机场高填方地基引导式立体排水技术研究

Study on guided three-dimensional drainage technique for high fill foundation of airport

高填方机场的建设场地往往具有复杂的水文地质环境,解决好高填方地基冲沟底部多层次立体的排水问题,对机场保障长期的使用性能具有重大的现实意义。针对冲沟底部流水及两侧壁不同高度裂隙渗水,提出了引导式立体排水方法,并详细论述了高填方地基下引导式立体排水各工序(冲沟底部清理、碎石垫层铺设、构筑盲沟、回填土及铺设塑料排水板)的施工技术要点。排水效果和深层沉降监测两个方面的评价结果表明,引导式立体排水具有良好的排水效果,对高填方地基的长期使用性能起到了良好的保障作用,确保了机场的使用安全。

High fill airport is usually constructed in a complex hydrogeological environment. In order to maintain the extended functions of airport,the effective three-dimensional drainage technique for the gully bottom with high fill foundation is quite necessary. According to the situation of water in gully bottom and the crack seepage from different height of two side walls,the technique with the guided three-dimensional drainage is proposed,and the main technical requirements of the working procedure including the cleaning of gully bottom,the paving of gravel cushion,the construction of blind ditch,the soil backfill and the laying of plastic drainage board are elaborated. The drainage effect and the deep settlement monitoring results shows that the effect of the facilitated three-dimensional drainage is obvious,at the same time,the facilitated three-dimensional drainage could maintain the extended functions of airport.