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通过预制张开节理类岩石试件,在单轴压缩条件下,研究节理密度及倾角的组合作用对试件强度和变形特征的影响.试验结果表明:(1)随着节理倾角的增大,应力-应变曲线由多峰值转变为单峰值,试件脆性增强,延性减弱;(2)节理密度对当量峰值强度的影响与节理倾角大小有关,对当量弹模的影响呈“V”形变化,即当量弹模随着节理密度的增大呈现先减小后增大的变化规律;(3)当量弹模随节理倾角的增大而增大,在节理倾角为90°的时候达到最大值,为完整试件弹性模量的70%~80%;(4)节理倾角对多节理类岩石试件当量峰值强度和当量弹性模量的影响大于节理密度的影响.对试验结果进一步分析发现:节理密度及节理倾角与应力-应变曲线、当量峰值强度及当量弹性模量之间的关系,其变化规律与试件的破坏过程息息相关,其破坏模式可分为张拉破坏、剪切破坏和复合破坏.
The effect of the combined effect of joint density and dip angle on the strength and deformation characteristics of the specimens was studied by prestressing the specimen of the open-planted rock specimen under uniaxial compression. The experimental results show that: (1) With the increase of the joint inclination, The stress-strain curve changes from multi-peak to single-peak, and the brittleness increases and the ductility decreases. (2) The influence of joint density on equivalent peak strength is related to the size of joint inclination, and the effect on equivalent modulus is “V” (3) The equivalent elastic modulus increases with the increase of joint inclination and reaches the maximum at the joint inclination of 90 ° (4) The effect of joint inclination on the equivalent peak strength and equivalent elastic modulus of multi-joint rock specimens is greater than that of joint density.Further analysis of the test results : The relationship between the joint density, the joint inclination and the stress-strain curve, the equivalent peak strength and the equivalent elastic modulus are closely related to the failure process of specimens. The failure modes can be divided into tensile failure, shear failure and Compound destruction.