中文摘要：

为了解亭子口水利枢纽坝基泥质粉砂岩流变规律,采用RLW-2000三轴流变仪对泥质粉砂岩进行三轴压缩流变试验。试验结果表明：较低应力水平下,泥质粉砂岩轴向流变较侧向更为显著,随着应力水平升高,侧向流变发展迅速,试样破坏前侧向流变增幅为轴向的2倍左右。基于试验结果,得到流变速率与应力水平及围压的关系,分析流变破坏模式,掌握了泥质粉砂岩三轴流变基本力学特性。利用文献[6]中的非线性损伤流变模型进行流变力学参数辨识,并利用获得的流变力学参数模拟亭子口水利枢纽坝基蓄水后长期运营条件下的流变力学特性。

英文摘要：

In order to get the rheological law of muddy sihstone in the foundation of the dam for Tingzikou Water Control Project, a triaxial compressive rheological experiment is made on the muddy siltstone with RLW - 2000 Triaxial Rheometer. The result shows that the axial rheology of the muddy siltstone is more significant than its lateral rheology along with the increase of the stress level, while the lateral rheology develops rapidly and its increment is to be about two times of the axial one before the failure of the sample. Based on the rheological experiment result, the relationship between both the rheological rate and the stress level and the confining pressure, and then the rheological failure mode is analyzed and the basic triaxial rheological and mechanical properties of the muddy siltstone are obtained as well. With the nonlinear damage rheological model given in the literature [ 6 ], the rheological and mechanical parameters are identified, furthermore, the rheological and mechanical properties of the foundation for the dam of Tingzikou Water Control Project under the long-term operation after the water impoundment are simulated with the rheological and mechanical parameters obtained.