Reasonable Design And Structural Optimization Of Soil Nailing Applied In Slope In New Constructed Location For Emigrated People In The Three Gorges Reservoir Area

The soil nailing is widely applied in retaining slopes in new constructed location for emigrated people in the three gorges reservoir area due to its engineering advantage such as less construction time, economy, easily construction. And its logical design and optimized structure is very important for saving the emigrated people's money, quicken the building of the new city, keeping the long development of the new city.This paper carries out a entirely study and research on soil nailing as a slope retaining construction using limited equilibrium method, finite element method, soil pressure analysis method.Through analysis and compare, it is verified that the logarithm spiral line has more engineering advantage than the circle line as the supposed slide surface for a slope. So the author writes a Fortran language program for analyzing soil nailing using limited equilibrium method. With the help of this program, this paper does research on the moved backwards of the slide surface, lengthening the anchor section, the soil nail's total force, gets conclusion about relations between the soil nail's length and the slope's grade, height, soil's mechanical parameter; relations between soil nail's total force and Coulomb soil pressure. With the help of the large multiuse finite element program Ansys, this paper analyzes the soil nailing in one-step's slopes, in two-steps' slopes, puts the emphasis on the axis force's distributing along the soil nail at each rows, the effect of both the excavating mode and the original slope figure to the axis force of the soil nail, the one another effect between the upper-step slope and the nether-step slope in the soil nail's axis force, gets conclusion about the design of soil nail at the first low, different slope body is the same with different excavating mode, the original slope figure has more effect to some than others because of the slope body, the reasonably design of the step width in two-steps slopes, the two-steps excavating and retaining has more virtue than the one-step's. Through soil pressure analysis this paper does research on the differences and the links between the Coulomb soil pressure theory and the Rankin's, the vertical pressure at the slope surface when the slope surface is inclined and the retaining wall is rough, the soil pressure's distributing behind the panel, gets conclusion about the effect of both the slope body inner stability and the slope surface local stability to the soil pressureacting on the retaining structures, the exist of the unloading arch in soil behind the panel is availed to the panel's working in soil nailing.The conclusion gets in this paper basing on analysis will be useful in guiding the logical design and optimized structure about the soil nailing in future slope retaining in new constructed location for emigrated people in the three gorges reservoir area.