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哈尔滨铁路局牙林线K91位于大兴安岭北坡,东经121°41′,北纬50°10′,海拔750m。每年平均气温-4.2℃,季节冻层约1.2m,冻土上限为2.4m左右,为岛状多年冻土地区。地表坡约20％。表层系塔头草泥炭层,厚0.4～0.8m多存水,常年饱和;下层主要是淤泥黑色砂粘土,部分有砾砂,厚0.8～1.2m,含水量大于40％,层状冰发育,一般厚为2～4mm,最厚可达30mm;再下部是黄色砂粘土,厚为1.2m左右,含水量为26％。
Harbin Railway Bureau Yalin Line K91 is located in the northern slope of Daxinganling, east longitude 121 ° 41 ’, north latitude 50 ° 10’, elevation 750m. The annual average temperature of -4.2 ℃, seasonal frozen layer of about 1.2m, frozen soil upper limit of about 2.4m, for the island permafrost area. About 20% of the surface slope. The surface layer of peat grass layer, thickness 0.4 ~ 0.8m more water, perennial saturation; the lower is mainly silt black sand clay, some gravel sand, thickness 0.8 ~ 1.2m, water content greater than 40%, stratified ice development, Generally thick 2 ~ 4mm, the thickest up to 30mm; then the lower part is yellow sand clay, thickness of about 1.2m, water content of 26%.