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根据单轴卸载试验,获得岩样相应的应力应变曲线和轴向应变-径向应变曲线,并得到不同程度的损伤岩样。与完整的峰前曲线相比较,推断不同损伤程度岩样的卸载点所处于的应力应变曲线的阶段。将损伤岩样和破坏形成的岩块浇注在混凝土中,通过剪切试验获得岩石的抗剪强度。剪切试验结果显示,在裂纹稳定发展阶段卸载,岩样的抗剪强度下降很小,可能强度的变化掩藏在个体差异中;在裂纹不稳定发展阶段卸载,岩样的抗剪强度明显下降,特别是卸载点靠近强度峰值时;单轴压缩破坏形成的岩块仍具有相当可观的材料强度。
According to the uniaxial unloading test, the corresponding stress-strain curves and axial strain-radial strain curves of rock samples were obtained, and the rock samples with different degrees of damage were obtained. Compared with the complete pre-peak curve, the stress-strain curve of the unloading point of different damage levels is deduced. Will damage the rock samples and damage the formation of rock pouring in the concrete, through the shear test to obtain the rock shear strength. The results of shear tests show that the shear strength of rock samples decreases little during unloading at stable crack growth stage, and the change of strength may be hidden in individual differences. The shear strength of rock samples decreases obviously during unloading at crack instability stage, Especially when the unloading point is close to the peak intensity; rock blocks formed by uniaxial compression failure still have considerable material strength.