Analysis And Design Of Prestressed Anchor Retaining Structures

There are many kinds of forms of supporting structure, the costs of traditional supporting methods such as gravity retaining wall, counterweight retaining wall, cantilever retaining wall, buttressed retaining wall and lump stone are relatively high and the area of plough occupied is large, and the technology is infeasible when the retaining wall is high. With the increase of speed of fundamental construction of our country, it is necessary for us to study the theory of supporting structure in detail in order to obtain rational forms of that, which is not only of important theoretical meaning, but also of great reality meaning.Frame supporting structure with pre-stressed anchor bar is a kind of light supporting structure emerging in recent years. Based on the characteristics of collapsible loess in northwest region, the frame supporting structure with pre-stressed anchor bar is analyzed in this paper.In the previous calculation of soil pressure of earth-retaining structure, the Coulomb's or Rankine's theory of soil pressure is often adopted, which is demonstrated unadvisable by many engineering projects. The calculating model of soil pressure of anchor bar supporting structure commended by the code named "technical code for building slope engineering" is reasonably chosen.In addition, the calculating elements and the calculating model of vertical column, horizontal beam and retaining plate of frame are proposed in this paper, the solving method of anchor supporting reaction is given out, at the same time, the expressions of analysis of structural stability and embedment depth design of foundation are deduced, and the program of the design and calculation of frame supporting structure with pre-stressed anchor bar is written with the language MATLAB too. If we know the relevant design parameters and soil parameters, using this program can obtain the sectional dimensions and reinforcement of frame, the diameters and lengths of anchors, and the embedded depth of foundation directly. To use it conveniently, we can formulate the design and calculation tables considering many combinations of work conditions under different situations for the frame supporting structure with pre-stressed anchor bar, which are very convenient to engineering designers.To check the rationality and correctness of the above program, a project example is introduced. The comparison between the results of program design and those of practical design indicates that the calculating model is rational, the design methods are simple and utility, and the program is feasible, which can play a certain role for the later practices. The analysis calculation and research thoughtfulness used in this paper can be extended and applied to other regions with different soil features and other forms of supporting structure.