不同条件下粉砂融土动力参数试验研究

Experimental study on dynamic parameters of silt melted soil under different conditions

研究不同条件下粉砂融土动模量和阻尼比等参数的变化规律。借助动三轴试验发现:相同动应变下,动应力与围压、初始含水率、振动频率和固结时间成正比,动应力和动应变非线性关系明显;随着围压增大,动模量增大,动模量比和阻尼比减小;随着初始含水率提高,动模量和动模量比增大,阻尼比减小;随着频率增大,小应变时动模量增大,阻尼比基本不变,大应变时动模量基本不变,阻尼比显著减小,频率对动模量比影响不大;随着固结时间增加,动模量和动模量比增大,阻尼比减小。

To study the variation of dynamic modulus and damping ratio of silt melted soil under different conditions,by means of dynamic triaxial test:under the same dynamic strain,the dynamic stress is proportional to the confining pressure,initial moisture content,vibration frequency and consolidation time,and the dynamic stress and dynamic strain are non-linear;with the increase of confining pressure,the dynamic modulus increases,the dynamic modulus ratio and the damping ratio decreases;with the increase of initial moisture content,the dynamic modulus ratio and the dynamic modulus ratio increases,and the damping ratio decreases;with the increase of frequency,while with small strain,the dynamic modulus increases and the damping ratio basically remains unchanged,while with large strain,the dynamic modulus basically remains unchanged,and the damping ratio decreases significantly,which frequency has little effect on the dynamic modulus ratio;with the increase of consolidation time,the dynamic modulus and dynamic modulus ratio increases and the damping ratio decreases.