循环偏应力和循环围压耦合效应对饱和软黏土变形特性的影响

发布时间：2018-01-18 04:15

本文关键词：循环偏应力和循环围压耦合效应对饱和软黏土变形特性的影响　出处：《岩土工程学报》2015年12期 　论文类型：期刊论文

【摘要】：利用GDS变围压动三轴系统对温州地区典型饱和软黏土进行了一系列循环偏应力和循环围压耦合应力路径下的部分排水循环加载试验,重点分析了部分排水条件下循环偏应力和循环围压耦合效应对正常固结饱和软黏土变形特性的影响。试验结果表明:部分排水条件下,与围压保持恒定,偏应力单独循环剪切相比,循环偏应力和循环围压耦合剪切作用有效地促进了饱和软黏土的累积塑性应变的发展,循环围压和循环偏应力的比值每增加2/3,相应的永久轴向应变就增加32%。进一步根据部分排水条件下饱和软黏土永久轴向应变发展曲线特点,建立了考虑循环偏应力和循环围压耦合效应的正常固结饱和软黏土的永久轴向应变经验公式。
[Abstract]:A series of cyclic cyclic loading tests of saturated soft clay in Wenzhou area were carried out under cyclic deviant stress and cyclic confining pressure coupling stress path using GDS variable confining dynamic triaxial system. The effect of cyclic deflection stress and cyclic confining pressure coupling effect on the deformation characteristics of normal consolidated saturated soft clay under partial drainage condition is analyzed. The experimental results show that under partial drainage condition, the coupling effect is constant with confining pressure. Compared with cyclic shear alone, the coupling shear of cyclic stress and cyclic confining pressure can effectively promote the development of cumulative plastic strain of saturated soft clay, and the ratio of cyclic confining pressure to cyclic deflection stress increases by 2/3. The corresponding permanent axial strain increases by 32. Further, according to the characteristics of permanent axial strain development curve of saturated soft clay under partially drained conditions. An empirical formula for permanent axial strain of normally consolidated saturated soft clay considering cyclic stress and cyclic confining pressure coupling effect is established.
【作者单位】：浙江大学滨海和城市岩土工程研究中心;温州大学建筑工程学院;
【基金】：国家自然科学基金项目(51578426,51308420)
【分类号】：TU442
【正文快照】： 0引言随着中国经济的发展,沿海地区高速公路、高速铁路、城市地铁和飞机场建设高速发展,高速交通循环荷载长期作用引起的软基沉陷和结构破坏问题已日益突出。特别是像上海、温州等软土层很厚的城市。交通荷载引起的软土累积沉降控制问题也是造成高速公路和高速铁路投资成本高

【共引文献】