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利用GDS动三轴仪,在应变控制条件下,对压实桂林典型红粘土进行固结不排水振动三轴试验。主要考虑了固结围压、固结应力比、压实密度和初始应变对红粘土动剪切模量和阻尼比的影响并分析其规律特性。结果显示:动剪切模量随振动应变的增大而减小,而随固结围压、固结应力比和压实密度的增大而增大;动剪切模量比随振动应变、固结围压和固结应力比的增大而减小,随压实密度的增大而增大;阻尼比是随振动应变、固结围压和固结应力比的增大而增大,在不同的振动应变幅值下表现不同大小。可用Hardin-Dmevich双曲线模型对动剪切应力和动剪切模量比进行很好的拟合。所得结果可为工程建设和场地地震反应分析提供一定的参考。
Using GDS dynamic triaxial apparatus, under the condition of strain control, the consolidated undrained vibration triaxial test of compacted Guilin typical red clay was carried out. The effects of consolidation confining pressure, consolidation stress ratio, compaction density and initial strain on dynamic shear modulus and damping ratio of red clay are mainly considered and their regular characteristics are analyzed. The results show that the dynamic shear modulus decreases with the increase of vibration strain and increases with the increase of consolidation confining pressure, consolidation stress ratio and compaction density. The dynamic shear modulus ratio increases with the vibration strain, The consolidation confining pressure and the consolidation stress ratio increase and decrease, and increase with the compaction density; the damping ratio increases with the increase of vibration strain, consolidation confining pressure and consolidation stress ratio, In different vibration strain amplitude of different sizes. Hardin-Dmevich hyperbolic model can be used to fit the dynamic shear stress and dynamic shear modulus ratio well. The results can provide some reference for engineering construction and site seismic response analysis.