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分级加卸载条件下岩石的弹塑性流变特性

     

摘要

Physical and mechanical properties of the rock in Sanchahe Mine were determined through electro hydraulic servo controlled rock testing machine ( RMT - 150C) ; A series of rock creep tests were carried out on rock shear rheological tester ( RYL - 600) through the way of hierarchical loading and unloading; The elastic - viscous - viscoelastic properties of rock in the area were found and the rheological model was identified after analyzing the test data. The results showed that it had the similar rheological properties as burgers model; Therefore, researches on rheological properties of the rock around the burgers model were carried out. The parameters of the burgers model under different stress levels were obtained. The rheological theory curves were fitted using burgers equation. The theoretical curve and the actual test data coincides well. It shows that burgers model can reflect the creep characteristics of the rock in Sanchahe Mine well.%利用RMT-150C微机控制电液伺服岩石力学试验机测定了三岔河矿区顶板粉砂岩的各项物理力学指标;采用分级加卸载的方式在RYL-600岩石剪切流变试验仪上进行了一系列的岩石流变试验;分析试验数据,发现该区岩石具有弹性一粘性一粘弹性的流变特性,总结岩石流变特性,对其流变模型进行辨识,发现岩石的流变特性与伯格斯模型性质很相似;利用伯格斯模型对该区岩石的流变特性展开研究,求取了不同应力水平下伯格斯流变模型各项参数,利用伯格斯方程拟合得出岩石的流变理论曲线,理论曲线和实际试验数据吻合较好,说明伯格斯模型能较好地反映三岔河矿区顶板粉砂岩的流变特性.

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