摘要
为研究冻融循环作用对聚丙烯纤维土抗剪强度的影响规律,采用了全组试验的方法,考虑了3个不同因素(冻结温度、含水率、冻融循环次数)对聚丙烯纤维加筋土的抗剪强度影响,并通过数据分析建立了不同影响因素对聚丙烯纤维土抗剪强度指标的拟合关系式。试验结果表明,在冻融循环作用下含水率对纤维土抗剪强度影响显著性最大,含水率越高,黏聚力和内摩擦角越小;冻融循环中冻结温度越低,内摩擦角越大,黏聚力越低;冻融次数对内摩擦角影响不显著。通过数据拟合,得到一个良好的拟合公式。
In order to study the influence of freeze-thaw cycles on the shear strength of polypropylene fiber soil,The paper adopts the method of whole group test,and the effects of three different factors( freezing temperature,water content,freezing and thawing cycles) on the shear strength of polypropylene fiber reinforced soil were considered. Moreover,the fitting formula of the shear strength index of polypropylene fiber soil was established by data analysis. The experimental results show that the effect of water content on the shear strength of the fiber soil is the most significant under the freezing-thawing cycle. The water content is higher,the cohesive force and the inner friction angle is smaller. The freezing temperature is lower in the freezing-thawing cycle,the internal friction angle is greater. The cohesive force is lower,and the effect of freezing and thawing times on the friction angle is less. A good fitting formula is obtained through data fitting,which can provide reference for subgrade soil construction in the later season frost zone.
出处
《施工技术》
CAS
2018年第S1期1125-1130,共6页
Construction Technology
基金
中央高校基本科研业务费专项资金项目资助(2572014CB21)
关键词
冻融循环
抗剪强度
聚丙烯纤维土
freeze-thaw cycles
shear strength
polypropylene fiber soil