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国道317线岗托至妥坝段地质构造复杂,断裂、褶皱发育,新构造运动强烈。区内水系发育,气候恶劣、昼夜温差大、降水丰沛,6~9月为雨季,多暴雨,冰雪融水丰富,冻融交替,物理风化作用强烈且影响深度较大,在构造运动及外营力风化剥蚀作用下,地表岩层土体破碎、沟谷狭窄且坡降大、水流湍急、下切能力强且切割较深。线路两侧山坡堆积物松散、裸露基岩节理裂隙发育,岩体破碎,大部分路段坡面植被稀疏,且以草甸、灌木为主,根
State Road 317 line post to Datoer dam complex geological structure, fracture, folds, strong neotectonic movement. The water system in the area is developed with a bad climate, with a large temperature difference between day and night, abundant rainfall, a rainy season from June to September, heavy rainstorms, abundant ice and snow melt, alternating freeze-thaw cycles, strong physical weathering and greater depth of influence. Under the action of weathering and denudation, the ground rock mass is broken, the valley is narrow and the slope is large, the current is fast and the cutting ability is strong and the cutting is deeper. Loose deposits on hillsides on both sides of the line, joints and fissures of exposed bedrock are developed and the rock mass is broken, most of the road sections are sparsely covered with vegetation and mainly shrubs and roots