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对不同膨胀状态下的膨胀岩进行无膨胀作用的剪切蠕变试验、膨胀与蠕变完全耦合的剪切蠕变试验、膨胀与蠕变不完全耦合的剪切蠕变试验、膨胀与蠕变分开耦合的剪切蠕变试验。得出如下试验结果:膨胀与蠕变耦合的剪切蠕变曲线与无膨胀作用的剪切蠕变曲线有相似规律性。膨胀和蠕变耦合方式对膨胀岩长期强度影响显著,具体表现为膨胀作用下的膨胀岩长期强度远小于无膨胀作用下的膨胀岩长期强度,膨胀与蠕变完全耦合下的膨胀岩长期强度低于膨胀与蠕变分开耦合下的膨胀岩长期强度。对于膨胀与蠕变完全耦合作用下的膨胀岩,求出了法向应力与长期强度拟合关系式;对于膨胀与蠕变分开耦合作用下的膨胀岩,求出了预加法向应力与长期强度拟合关系式。
Shear creep test of expanding rock under different expansion state without expansion, shear creep test of complete coupling of expansion and creep, shear creep test of incomplete coupling of expansion and creep, expansion and creep Separate coupled shear creep test. The following test results are obtained: the shear creep curves of expansion and creep coupling have similar regularities with the shear creep curves of no expansion. The expansive and creep coupling modes have a significant effect on the long-term strength of expansive rocks. The long-term strength of expansive rocks under expansive conditions is much smaller than that of expansive rocks without expansion. The long-term strength of expansive rocks under complete coupling of expansive and creep is low Long-term strength of expansive rocks under the coupled coupling of expansion and creep. For the expansive rock under full coupling of expansion and creep, the fitting relation between normal stress and long-term strength is obtained. For the expansive rock under the coupling effect of expansion and creep, the prestressed normal stress and long-term strength Fitting the relationship.