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在本项研究中,调查了伺服试验机应用于蠕变试验时的控制性能。首先,假设一个线性岩石模型,从而验证、得到机械—岩石系统的特征方程式,并发现在一次和二次蠕变阶段,系统是稳定的,但在三次蠕变域系统是不稳定的。其次,因作者最近提出的非线性粘弹性模型,对三次蠕变域进行了计算机模拟实验。模拟实验结果总结如下: 1) 控制性能主要受实验的固有频率、伺服系统的放大和液压缸的控制。 2) Ⅱ组岩石的重蠕变曲线较Ⅰ组岩石的全蠕变曲线更易获得。最后,用稻田花岗岩、三城目安山岩和河津凝灰岩作为岩石样品,在单轴压缩条件下进行了蠕变实验。从而发现模拟实验结果与该实验结果是一致的。
In this study, the control performance of a servo tester applied to a creep test was investigated. First, assuming a linear rock model, the characteristic equations of the mechanical-rock system are verified and obtained, and it is found that the system is stable in the first and second creep stages, but is unstable in the three-time creep system. Secondly, due to the nonlinear viscoelastic model recently proposed by the author, a computer simulation experiment was performed on the three creep domains. The simulation results are summarized as follows: 1) The control performance is mainly affected by the natural frequency of the experiment, the amplification of the servo system and the control of the hydraulic cylinder. 2) The heavy creep curve of Group II rock is more easily obtained than the whole creep curve of Group I rock. Finally, creep experiments were performed under uniaxial compression conditions using paddy field granite, Sanchengmu Andesite and Hejin tuff. It was found that the simulation results are consistent with the experimental results.