邯郸粉土动剪模量和阻尼比试验研究

Experimental study on dynamic shear modulus and damping ratio of silty sand in Handan

以邯郸地区的粉土为研究对象,在各种固结压力和相同加载周期及相同剪切应力幅值下,分别进行了室内动单剪试验,得到了该地区粉土在3种固结压力下的G/Gdmax-γ、D-γ归一化曲线以及G/Gdmax-γ和D-γ关系值。试验结果表明:G/Gdmax随动应变的增大而减小,随固结压力的增大而增大,而阻尼比D的变化规律与动剪切模量相反。所得结果可为本地区工程建筑的抗震设计提供参考。

Taking silty sand in Handan region as an object of study, the dynamic simple shear experiments indoors were performed under various consolidation pressure and same loading period and same shear stress amplitude. Through the experiments, the normalized G/Gmax-yand D - y curves and relationship values ofG/Gamax - y and D - y of silty sand in this area under three consolidation pressures were obtained The experimental results show that the value of G/Gamaxdeereases with increase of dynamic strain, and increases with increase of the consolidation pressure, and the change rule of damping ratio D is opposite to the dynamic shear modulus. The results obtained provide a reference to seismic design of the engineering construction in this region.