文献类型：期刊文献

中文题名：冻融循环对滨海软土三轴应力应变曲线软化特性的影响

英文题名：Effect of freeze-thaw circles on softening behaviors of triaxial stress-strain curve of costal soft soils

作者：王伟[1];池旭超[1,2];张芳[1];孙斌祥[1]

机构：[1]绍兴文理学院工学院;[2]墨尔本大学墨尔本设计学院

年份：2013

卷号：0

期号：S2

起止页码：140

中文期刊名：岩土工程学报

外文期刊名：Chinese Journal of Geotechnical Engineering

收录：CSTPCD、、北大核心2011、EI(收录号：20140117166013)、Scopus(收录号：2-s2.0-84891335461)、北大核心、CSCD、CSCD2013_2014

基金：国家自然科学基金项目(41202222);教育部科学技术研究重点项目(211068);住房与城乡建设部研究开发项目(2012-k3-4);浙江省科技厅公益性技术应用研究计划(2012C23063);中科院冻土工程国家重点实验室开放基金项目(SKLFSE200603);绍兴市公益性技术应用研究计划(2012B70022)

语种：中文

中文关键词：软土;冻融循环;三轴试验;应力应变;软化特性

外文关键词：soft soil;;freeze thaw cycle;;triaxial compressive test;;stress-strain;;softening behavior

中文摘要：为研究冻融前后滨海软土应力应变特性的变化,对不同冻融循环作用后的原状滨海软土进行了三轴试验。试验围压设为400 kPa,考虑了6个不同的冻融循环次数。引入应力相对软化系数对冻融循环后滨海软土的结构性变化进行了初步分析。实验结果表明:①随着冻融循环次数的增加,滨海软土的破坏应力逐渐减小,5次冻融后的破坏应力约为其原始破坏应力的42%;②冻融循环次数的增加使滨海软土的软化特性逐渐降低,甚至消失,5次冻融后的应力相对软化系数逐渐趋于零。提出了冻融循环作用下软土的应力应变软化模型。最后,结合试验数据,给出了模型参数的确定方法,并通过曲线拟合对比证明了该方法的准确性。

外文摘要：In order to understand the variation of mechanical behaviors of soft soils caused by the freeze-thaw circle(FTC), triaxial compressive tests on soft soils after different FTCs are conducted. Six FTC times are designed ranged from zero to seven, and the confining pressure is designed as constant 400 kPa. The relative softening factor is defined as the parameter to discuss the FTC-dependent structural properties of soft soils. The test data show that(1) the failure stress of soft soils decreases nonlinearly with bigger FTC, and its value after fifth FTC becomes about 42% of its original value without any freeze-thaw experience;(2) the softening behaviors of soft soils become weaker and weaker, almost disappear with the relative softening factor tending to be zero after fifth FTC. Consequently, a mathematical model is proposed in order to describe FTC-dependent stress-strain curve, and the relevant method to determine its parameters is presented according to the test data. Finally, good agreements are found between the test data and the simulated results of the proposed model.