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为了研究季节性冻土地区的防冻胀措施及其效果,在G109国道青海省橡皮山段铺设了垫层不同的2个断面,即参照断面和试验断面,并对温度、含水量及路面变形数据进行了分析。结果表明:试验断面下的最大季节冻结深度小于1m,小于天然地面下的季节冻结深度;在冷季期间,两试验段在冻结深度范围内的含水量较低,低于起始冻胀含水量;参照断面的变形比较稳定,路面有微小上升,而试验断面路面没有上升现象;在季节性冻土地区采用碎石路面垫层加隔水土工膜能有效减少季节冻深,并减小道路冻胀变形。
In order to study the frost heave prevention measures and their effects in seasonal frozen soil area, two sections with different cushion layers, ie, reference section and test section, are laid in the section of rubber hill in Qinghai Province, G109 national highway. Temperature, water content and deformation data Analyzed. The results show that the maximum seasonal freezing depth under the experimental section is less than 1m, which is less than the seasonal freezing depth under the natural ground. During the cold season, the water content of the two experimental sections in the freezing depth range is lower than the initial freezing water content ; The deformation of the reference section is relatively stable, the surface of the pavement is slightly increased, but the pavement of the test section does not rise; the use of gravel pavement cushion and waterproof geomembrane in the seasonal frozen soil can effectively reduce the season freezing depth and reduce the road freezing Deformation.