Study On Integrated Drainage In Road Reconstruction And Extension Widening

The rapid growth of our state transportation requires that both superior performance and traffic should be improved constantly, but because of lack of pavement structural design and inaccurate traffic forecasts in the past, most new roads occured structural damage or saturated traffic in the initial period of roads, and have been unable to meet the requirements of vehicles. Accordingly, it is one of urgent problems that how to widen and rehabilitate roads in order to meet the demands of vehicles and the traffic, which is necessary for socio-economic development. The problem of drainage in the process of road widening and rehabilitating, based on the road widening project of Zhengzhou-Iuohe sections in Jingzhu highway. The main content of this project is that the effect of different drainage Items are simulated by the numerical method, and drainage Items are optimized by the results of numerical simulation, finally finding the best solution for this project.The paper proposes various drainage options about subsurface drainage of roads, whice base on the drainage system design for new roads, and opions are optimized by the results numerical simulation with SEEP/W.Under the circumstances, which there is lack of drainage system in the central reserve, The paper study the central reserve drainage system and propose many different options about it, at the same time, the paper contrast drainage effect of various drainage options by the numerical simulation software SEEP/W, and recommend the best Item.In this paper, influence factors of permeable base on the subsurface drainage system are analysed by the software DRIP deeply, and the thickness and drainage pipes spacing of permeable base for various drainage options to be used in the Item are recommend, depending on the calculated results by DRIP.Combining with the research results of subsurface drainage system and central reserve drainage system, the paper recommend comprehensive drainage system fitted for different sections in the widening and simulated the effect of comprehensive drainage system by SEEP/W.