循环荷载下天津吹填土动应力应变关系研究

Experimental study on dynamic stress-strain relation of reclaimed soil in Tianjin subjected to cyclic loads

通过对天津滨海吹填土开展的循环荷载下的室内动三轴试验,研究了振动频率、固结比、动应力幅值的大小、静偏应力、循环振次等因素对动应力—应变关系的影响,试验结果表明,天津滨海吹填土存在临界循环应力比,且与固结围压成线性关系,以临界动应力作为归一化因子,建立了考虑固结围压与循环振次的动应力—应变关系曲线方程。

Through the dynamic triaxial tests of reclaimed soil in Binhai of Tianjin under the cyclic loads to investigate the influence factors of the dynamic stress-strain, the influence of vibration frequency, consolidation ratio, dynamic stress, static deviator stress, cycle numbers are taken into account. The test results show that there is the critical dynamic stress ratio of the soil and it has a linear relationship with the confining stress. A new curve equation of dynamic stress-strain which considers the confining stress and cycle numbers is developed taking the critical dynamic stress as the normalization factor.