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处治前翻浆路段状况京古路(北京至古北口)怀柔县境北房村至驸马庄,约2公里,原有3.5公尺宽的砾石级配路面,厚20公分。该路段地势较低,边沟经常积水,每年春季四月份及秋季10月份是翻浆期,有时车辙深达40～50公分,严重地影响了运输。根据绸查,该路段地下水位距路基表面0.75公尺,路基土壤在1.2公尺深度内系粉砂土,1.2公尺以下是砂质土壤,平均冰冻深度约80公分,路基土壤含水量经常在14～16％以上,土质不好,水位高,这是构成这段道路翻浆的根本原因。
Condition before treatment Slough road Jingguk Road (Beijing to Gubeikou) Beifang Village, Huairou County, about 2 km, the original gravel gravel road 3.5 meters wide, 20 cm thick. The section of the road is low and the ditches are often filled with water. Each spring in April and the autumn of October is a turning-over period, sometimes reaching as deep as 40-50 cm, which seriously affects the transportation. According to Choucha, the groundwater level of the road section is 0.75m away from the surface of roadbed. The subgrade soil is silt sand within 1.2m depth, sandy soil below 1.2m, the average freezing depth is about 80cm. Subgrade soil moisture content is often 14 ~ 16% above, poor soil quality, high water level, which constitutes the root cause of this road dumping.