摘要
交通荷载作用具有一定的阶段性,即日间车流集中,夜间车流较少。土体在经过一定次数的循环荷载作用后,其动力特性会发生改变。考虑到交通荷载的阶段性,研究对温州原状饱和软黏土在排水条件下进行阶段性循环加载试验,分析循环加载作用下和停振期对土样的动力特性影响。试验结果表明:在排水条件下,孔压呈现出由大到小的变化趋势;不同加载阶段下饱和软黏土应力-应变曲线和回弹应变的发展规律明显不同;在停振期累积应变与总累积应变的比值随阶段数和动应力的增加而减小。上述结论对于深入研究交通荷载作用下土体沉降发展具有一定的指导意义。
Traffic load has a staged characteristic, i. e. , the traffic flow is concentrated in day - time and very small in the night time. After a certain number of traffic loading, the dynamic characteristic of soil is changed. Consider- ing the staged characteristic of traffic loading, study conducts a series of staged cyclic loading tests on Wenzhou undisturbed soft clay. The influence of cyclic loading and non-cyclic loading is investigated. Tests results show that pore water pressure presents the trend period on the dynamic behavior of clay of increase at first and then decrease. The stress-strain relationship and development of resilient strain are obviously different under different stages. In the non-cyclic loading period, the ration between the incremental permanent strain and the total permanent strain de- creases with the increase of stage number and cyclic stress. These conclusions have certain guiding significance on deeply understanding the development of settlement of soft clay subgrade induced by traffic loadinz.
出处
《世界地震工程》
CSCD
北大核心
2017年第2期161-168,共8页
World Earthquake Engineering
基金
国家自然科学基金(41202186)
浙江省自然科学青年基金(LQ12E08007)
中国博士后基金(2015M571602)
关键词
排水
阶段性荷载
应力-应变滞回曲线
回弹特性
累积应变
drained condition
staged loading
stress-strain hysteresis loop
resilient behavior
accumulated strain
