【摘要】 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.更多还原

【Abstract】 Loading and deformation experiments on cracked rock masses were performed in the laboratory.The stability and control of deformation in the rock surrounding deep-underground engineering structures were studied.The results show that as the stress in the cylindrical constraint and the axial stresses increase the volume strain becomes expansion rather than compression at the initial cracking site.Re-failure of the rock blocks in a cracked rock mass causes a great fluctuation in axial stress.When the stress in the cylindrical constraint becomes stable the axial stress and axial strain have both increased significantly: The volume strain of the cracked rock mass gradually changes from compression to expansion,too,but axial stress develops into a stable stress state.The re-failure of the cracked rock mass does not cause a marked decrease in the ultimate load-carrying limit nor a marked increase in the deformation of the cracked rock mass.更多还原