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利用MTS岩石力学试验机,得到了干燥和受压力水作用的碳质页岩的三轴流变试验曲线,对比分析了干燥页岩和受压力水作用页岩的流变特征的异同;在此基础上,由受压力水作用页岩的流变特征,构建了六元件线性黏弹塑性流变模型,得到压力水作用下页岩的本构方程和蠕变方程,并利用流变试验结果求解了模型的流变参数。试验结果表明压力水降低了页岩的屈服强度,加剧了页岩的流变特征。流变模型与试验结果对比显示,所建线性模型能够较好的描述受压力水作用页岩的减速蠕变和等速蠕变阶段,可用来研究承压水作用下防水煤岩柱的流变性质和长期稳定性。
The MTS rock mechanics testing machine was used to get the triaxial rheological test curves of carbonaceous shale under dry and pressured water, and the similarities and differences of the rheological characteristics of shale from dry shale and pressurized water were compared. Based on the rheological characteristics of the shale under pressured water, a six-element linear viscoelasto-plastic rheological model was constructed, and the constitutive equation and creep equation of the shale under pressure were obtained. The rheological test results were used to solve the equations The rheological parameters of the model. Test results show that pressure water reduces the yield strength of shale, aggravating the rheological characteristics of shale. The comparison between the rheological model and the experimental results shows that the linear model can describe the slow creep and constant velocity creep phases of shale under pressure water effectively and can be used to study the rheology of water-proof coal pillar under the action of confined water Nature and long-term stability.