交通土建毕业论文（Graduation thesis of traffic construction）.docVIP

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交通土建毕业论文（Graduation thesis of traffic construction）.doc

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交通土建毕业论文（Graduation thesis of traffic construction）

交通土建毕业论文（Graduation thesis of traffic construction） The first chapter is introduction. 1.1 INTRODUCTION 50 years ago, Chinas highway construction has made great achievements. Reviewing the development course of our countrys highway and comparing the development trend of the world highway, we can think that the highway traffic of our country is in the period of rapid development of expanding scale and improving quality. However, as the foundation is very weak, Chinas highway construction can not meet the needs of the national economy and social development on the whole, and there is still a big gap compared with the advanced level of developed countries. From the level of road, the total road mileage and nearly 200 thousand kilometers of roads and roads of the proportion of the total road mileage reached 14.4, the western region is higher, reaching 21.8%, the technical level which is not ideal. From the administrative division of distribution, due to the economic development and population distribution is not balanced, the highway development there is a big gap between the regions, in the overall, the highway density in eastern area is larger, higher proportion of high grade highway, significantly higher than the national average, higher than the level in the Western region. Therefore, to gradually achieve the overall strategic goal of Chinas modernization of transport, in accordance with the use of road function and traffic demand, focus on improving the level of highway technology economic relatively developed area, according to the countrys western development strategy, vigorously support the highway infrastructure in West Shi Jianshe, will be the end of this century and the strategic focus of the beginning of the next century in China development of highway transportation. Since.E. Sutherland 1.2 DICAD PRO technology since 1963 the Massachusetts Institute of Technology proposed the concept of interactive graphics technology in his doctoral dissertation, CAD Compu