河西走廊地区路基阴阳坡效应及合理高度分析  

The effect of southern and northern slopes and reasonable height of subgrade in Hexi Corridor

作　　者：张明礼[1,2,3] 岳国栋 丑亚玲 王得楷[2] 王斌[1] 周志雄[1] ZHANG Mingli;YUE Guodong;CHOU Yaling;WANG Dekai;WANG Bin;ZHOU Zhixiong(Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology,Lanzhou 730050,China;Geological Hazards Prevention Institute,Gansu Academy of Sciences,Lanzhou 730000,China;State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environmental and Resources,Chinese Academy of Sciences,Lanzhou 730000,China)

机构地区：[1]兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050 [2]甘肃省科学院地质自然灾害防治研究所,甘肃兰州730000 [3]中国科学院西北生态环境资源研究院冻土工程国家重点实验室,甘肃兰州730000

出　　处：《冰川冻土》2019年第6期1430-1440,共11页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(41801033; 41961010);甘肃省科技计划-青年科技基金项目(17JR5RA115);甘肃省高等学校科研项目(055003);中国博士后科学基金项目(2017M623268)资助

摘　　要：河西走廊是丝绸之路的咽喉,区域内季节冻土路基的稳定性对亚欧大陆运输通道有重要影响。以张掖地区季节冻土路基为例,基于传热学及弹塑性变形理论探讨了路基在阴阳坡效应下的地温和变形分布;通过比较路基最大冻结深度到地下水位的距离与毛细水最大上升高度,得到河西走廊地区路基合理高度的确定方法及拟合公式,来表示其与地下水位以及年平均气温的相互关系。结果表明:张掖地区路基阴阳坡效应明显,阴坡冻结时间比阳坡长2个月;1月阴阳坡的温差最大,达到3℃;2月,路基的竖向最大位移达到26 mm,横向位移差达到6 mm;路基合理高度随年平均气温的升高而逐渐降低,随地下水位的增加而逐渐变大,其随年平均气温的变化幅度小于地下水。该研究可定性分析路基合理高度与年平均气温、地下水位的关系,为河西走廊地区定量计算路基高度提供理论参考。The Hexi Corridor is an important area of the Belt and Road, where the stability of the seasonal frozen soil subgrade has an important impact on the Eurasian continental transport corridor. Taking the seasonal frozen soil subgrade in Zhangye Prefecture as an example, based on heat transfer and the theory of elastoplastic deformation, the ground temperature and deformation of subgrade on the shade and sunny slopes were discussed. By comparing the maximum freezing depth of subgrade with the groundwater level and the maximum rising height of the capillary water, the method for determining the reasonable height of subgrade in Hexi Corridor and the fitting formula were obtained and the relationship between groundwater level and annual average temperature was gained. The effect of shade and sunny slopes of subgrade in Zhangye Prefecture was explained. Frozen time on the shade slopes was two months longer than that on the sunny slopes. Temperature difference between the shade and sunny slopes is the maximum in January, reaching 3 ℃. In February, the vertical maximum displacement of subgrade reached 26 mm, and the lateral displacement difference reached 6 mm. The reasonable height of subgrade gradually decreases with the increase of annual average temperature and gradually increases with the increase of groundwater level. The variation range of reasonable subgrade height with the annual average temperature is smaller than that with the groundwater level. This study can qualitatively analyze the relationship between the reasonable height of subgrade, the annual average temperature and groundwater level and will be useful for quantitative calculation of subgrade height in Hexi Corridor.

关 键 词：季节冻土 路基工程 合理高度 阴阳坡 河西走廊 

分 类 号：P642.14[天文地球—工程地质学] U419[天文地球—地质矿产勘探]