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在实验室里进行了环向有效约束条件下的破裂岩体承载变形试验,分析了破裂岩体承载过程中的变形特性.结果表明,随环向约束力和轴向应力状态的提高,破裂岩体的体积应变由初始破裂后的膨胀转化为压密,岩石的再破坏导致轴向应力出现较大幅度的起落;当环向约束力趋于稳定后,轴向应变和环向应变均显著增长,破裂岩体的体积应变又由压密状态逐步又转化至体积膨胀,而轴向应力逐步维持在一个稳定的应力状态;破裂岩体的再破坏不会导致最终极限承载能力的降低和变形量的显著增加.
In the laboratory, the bearing deformation test of the ruptured rock mass under the circumferentially effective constraint condition was carried out and the deformation characteristics during the bearing process of the ruptured rock mass were analyzed. The results show that with the increase of the circumferential restraining force and the axial stress state, The volumetric strain of the body is transformed from the initial rupture to the compaction, and the re-rupture of the rock leads to a considerable rise and fall of the axial stress. When the circumferential restraint tends to be stable, both the axial strain and the circumferential strain increase significantly , The volumetric strain of the ruptured rock mass gradually transforms from compactness to volume expansion, while the axial stress gradually maintains a stable stress state. The re-failure of the ruptured rock mass will not lead to the decrease of the ultimate ultimate bearing capacity and the deformation A significant increase.