一、道路概况。甘肃某公路甲段气候干旱,冬季严寒(最低温度达零下30多度),夏季酷热(最高地面温度达60℃以上),日温差大(可达50余度),多风砂、少雨水。海拔最高达3000多米。路段表层砾石含量较少的软戈壁居多。沿线水源异常缺乏,困难地段运距达40公里。地下水一般很深,并含有氯盐、硫酸盐类,不宜饮用。沿线戈壁地区,可资利用的筑路砂砾材料比较丰富。原有道路路面多为就地利用天然砂砾材料铺筑而成的砂砾路面,厚度不一。经多年行车碾压,强度不匀,中间行车部分,坚硬密实,容重达2.3克/厘米~3 以上,强度甚高。两侧强度则偏低。由于戈壁地区气候干旱,路面混合料中缺乏粘结料。表层材料稳定性不足。加以交通密度较大,全线普遍出现严重搓板。为适应运输要求,决定改建,全 First, the road profile. A section of a highway in Gansu climate arid winter cold (minimum temperature of minus 30 degrees), summer heat (the highest ground temperature of 60 ℃ or more), the daily temperature difference (up to 50 degrees), more sand, less rain. Up to 3000 meters above sea level. Section of the surface layer of gravel content of soft Gobi less. Lack of water along the line anomalies, difficult sections of the transport distance of 40 km. Groundwater is generally deep, and contains chlorine salts, sulfates, should not drink. Along the Gobi area, available road gravel material rich. The original road pavement and more for the local use of natural gravel material paved gravel pavement, the thickness varies. After years of driving rolling, uneven strength, the middle part of the road, hard and dense, weighing up to 2.3 g / cm ~ 3 above, the intensity is very high. On both sides of the intensity is low. Due to the arid climate in the Gobi region, there is a lack of binder in pavement mixes. Surface material stability is not enough. Traffic density to be larger, all across the board serious washboard. In order to meet the transport requirements, decided to remodel, all