渗透排水技术在大广高速公路衡大段建设中的应用研究

The Penetration Drainage Technology in the Construction of Hengda Section in Daguang Highway Project

近年来我国高速公路建设飞速发展，建设用地供需矛盾十分突出。为此，大广高速公路衡大段在设计时提出了低路基设计理念，以达到节省土地资源、减少土方量和工程量的目的；下穿式被交道路的排水是制约低路基是否能够实现的关键技术问题。通过分析研究拟建高速公路段的水文地质条件及现场渗水试验成果，提出了低路基设计方案中渗透排水技术；使低路基在大广高速公路衡大段得以实现，为推广应用提供了技术支持。

The construction of the highway in China is developed rapidly in these years and the eontradietion between the building land supply and demand is extremely serious. Therefore, in the design of Hengda section in the Daguang highway it proposed the idea of low subgrade in order to save the land resource and reduce earth volume and the quantity. The Drainage in the expressways intersected with under-pass highways is the key technology problem to ensure the realization of the 10w subgrade. Through analyzing the hydrogeological conditions in this highway section and the result of penetration drainage experiments, it proposed the penetration drainage technology in the low subgrade design and realized the low subgrade in the Hengda section of the Daguang highway, which can provide technical support for the application of this technology.