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通过自制的人工降水仪器,在常德—吉首高速公路路面现场进行中央分隔带降雨试验。通过试验分析了中央分隔带填土的初始含水量和空隙率与排水情况之间的联系,即中央分隔带填土初始含水量和孔隙比越大水渗透的速度越快,横向排水管的出水时间越短。估算出中央分隔带的排水量与降水量的比值,以此来评估中央分隔带的排水能力与效率。阐述了该路段的中央分隔带在排水设计和施工方面存在的问题,并且提出改善中央分隔带排水的建议:(1)在横向排水管埋设的位置设计小窨井,以便于清理,并保证横向排水管的排水能力;(2)可将中央分隔带汇水直接排入人孔,在每个人孔处须预埋管径能满足流量要求的横向排水管;(3)改变中央分隔带内渗沟集水井尺寸,增大集水井的汇水能力,并及时将集水井中的水排出路基外。
Through self-made artificial precipitation equipment, the Changde-Jishou Expressway pavement scene with the central divide zone rainfall test. The relationship between the initial water content and the voidage and the drainage condition of the filling of the central divider was analyzed through experiments. The greater the initial water content and the larger the void ratio, the faster the infiltration rate of the water in the horizontal divider, The shorter the time The ratio of displacement to precipitation for the central divider was estimated to assess the drainage capacity and efficiency of the central divider. The problems in the drainage design and construction of the central divider of the road section are expounded and suggestions for improving the drainage of the central divider zone are put forward: (1) Design small silos in the position where the horizontal drainage pipe is laid for easy cleanup and horizontal draining Drainage capacity of the pipe; (2) the central divider belt can be directly drained into manholes, and a horizontal drain pipe with a pipe diameter to meet the flow requirements shall be embedded at each manhole; (3) The size of the well increases the catchment capacity of the catchment well and discharges the water in the catchment well out of the embankment in time.