一、前言大兴安岭林区公路常年通车的干、支线路网密度较小,一般按林Ⅰ～Ⅳ级道路修建;而岔线路网密度较大,它包括简易道(或简易岔线)和冻板道。其中,简易道主要用于夏季的木材生产及木材生产后的营造林等活动,因此需要进行养护,并能保证常年通车,以满足木材生产与营林生产的需要;冻板道则是仅从冬季木材生产角度考虑修建的临时性道路,使用在结冰后至融雪前。大兴安岭林区气候寒冷,冬季漫长,根据这一特点,在岔线密度一定时,从降低木材生产成本的角度适 I. Introduction Daxinganling forest roads opened to traffic perennial, branch line density is relatively small, generally according to Lin Ⅰ ~ Ⅳ grade road construction; and bifurcation line network density, which includes simple road (or simple fork) and frozen plate Road. Among them, the simple road is mainly used for wood production in the summer and the afforestation and other activities after the wood production, so the need for conservation, and to ensure perennial traffic to meet the needs of timber production and forest production; frozen plate Road is only from Consider the temporary road to be constructed from the perspective of winter timber production, before use after icing to snowmelt. Daxinganling forest climate cold, long winter, according to this feature, at a certain density of the fork, from the perspective of reducing the cost of timber production