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本文对在单轴压力下岩石经历稳定破裂过程所需的条件、时间因素的影响形式和实质、变形速率的变化范围及变形参量的选取等问题作了研讨,并给出了刚性组件的设计条件。据此可以得出: (1)现行此类实验中选定某一变形速率后做出的应力应变全过程曲线不能全面地反映出岩石在该方面的力学性质,而应代之以C_0、C_m条件下的全过程曲线。本文给出了这个条件的定义。 (2)以试件纵向长度上的平均位移来作为控制参量有不合理之处,最好能以若干局部位移作为控制参量而进行实验。 (3)若以ε_x、ε_y而不是ε_z作为控制参量,当试件的μ(泊松比)不为常数时,按ε_x(或ε_y)等于常数加载,试件却并不处于常应变速率状态。在这种情况下,最好是以ε_z为控制参量。
In this paper, the conditions and time factors affecting the conditions for the stable rupture process of rock under uniaxial pressure, the influence of the time, the variation range of the deformation rate and the selection of deformation parameters are discussed. The design conditions of the rigid components are also given. . Based on this, it can be concluded that: (1) The current stress-strain curve made after selecting a certain deformation rate in such experiments cannot fully reflect the mechanical properties of rock in this respect, and should be replaced by C_0, C_m The whole process curve under conditions. This article gives the definition of this condition. (2) It is unreasonable to use the average displacement in the longitudinal length of the test piece as the control parameter, and it is better to carry out the experiment with some local displacement as the control parameter. (3) If ε_x and ε_y are used instead of ε_z as the control parameters, when the μ (Poisson’s ratio) of the specimen is not constant, the specimen is not at the constant strain rate if ε_x (or ε_y) is equal to constant loading. . In this case, it is better to use ε_z as the control parameter.