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通过三轴卸荷试验,系统分析了卸荷速率对卸荷过程中岩石力学特性的影响,研究了岩体的应力应变特征、卸载变形特征和破环特征,得到卸荷速率与变形模量及峰值围压的关系。结果表明,当卸荷速率小于0.02 MPa/s时,卸荷破坏变形模量随卸荷速率的增大呈非线性增长,破坏时的围压随卸荷速率增加呈非线性递减;当卸荷速率大于0.02 MPa/s时,变形模量呈线性增长,破坏时围压呈线性递减,但当卸荷速率增大到一定值时,变形模量将趋于稳定;不同卸荷速率与峰值围压的二次多项式拟合,相关系数都在0.90左右,说明采用二次多项式进行拟合是可行的。
Through the uniaxial unloading test, the influence of unloading rate on rock mechanics characteristics during unloading is systematically analyzed. The stress-strain characteristics, unloading deformation characteristics and breaking characteristics of rock mass are studied. The unloading rate and deformation modulus and Peak confining pressure relationship. The results show that when the unloading rate is less than 0.02 MPa / s, the deformation modulus of unloading failure increases nonlinearly with the increase of unloading rate, and the confining pressure decreases nonlinearly with the unloading rate increasing. When the rate is more than 0.02 MPa / s, the deformation modulus increases linearly and the confining pressure decreases linearly. However, when the unloading rate increases to a certain value, the deformation modulus tends to be stable. The different unloading rates and peak values Pressure quadratic polynomial fitting, the correlation coefficient of about 0.90, indicating that the use of quadratic polynomial fitting is feasible.