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利用典型大理岩试件进行了加载条件下的系列三轴试验,计算了大理岩在加载条件下的力学与变形参数,研究了岩样加载下变形破坏及其能量特征。结果表明,在加载试验中,随初始围压的增加,抗剪断参数凝聚力值增长,内摩擦角值降低;岩样在加载过程中,随轴向应力的增大,泊松比不断提高,并在破坏时急剧增长,变形模量初始变化平缓,但在岩样加载屈服破坏点处陡降;围压对岩样的变形破坏具有约束作用,限制了岩石内部裂纹的扩展及发育。
A series of triaxial tests under typical loading conditions were carried out. The mechanical and deformation parameters of marble under loading conditions were calculated. The deformation and failure of the marble under loading and its energy characteristics were studied. The results show that with the increase of initial confining pressure, the value of cohesion increases with the increase of initial confining pressure and the internal friction angle decreases. With the increase of axial stress, the Poisson’s ratio increases with the increase of initial confining pressure In the case of rapid failure, the initial change of deformation modulus is gentle, but it drops sharply at the point of yield failure of rock specimen. The confining pressure has a restraining effect on the deformation and failure of the rock specimen, which limits the expansion and development of cracks in the rock.