Study On Stability And Comprehensive Protection Of Freeway Bridge Soil Conical Slope

In the process of China's modernization construction, transportation infrastructure has been developing in recent years. By early 2010, our freeway total mileage up to 6.5 million kilometers, ranking second in the world after the United States. In highway construction, the side slope protection problem is becoming more and more serious, as the weakest link, the bridge conical slope is often neglected easily, additionally the protection cone slope has itself difficulties, which leads to the bridge slope diseases particularly prominent, and these diseases are caused by technical personnel lack the bridge protection design and construction of knowledge and can not enough to ensure construction quality strictly.Cone slope is to protect roadbed slope from flush, between bridge and roadbed construction cone-shaped structure. Also calls the cone protection slope, when the bridgehead is buried type, pile type, pillar type abutment or it cannot fully retaining soil, for protecting the stability of roadbed to Set cone both sides. Transverse direction of the slope should be consistent with the embankment slope, along the bridge it should be based on the slope height, soil conditions, according to flooding situation to decide.Common diseases such as cone slope collapse, crack, local fall off, etc. Especially in flood season, often due to local disease, cause the whole slope all washed out, even washed out the bridgehead roadbed, interrupt traffic; Moreover, because the bridge cone slope of destruction, abutment bare outer, bridgehead roadbed under impact loading of cars pushes it, no slope protection to balance the part pressure, abutment and sidewalls occurs frequently break. This paper studies it the purpose and significance is also based on it from the design and construction discusses some improvements, which in transportation infrastructure can reduce this aspect disease, so as to ensure the stable, durable cone slope play their due function, maximum narrowing the maintenance cost, improve social economic benefits.This article came from the reality production construction actual existence problem, for the question collected related aspects domestic and foreign data, summarized and researched engineering construction bridge cone slope diseases to present the reason, the mechanism. Through the analysis and study found out a set of new method, new material, new measures from design to construction to solve, improvement and reduce such engineering diseases. This paper based on the analysis of the cone slope linear shape, has obtained the relevant principles, first to ensure its stability; Secondly, it joins subgrade to abutment slipped slope smoothly, so as to achieve stability and beautiful requirements. According to analysis for the actual situation of the bridge project, believe that the elliptical cone is more appropriate in the mathematical surface, circular cone slope is only a special case of elliptical cone slope.by theoretical calculation of the second chapter, obtained oblique coordinate system the analytical equation under a variety of oblique cone abutment base surface curve, and derived polar coordinates equation and the corresponding analytical solutions, this for lofting the coordinates of the construction and computer program to provide the theoretical basis; and to discuss the max gradient of slope, finds the position of the steep slope, and gives numerical integration formula for the engineering amount of cone slope.The third chapter developed computer program on the lofting points coordinates of cone slope and the engineering amounts of cone slope, by CAD programming language "AUTOLISP", in AutoCAD platform IDE integrated development environment, according to the simple known conditions, through programs computer can be easily solved for design and construction lofting, this provide the maximum convenience. Then there was a stability analysis on soil cone slope by large-scale general finite element software ANSYS, the solpe is a limit cases of codes. It carries on the numerical simulation for 3d model of the slope and studies the cone slope stability of limit cases, this chapter analysis verify the conical slope in the regulations permit the largest gradient, had large slope safety factor.Finally, this paper has discussed from the construction method and cone slope filler, analysed bridge cone slope plant protection and engineering protection, derived soil slope comprehensive protection scheme. A comprehensive solution in the economic benefits and social benefits, environmental benefits has great superiority. All sorts of ideal filler compaction result are analyzed, provides several new compacted method; And how to fully compaction the filler.