论文部分内容阅读
在大型动力三轴仪上进行了坝料的动力变形特性试验研究,分析了围压和固结比对最大动模量、动模量衰减规律和阻尼比的影响。试验研究表明:随围压和固结应力比的提高,最大动模量增大;随应变的增大,动模量逐渐衰减;固结比对最大阻尼比影响不大,随固结比的提高最大阻尼比略有降低。基于沈珠江动力变形特性模型,提出了可以将固结比影响归一化的最大动模量和模量衰减的修正公式,该公式能很好地消除围压和固结比对模量衰减规律的影响。结合其它工程试验成果,通过小于5 mm粒径颗粒含量初步探讨了尺寸效应对动力变形特性的影响,研究表明室内试验得出的最大动模量较工程原位土体的要低,而最大阻尼比要略高。
The dynamic deformation characteristics of dam materials were studied on a large power triaxial apparatus. The effects of confining pressure and consolidation ratio on the maximum dynamic modulus, dynamic attenuation law and damping ratio were analyzed. Experimental results show that with the increase of confining pressure and consolidation stress ratio, the maximum dynamic modulus increases. With the increase of strain, the dynamic modulus decays gradually. The consolidation ratio has little effect on the maximum damping ratio. With the consolidation ratio Increase the maximum damping ratio slightly lower. Based on the model of Shenzhujiang dynamic deformation, a modified formula of maximum dynamic modulus and modulus attenuation, which can normalize the effect of consolidation ratio, is proposed. This formula can well eliminate the law of modulus decay of confining pressure and consolidation ratio Impact. Combined with the results of other engineering tests, the influence of size effect on dynamic deformation characteristics was discussed through the particle size of less than 5 mm. The results show that the maximum dynamic modulus obtained by laboratory test is lower than that of engineering soil, while the maximum damping Better than slightly higher.