交通荷载作用下结构性软土动应力C动应变关系试验的研究.pdfVIP

第 27 卷 增 1 岩石力学与工程学报 Vol.27 Supp.1 2008 年 6 月 Chinese Journal of Rock Mechanics and Engineering June ，2008 交通荷载作用下结构性软土动应力–动应变 关系试验研究 雷华阳，姜 岩，陆培毅，李志伟 (天津大学 土木工程系，天津 300072) 摘要：通过对天津滨海新区典型结构性软土进行室内循环三轴试验，研究在交通荷载长期作用下，结构性淤泥质 粉质黏土的动应变发展情况；考虑不同的振动波型、动应力频率、动应力比以及固结状态对动应力–动应变关系 的影响，得到淤泥质粉质黏土的临界动应力比和动应力–动应变关系随加载频率、围压及固结状态而变化的规律。 试验结果表明，结构性淤泥质粉质黏土存在一个临界动应力比和一个振动频率门槛值；同时，在半正弦波型条件 下动弹性模量和动剪切模量随固结压力值的变化存在一个转折点。 关键词：土力学；交通荷载；结构性软土；动三轴试验；动应力–动应变关系 中图分类号：TU 43 文献标识码：A 文章编号：1000 –6915(2008)增 1 –3052 –06 EXPERIMENTAL STUDY OF DYNAMIC STRESS-STRAIN RELATION OF STRUCTURAL SOFT SOIL UNDER TRAFFIC LOAD LEI Huayang ，JIANG Yan ，LU Peiyi ，LI Zhiwei (Department of Civil Engineering ，Tianjin University，Tianjin 300072，China) Abstract ：Through the dynamic triaxial tests of structural soft soils，the dynamic strain analysis is conducted on the silt soils under traffic load ，and the influence of vibration type，vibration frequency ，stress ratio，consolidation status of soils are taken into account. The variation rules of the critical dynamic stress ratio of the silt soils and dynamic stress-strain with vibration frequency，confining stress and consolidation status are obtained. Some conclusions can be drawn from the research ：(1) there is a critical dynamic stress ratio and a threshold of vibration frequency for structural silt soils under traffic load ；(2) there is a turning-point for the dynamic elastic modulus and dynamic shear strain of silt soil under half-sine wave condition. Key words ：soil mechanics；traffic load ；structural soft soil；dynamic triaxial test ；dynamic stress-strain relation