不同固结程度海洋软土动强度试验研究

Experimental Study on Dynamic Strength of Marine Soft Soil with Different Consolidation Degree

摘要: 为研究循环应力比和频率对不同超固结比的海洋软土动强度的影响，本文对珠江海洋软土进行室内动三轴试验，并对试验结果进行拟合分析。试验结果表明：总应变随着频率和超固结比的增大而减小，随着循环应力比的增大而增大；软化指数随着振次、循环荷载的增大而减小，随着频率的增大而增大；对软化曲线和动强度曲线进行回归分析，分别得到关于超固结比的软化系数和动强度经验公式。

Abstract: In order to clarify the effects of cyclic stress ratio and frequency on dynamic strength of soft ma-rine soil, a series of dynamic triaxial tests are performed. The test results show that: 1) the total strain decreases along with the increase of the frequency and over-consolidation ratio, but in-creases along with the increase of the cyclic stress ratio; 2) the softening index decreases along with the increase of vibration times and cyclic loading, but increases along with the increase of the frequency; 3) by conducting regression analysis on the softening curve and dynamic strength curve, we have obtained the softening coefficient on over-consolidation ratio and the empirical equation of dynamic strength.