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对岩样在常规三轴压缩下应力应变曲线特别是峰后强度变化曲线进行深入分析,通过分段函数和双曲函数建立峰后强度参数随软化参数变化的规律,给出了花岗岩常规三轴状态下峰后应力应变关系式的具体求法,并发现岩石粘聚力和摩擦角可用岩石峰值强度和残余强度结合破坏角近似描述,因此,提出一种较简便的计算岩石黏聚力和摩擦角的近似方法。对多组花岗岩试样进行三轴压缩试验,利用不同围压下应力应变曲线,求得内摩擦角φ和黏聚力c,将后者结果与前者对比可知:(1)该函数可近似的描述岩石峰后的应力应变关系和软化规律;(2)在围压的许可范围内,利用花岗岩三轴压缩强度峰后曲线求得的粘聚力和摩擦角可作为岩石的抗剪强度参数的近似值。上述方法可在一定程度上反映岩石力学三轴试验中常出现剪切破坏的物理意义,并对实际工程和试验提供借鉴。
The stress-strain curves, especially the post-peak strength curves of the rock samples under conventional triaxial compression are analyzed in depth. The regularity of the post-peak strength parameters with the softening parameters is established by the piecewise and hyperbolic functions. And find out that the cohesion and friction angle of rock can be described by the combination of rock peak strength and residual strength in combination with the failure angle. Therefore, a simple method to calculate rock cohesion and friction angle The approximate method. Three groups of granite samples were tested for triaxial compression. The stress-strain curve under different confining pressure was used to obtain the internal friction angle φ and the cohesion c. The comparison between the latter and the former shows that: (1) (2) The cohesion and friction angle obtained from the post-peak curve of granite triaxial compressive strength can be used as the parameters of shear strength of rock in the permissible range of confining pressure approximation. The above method can reflect the physical meaning of shear failure often occurring in triaxial tests of rock mechanics to a certain extent and provide references for practical engineering and experiment.