考虑温度影响的饱和软黏土应变软化研究

发布时间：2018-10-05 19:11

【摘要】：循环荷载作用下饱和软黏土将产生应变软化现象,通过对宁波饱和软黏土开展温控动三轴试验,研究了温度、频率、初始偏应力、动应力和含水率对土体应变软化的影响,并在试验基础上建立了一个能够考虑温度影响的应变软化模型。结果表明:随着振动次数、初始偏应力、动应力和含水率的增加,土体软化加快,软化指数逐渐减小;随着频率和温度的提高,土体软化程度降低,软化指数增大;建立的软化模型可以较为合理地描述试验温度、频率、初始偏应力、动应力和含水率对土体应变软化特性的影响。
[Abstract]:Strain softening will occur in saturated soft clay under cyclic loading. The effects of temperature, frequency, initial deflection stress, dynamic stress and moisture content on strain softening of saturated soft clay in Ningbo are studied by temperature controlled triaxial test. On the basis of the experiment, a strain softening model which can take into account the influence of temperature is established. The results show that with the increase of vibration frequency, initial deflection stress, dynamic stress and moisture content, soil softening accelerates and the softening index decreases gradually, and with the increase of frequency and temperature, the softening degree decreases and the softening index increases. The softening model can reasonably describe the effects of temperature, frequency, initial deflection stress, dynamic stress and moisture content on the strain softening characteristics of soil.
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