摘要
为研究软黏土路基在长期交通荷载下的变形特性,针对温州地区的路基软黏土开展了一系列部分排水循环动三轴加载试验,研究部分排水条件下正常固结软黏土的孔压及变形随循环加载次数的发展规律,重点分析循环动应力比对软黏土回弹模量以及轴向累积塑性应变的影响。以5%的轴向累积塑性应变作为温州软黏土在部分排水条件下的破坏标准,确定了其临界循环动应力比为0.275。通过进一步考虑循环动应力比的影响,采用对数型经验模型对轴向累积塑性应变进行预测并建立了拟合参数与循环动应力比之间的关系。
A series of partially drained cyclic triaxial tests were performed on typical Wenzhou soft clay to investigate the deformation characteristics of soft clay in subgrade under long-term traffic load. The development laws of pore pressure and deformation of the soft clay with the increase of the frequencies of loading cycle were analyzed,and special attention was paid on the dynamic modulus and accumulated plastic strain of soft clay under different cyclic stress ratios. Based on the suggested value of 5% axial cumulative plastic strain as the failure criterion of Wenzhou saturated soft clay under partially drained conditions,and the critical cyclic stress ratio was 0.275. Considering the effect of the cyclic stress ratios,a logarithmic empirical model was proposed to predict the accumulated plastic strain and the relationship between fitting parameters and cyclic stress ratios was established.
作者
孙磊
SUN Lei(School of Resources and Civil Engineering,Suzhou University,Suzhou 234000,China)
出处
《工业建筑》
CSCD
北大核心
2019年第6期111-116,共6页
Industrial Construction
基金
安徽省自然科学基金项目(1908085QE215)
安徽省高等学校省级质量工程项目(2017jyxm1286,201710379150)
宿州学院教授/博士项目(2016jb05)
关键词
部分排水
动三轴试验
临界循环动应力比
累积塑性应变
经验模型
partially drainage
dynamic triaxial test
critical cyclic stress ratio
accumulated plastic strain
empirical model
