砂土与水泥浆体剪切特试验研究.doc

学号： 常 州 大 学 毕业设计（论文） （ 2013 届） 题 目 砂性土与水泥浆体剪切特性试验研究 学 生 王莹 学 院 怀德学院 专业班级 土木091 校内指导教师 夏雄 专业技术职务 副教授 校外指导老师 蔡云 专业技术职务 总工程师 二○桩-土接触面力学特性的研究是解决桩-土相互作用问题的前提,尤其对于摩擦型桩而言,桩-土接触面问题直接影响到桩基的承载力Study of shear properties of sand -cement slurry interface by shear experimental study Abstract：The pile is all important foundation form，and it is extensively used in railways，roads，bridges，ports and high一rise buildings．The interface mechanical properties between pile and soil are the prerequisite for the pile-soil interaction problem.According to the properties of Changzhou region, considering the mechanical properties of body is pressed into the sand,experiments by using laboratory shear tests are performed on sand concrete interfaces with three kinds of sand density，where five normal stresses are taken into account in each sand density in this paper.The experimental data show that density of sand and water cement ratio play an important role in mechanism behavior of pile—soil interface．While density of sand is fixed，,with higher water cement ratio ,shearing strength, friction angle of the interface all decrease monotonously and nonlinearly,but cohesion force of the interface increase．While water cement ratio is fixed，with higher density of sand,shearing strength, friction angle of the interface all decrease monotonously and nonlinearly,but cohesion force of the interface increase．The initial piece of stress—strain curve of interfabe is not sensitive to density of sand. This experimentaI results put the good foundation for relative engineering numerical simulation． Key words：interface, shear properties , experimental study , sand , cement slurry , 摘要·········································