The Theory and Practice of Land Saving of Expressway Construction in China: A Case Study on Expressway of Kaifeng-Luoyang City

Taking the construction of Kaifeng-Luoyang Expressway as an example, this article expounds principles of land scarcity, management and restriction of constructive land, gross plowland homeostasis, and sustainable land use and management. In the course of survey and design, the design of the route, cross bridge and tunnel should be compared with the amount of plough of being used. The selection of source of earth and field are important processions in the saving and improving of land. Using coal-ash as road base and reducing thickness of clay coat can decrease ploughland occupation and pollution. We put forward three modes of earth taking which were applied in the dune hillock, alluvial plain and loess hill. The keys were discussed in the article that gathering earth combined land triming, exploiting and replowland with amending middle-low yield farmland. After research and practice, 683 ha of plow land about 52 percent of the whole land, was saved amended and exploited, This project showed very significant economical, social and ecological benefits.