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.