Joint Optimization Design Method For The Flat And The Vertical Section Of The Railway Line Partial Program

Under the "expanding domestic demand and maintain growth" policies, China continues to increase the strength of railway construction.In November2008China medium and long-term railway network plan (revised in2008) approved by the national. By2020, China will build about40,000km railway, the total scale of investment in railway construction will exceed5trillion yuan, the railway mileage will reach more than120,000kilometers, the double-track rates and electricity rates will reach50%and60%, in the main busy railway line passenger trains and freight trains will drive on the different track. Basically form reasonable layout, clear structure, function perfect, smoothly linking railway network. Transportation capacity can meet the requirement which national economic and social development need, the main technical equipment will reach or approach international advanced level. The medium and long term railway network plan clearly put forward that mainly expand the scale of west rail network, construct the skeleton of western railway network, improve the railway network structure in the eastern and central, improve the transportation capacity which adapt to regional economic development, about41000km new railway will be constructed. Many planning western railway, such as:Dong-Ge(Donghuang to Geermu), Ku-Ge(Kuerle to Geermu), La-Ri(Lasa to Rikaze), due to special geographical location, more requirements in survey and design have been proposed on new railway. Require us possible adoption new technologies, new methods, new equipment in many aspects of design and construction to complete assignments efficiently and accurately. In complex and dangerous areas railway line design process, determining railway line specific location generally based on the known positions of big bridges and long tunnels, completed by the cooperation between many professional. In this case, flat and longitudinal joint optimization design method is more emphasized in railway line design process to obtain an economic and rational design Program.In the issue of flat and longitudinal joint optimization design method many research has been made by domestic and foreign experts, they use many method in the area, such as:the enumeration method, dynamic programming, linear programming, numerical search method, genetic algorithm, ant colony algorithm and dimensionality reduction method, made a series of results. Most of these methods are based on the digital terrain model, take fill and excavated volume on the line as the objective function, search optimum program. In the western region because the complex terrain and geological conditions, a slight change on the curve radius will have an enormous impact on quantities. Therefore, researching a line coordinates accurate calculation method which can suitable for complex and dangerous areas, designing a method which based on digital terrain models and can interpolation each point on the line, interpolation the elevation of each point on the line in the case of known the line plat position, optimizing the line longitudinal, calculating the corresponding engineering quantities, looking for an optimum program which minimum the number of engineering quantities by constantly adjust line flat and longitudinal program is particularly necessary.This article combined with the actual needs of the western railway construction, mainly carry out research work for the following aspects:(1) Design circuit pile coordinates calculation method and procedures, this method can be applied for the straight-gentle-Circle-gentle-straight five-stage point-by-point coordinate precision calculations, preparation for the corresponding procedures to implement the design algorithm.(2) Based on available information, designing a point-by-point interpolation method which based on the contour digital terrain models. According to mass data access features on railway line digital terrain model, using the original contour digital terrain model shape grid nets model, design a method can quickly locate interpolation points in which grid nets, find out all the terrain points in or near the grid nets in which interpolation points exist, find out six points which least nearest to interpolation point, using the weighted average horizontal mobile fitting calculation of several neighboring points calculate the elevation of each point. Import flat coordinate points in the design line, we can quickly obtain the ground elevation of design line per hundred meters piles, generate the ground line.(3)Take the generated ground line as reference, considering the specific requirements, such as:least slope length, maximum slope, maximum slope poor and so on, the basic idea is dimensionality reduction method, design longitudinal automatically calculation slopes program. After completed slopes calculation, inspect the slopes reduction of curve, bridge, tunnel, station location. Automatically generate the initial longitudinal by the program design method.(4) Combined with the line cross-sectional design standard icons, design a procedure which can calculate new railway sub-grade engineering quantities, calculate earthwork under different options as the main basis of selected line program.(5) Through specific examples of projects, using the above algorithm and procedure realize the process of line partial program selection. Verify the rationality and feasibility of the program design.The thesis generally takes the contour digital terrain model as the initial information, takes curve radius as variable, research partial circuit longitudinal automatically optimize method by automatically calculation slopes and engineering quantities in different radius. Effectively, accurately, quickly complete partial circuit program selection. Make the design more economical, objective, have certain value in complex and dangerous area partial circuit program selection.