Abstract

To experimentally investigate the effect of frequency on the cyclic behavior of marine soft clay under different consolidated stress paths, a series of cyclic tests on remolded Wenzhou marine clay were conducted under undrained conditions covering various frequencies and consolidated stress paths using a triaxial apparatus. The development of pore water pressure, stress–strain relationship, and resilient modulus was analyzed. Several useful conclusions were reached from this study. First, the trends of pore water pressure development can be divided into three stages: linearly increasing, slowly increasing, and stable. Second, the frequency has a more pronounced influence on the number of cycles of the steady value of pore water pressure than the counterparts of values of the ratio of the radial to vertical consolidation stresses, K. Then, a unified linear equation was established based on the consideration of different K values on a logarithmic scale. Finally, the shapes of the stress–resilient strain hysteretic loops and the range encompassed by the stress–resilient strain hysteretic loops are slight as the value of K decreases, which indicates that the K value has a slight effect on the shift in the type of elastic behavior of clay.

摘要

为了实验研究频率对不同固结应力路径下海相软粘土循环行为的影响，使用三轴仪在不排水条件下对重塑的温州海相粘土进行了一系列包含不同频率和固结应力路径的循环试验。分析了孔隙水压力、应力-应变关系和弹性模量的发展。这项研究得出了几个有用的结论。首先，孔隙水压力的发展趋势可分为线性增加、缓慢增加和稳定三个阶段。其次，频率对孔隙水压力稳定值循环次数的影响比对径向固结应力与垂直固结应力之比值的影响更显着，克。然后，基于对数尺度上不同K值的考虑，建立了统一的线性方程。最后，随着K值的减小，应力-回弹应变滞回环的形状和应力-回弹应变滞回回线所包含的范围都变小了，这表明K值对类型的转变有轻微的影响。粘土的弹性行为。