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岩石的流变力学特性是影响水电坝基稳定性的重要因素,而流变长期强度是评价坝基岩体长期稳定性的重要指标。根据大岗山水电站坝基辉绿岩的三轴流变试验结果,分别用等时应力–应变曲线簇法、非稳定蠕变判别法、流变体积应变法和加卸载流变残余应变法进行了硬脆性辉绿岩流变长期强度的分析。结果表明:对于完整辉绿岩的长期强度,4种方法得出的结果较为一致;而对于含裂隙辉绿岩,流变体积应变法得出的结果与实际情况更为相符。通过对破裂辉绿岩的电镜扫描观察,发现辉绿岩的长期宏观强度主要取决于岩体内部矿物颗粒镶嵌组合的牢固程度及矿物之间的胶结程度。
The rheological mechanical properties of rocks are important factors that affect the stability of hydroelectric dam foundation. Long-term rheological strength is an important index to evaluate the long-term stability of rock mass. According to the triaxial rheological test results of the diabase in the dam foundation of Dagangshan Hydropower Station, the isochronous stress-strain curve method, the non-steady creep discrimination method, the rheological volumetric strain method and the unloading rheological residual strain method Analysis of long - term rheological rheology of hard brittle diabase. The results show that the results obtained by the four methods are consistent for the long-term strength of the intact diabase, while the results obtained by the rheological volume strain method are more consistent with the actual situation for the diabase containing fractures. Through the scanning electron microscope observation of the ruptured diabase, we found that the long-term macroscopic intensity of diabase mainly depends on the firmness of mineral particles inlaid assemblage and the degree of cementation between minerals.