【摘要】 为了解决华北平原地区高速公路采用低路堤时所面临的下穿道路排水问题,结合河北省大广高速公路衡大段实体工程,针对华北平原地区地下水位低、地层土壤渗透性好、雨量小且集中、饮用水井深的特征,对典型土质进行了渗透试验,研究了集水净化渗滤系统排水的设计;根据不同区域的实际情况,分别提出了集水井加横向排水管加渗透池、集水井加横向排水管加封底的沉淀池加小渗井、集水井加横向排水管加不封底的渗透池加小渗井3种设计方案,并将这3种排水净化渗滤方案实施于实体工程。结果表明:集水净化渗滤系统排水方案一方面可解决低路堤设计理念下高速公路下穿道路的排水问题,另一方面可使路基平均填土高度降低1.5 m左右,节省了造价,减少了对生态环境的影响。更多还原

【Abstract】 In order to solve the channel drainage question of low embankment for highway in North China Plain,combined with the entity project of Hengda section at the Daguang Expressway in Hebei Province,aimed at the characteristic of climate,geology,hydrology and low water table,good permeability stratum soil and its little and mass rainfall and deep drinking water well in the areas of North China Plain under design of the low embankment of Hengda Expressway,authors carried out the permeability test of typical soil,and studied the drainage design of the catchment filtration purification system,i.e.according to practical states of different regions,three drainage plans were got respectively: the first is water-collecting well-transverse drainage pipe-filter pool;the second is water-collecting well-transverse drainage pipe-sedimentation tank with back cover-small seepage well,the third is water-collecting well-transverse drainage pipe-sedimentation tank without back cover-small seepage well.Three plans were practiced in the entity project.Results show that on the one hand,catchment filtration purification system can solve the highway drainage problems caused by the low embankment;on the other hand,it can reduce the filling height of the embankment about 1.5 m,and can save the cost of the project.It also can reduce the negative impact on the ecological environment.更多还原