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基于黏弹性理论,对土的动弹性模量和阻尼比确定方法进行探讨,并结合青藏铁路沿线黏土在一系列温度下的动三轴试验结果,给出冻结黏土的动弹性模量和阻尼比的确定方法.结果表明:冻结黏土的骨干曲线不是双曲线,建议通过滞回曲线求冻土的动弹性模量和动应变幅,从而获得它们之间的关系;不同计算方法得到的阻尼比随动应变幅的变化趋势基本相同,用滞后角法计算得到的阻尼比整体小于用能量损失法计算得到的阻尼比,建议采用相关函数法计算应变滞后于应力的滞后角,然后用滞后角法计算土的阻尼比;冻结黏土的阻尼比随动应变幅的增加而增大.
Based on the theory of viscoelasticity, the determination methods of dynamic elastic modulus and damping ratio of soil are discussed. Combined with the dynamic triaxial test results of clay along Qinghai-Tibet Railway at a series of temperatures, the dynamic elastic modulus and damping ratio of frozen clay are given. The results show that the backbone curve of frozen clay is not hyperbolic, and it is suggested that the dynamic elastic modulus and dynamic strain amplitude of frozen soil are obtained through the hysteresis curve, and the relationship between them is obtained. The damping ratio obtained with different calculation methods The trend of dynamic strain amplitude is basically the same. The damping ratio calculated by retarding angle method is smaller than the damping ratio calculated by energy loss method. It is suggested that the correlation function method be used to calculate the retardation angle of strain lag to stress. Then, Damping ratio of soil; the damping ratio of frozen clay increases with the increase of dynamic strain amplitude.