【正文】
concrete contents of the design are as follows : Following the procedures of preliminary design , bine the topography、geology condition , select the basic trend of the line on the topographic map of belt contour , and start the subgrade design,including level location、level section design、profile design、cross section design、subgrade cubic meter of earth and stone calculation program and design、level coordinate calculation program of line and design、translating a relevant foreign technological the course of level location, follow the gradient changes to locate the line。pays attention to the tight slope land sector and the gentle slope land sector decides the line request and decides the line skill, in design process between, because two stands has a bigger elevation difference, therefore in order to reduce the volume of excavation the quantity and strives for the maximum elevation, the line uses an greater slope uphill, and the attention causes the straight line and the curveinter coordination, the full consideration clamps the straight line to be gentle and the length of curve request。In profile design , we must pay attention to the maximum grade、the connection of grade section and pensation of gradient etc。On the grade change point, we should dispose the vertical curve the course of level coordinate calculation program and design, pare thee two methods and use the C Language to program。In the cross section design, consider the problems of broadening subgrade on curve whole design is divided into several stages to stage requires integrated consideration and careful essential parison and checkout both are required to do before and after the design conforms to the standard, submit relevant achievements of design, and then finish the designKey Words:Level section、Profile、Vertical curve、Subgrade、Cross Section2