理面倾角的增大,岩体抗压强度先减小后增大,在倾角介于45°~60°时抗压强度达到最低值,呈典型的“U”形趋势;节理面倾角一定,随着围压的增大岩体抗压强度也随之增大,整体呈线性变化趋势,可拟合为一次函数,与理论导出式一致;随节理面倾角增大岩体抗压强度增大幅度呈先减小后增大趋势,近似于围压一定时岩体抗压强度随节理面倾角变化规律.
In order to study the variation law of the compressive strength of single jointed rock mass with the change of confining pressure and confining pressure, the compressive strength of rock mass with different confining pressures was measured by numerical simulation software UDEC. The results show that: The compressive strength of the rock mass first decreases and then increases with the increase of the inclination of the joint plane. The compressive strength reaches the lowest value when the dip angle is between 45 ° and 60 °, showing a typical “U” shape trend ; With a certain inclination angle of jointed surface, the compressive strength of rock mass increases with the increase of confining pressure and linearly changes as a whole, which can be fitted as a linear function, which is consistent with the theoretical derivation. With the increase of confining pressure, The increase of bulk compressive strength first decreases and then increases, which is similar to the regularity of compressive strength of rock mass with the inclination of knuckle when the confining pressure is constant.