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以西部强震区某土石坝工程为研究对象,采用室内动三轴试验,对其坝壳料、心墙料和坝基断层料进行动力特性研究,并以Hardin-Drnevich模型为基础,确定筑坝材料的动弹模、阻尼比等特性参数。试验表明:动应变在10-6~10-5范围内,动模量与围压、固结比成正相关,随动模量的增大,相关性降低;动应变和振级的拟合指数模型则表明不同围压、固结比情况下心墙料的应变-振级曲线趋势一致,坝壳料较为离散;试验中固结围压对粗骨料阻尼比-应变曲线的影响较固结比大。土石坝筑坝材料的动力特性是进行坝工设计和动力评价的基础,试验可为强震区土石坝的动力稳定评价提供可靠的理论依据。
Based on the Hardin-Drnevich model, the dam foundation material, core wall material and the dam foundation are studied for the dynamic behavior of a dam with earth-rock dam project in the western region of strong earthquakes by dynamic triaxial test. Material dynamic modulus, damping ratio and other parameters. The experimental results show that the dynamic strain is in the range of 10-6 ~ 10-5, and the dynamic modulus is positively correlated with the confining pressure and consolidation ratio. The higher the follow-up modulus is, the lower the correlation is. The fitting index of dynamic strain and vibration level The model shows that the trend of strain-vibration curve of core wall material under different confining pressure and consolidation ratio is consistent and the dam shell material is more discrete. The influence of consolidation confining pressure on the damping ratio-strain curve of coarse aggregate is more stable than the consolidation ratio Big. The dynamic characteristics of embankment dam materials are the basis for dam design and dynamic evaluation. The test can provide a reliable theoretical basis for the dynamic stability evaluation of earth-rock dam in strong earthquakes.