Analysis And Calculation On Reliability Of Gravity Retaining Wall Of Railway Subgrade

With the further reform of design specifications using reliability method in our country and the further research on reliability method in geotechnical engineering, it is imperative for gravity retaining wall structure, which is a one of better important structure of subgrade, to design with the reliability method of retaining structures. The analyses or discussions are emphasis on the following contents.(1) The random variables in reliability design of retaining wall ware discussed. These random variables include the unit weight of soil, internal friction angle of soil, angle of wall friction , base coefficient of friction and bearing capacity of foundation soil. It has also been discussed that the calculation of reliability index and its uses in retaining wall design.(2) Functions of limited state equation of anti-slide, antioverturning and earth pressure in retaining wall are established. The formula and program ( "M-C" Method) for reliability index calculation is obtained.(3) For the retaining wall designed by certainty method, the reliability index of anti-slide , anti-overturning of gravity retaining wall and stability of bearing capacity of foundation soil are calculated and analyzed. The factors that influence the reliability index of retaining wall, such as base friction coefficient and inclined base, are discussed. The objective reliability index of anti-slide , anti-overturning of retaining wall and stability of bearing capacity of foundation soil have been obtained.(4) Discussing on the method of establishing the partial coefficient of limit state design has been presented in the thesis. through calculating of variety of gravity retaining walls, resistance and load partial coefficient have been obtained and design expression of gravity retaining wall on reliability have been established.(5) Based on design expression of gravity retaining wall in the thesis, sensibility of design expression have been analyzed through change of soil parameter,then some general blueprints of railway design department have been calculated and its conclusion is that the design expression can apply to design of gravity retaining wall. Lastly, summarization of reliability analysis of gravity retaining wall has been presented.