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为探讨软岩蠕变过程中稳定性及反馈特性的对应关系,建立了软岩全程应力应变率曲线,并用微分方程进行描述;进一步讨论了改进西原正夫体模型中粘性系数变化对系统稳定性的影响,分析软岩蠕变过程中稳定性及反馈特性.结果表明:软岩试件的蠕变曲线与蠕变过程的三个阶段能够较好的对应,改进的西原正夫模型能够较好的反应软岩蠕变的全过程;在蠕变过程中,在载荷或应力的作用下(输入),系统会产生位移或应变(输出);输出的位移或应变会导致阻尼力发生变化,进而使得非线性广义粘性系数发生改变,非线性广义粘性系数的变化又影响蠕变位移.阻尼力(非线性广义粘性系数)与蠕变位移之间相互影响,两者组成一个简单的反馈系统.
In order to explore the relationship between the stability and the feedback characteristics in the process of soft rock creep, the stress-strain rate curve of soft rock is set up and described by the differential equation. The effects of the change of viscous coefficient on the stability of the system , The stability and feedback characteristics of soft rock in creep process are analyzed.The results show that the creep curves of soft rock samples can correspond well to the three stages of creep process and the improved Nishihara model can respond well The entire process of soft rock creep; in the process of creep, the system will produce displacement or strain (output) under load or stress (input); the output displacement or strain will cause the damping force to change, The linear generalized viscous coefficient changes, and the change of nonlinear generalized viscous coefficient also affects the creep displacement.The interaction between damping force (nonlinear generalized viscous coefficient) and creep displacement, both form a simple feedback system.