3. The retaining mechanism of composite nails and the relationship between the parameters of soil and pile and the composite nails was analyzed in this thesis. The analysis shows that the modulus of soil and Poisson ratio greatly affect the Soil Nailed Retaining Structure and that the depth and width of mixed-in-place pile both have critical values.
3. Simulate the composite foundation by altering parameters of pile and soil, analyses the effect of bearing capacity and settlement of composite foundation by altering the parameters of pile、 soil and the interface.