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一、概况 我局管内的裂土路基病害,集中分布在阳安线代家坝至安康和襄渝线早阳至月河两段。阳安线由汉中至安康,多为风化页岩、砂岩、砂砾层,其覆盖层多属裂土。襄渝线由早阳至月河,基岩主要由各类变质岩及火成岩或沉积岩组成,上部为不同厚度的裂土覆盖层,线路沿汉江、月河阶地通过,由于两河支流(沟)垂直切割,使阶地呈平行陇岗状,阶地地面坡度约为1:10;阶地前缘稍陡,地面坡度约1:4,沟壁两侧自然边坡约1:1.5～1:3.0。自然
First, the general situation I cracked pipe subgrade disease, concentrated in the positive An-Dai Daijiaba to Ankang and Xiangyu line early Yang to Yuehe two. Yang’an line from Hanzhong to well-being, mostly weathered shale, sandstone, gravel layer, the cover is mostly rift. Xiangyu line from early Yang to the month river, bedrock mainly by all kinds of metamorphic rocks and igneous or sedimentary rock composition, the upper part of the thickness of the split layer, the line along the Han River, Moon River terrace through the tributaries (ditch) Vertical cutting, so that the terraces parallel to Longgang-like, terraces slope gradient of about 1:10; terraces leading edge slightly steep, the ground slope of about 1: 4, the natural slope on both sides of the trench wall about 1: 1.5 ~ 1: 3.0. natural