【摘要】 介绍了复合材料土钉的特点:高比强、可设计性、廉价性、环保性等,并制作了直径为21mm的杆体,进行了抗拉试验,总结了拉挤杆体的一些特性;并用有限元对钢筋土钉、复合材料土钉和预应力复合材料土钉3种支护基坑的变形与破坏进行了对比分析,结果表明:(1)复合材料支护基坑的变形与钢筋土钉、预应力复合材料土钉支护基坑的变形区别很大;(2)在深度小于10m的基坑,预应力复合材料土钉与钢筋土钉支护基坑的变形接近。(3)3种支护方式的基坑沉降位移的区别不大。更多还原

【Abstract】 Composite material soil-nail,a new kind of bar made of fiberglass and epoxy resin,is used as substitute for general steel soil-nail in foundation pit supporting.It shows a variety of properties: high strength,flexibility of designing,cheapness and environmental protection.Samples with a diameter of 21 mm are made;and tension tests are carried out with these samples.Some important characters are observed from the tension tests.The finite element method is then used to analyze and contrast the deformation and failure of foundation pits supported separately by general steel soil-nail,composite material soil-nail and prestressed composite material soil-nail.Three results are revealed:(1) Difference is obvious among the deformation of pits supported by composite material soil-nail,general steel soil-nail and prestressed composite material soil-nail;(2) The deformation of pit supported by prestressed composite material soil-nail is near to the deformation of the pit supported by general steel soil-nail when depth of pit is 10 m or less;(3) The settlement have no much difference when the pits are supported separately by composite material soil-nail,general steel soil-nail and prestressed composite material soil-nail.更多还原