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冰川冻土 ›› 2019, Vol. 41 ›› Issue (1): 93-99.doi: 10.7522/j.issn.1000-0240.2019.0102

• 寒区科学与技术 • 上一篇    

青海204省道祁默段沿线多年冻土发育特征

庞伟军, 常刚, 苟海瑞, 王瑜鑫   

  1. 中铁西北科学研究院有限公司, 甘肃 兰州 730000
  • 收稿日期:2017-12-07 修回日期:2019-01-29 发布日期:2019-03-16
  • 作者简介:庞伟军(1986-),男,甘肃白银人,工程师,2013年在中国地质大学(武汉)获硕士学位,从事地质灾害防治与岩土设计工作.E-mail:709881249@qq.com
  • 基金资助:
    国道213线祁连县城叉路口至大通河桥段公路改建工程地质勘察项目资助

Characteristics of the permafrost from Qilian to Mole of the Highway 204 in Qinghai Province

PANG Weijun, CHANG Gang, GOU Harui, WANG Yuxin   

  1. Northwest Research Institute Co., Ltd. of China Railway Engineering Corporation, Lanzhou 730000, China
  • Received:2017-12-07 Revised:2019-01-29 Published:2019-03-16

摘要: 采用踏勘、挖探、钻探和地温测试手段,对区间冻土的分布、上限、年平均地温、含水率及冻土地貌等特征进行了分析研究。结果表明:研究区域多年冻土主要分布在海拔3 600 m以上地区;单一地貌形态下,冻土上限和年平均地温与海拔均呈近线性分布关系;受地形主控,积雪、蒸发、土体结构共同影响,相同海拔位置大冬树山北坡峡谷区冻土上限和年平均地温分别深和高于南坡缓坡区;地下含水量越高越有利于冻土的发育和保存,除影响冻土类型外,其在冻土边缘带是岛状冻土形成的主要因素;冻融草丘和冻融滑塌的发育程度一定程度上反映了冻土的基本特性。最后,针对区域冻土发育特征,探讨了204省道工程建设中冻土路基处理的应对工程措施。

关键词: 地温测试, 多年冻土, 发育特征, 工程措施

Abstract: Based on field exploration, testing, drilling and ground temperature monitoring, permafrost characteristics have been studied in the paper, such as permafrost distribution, permafrost table, annual mean ground temperature, water content and permafrost terrain and so on. As a result, it is clear that permafrost in the study area is mainly distributed above 3 600 m a.s.l. In various morphological forms, the relationship between permafrost table and annual mean ground temperature and altitude are nearly linear. Controlled primarily by the terrain and affected by snow cover, evaporation and soil structure, the permafrost table in the north slopes of Dadongshu Mountain is deeper and the annual mean ground temperature is higher as comparing with that in the south slopes. The higher ground water content is more conducive to the development and preservation of permafrost, in addition to affect the type of permafrost, it is the main factor for distribution of patchy permafrost in the edges of permafrost. And to a certain extent, the development degree of freeze-thaw grass mound and freeze-thaw slump reflects the basic characteristics of permafrost. In the end, according to the characteristics of regional permafrost, the corresponding engineering measures of permafrost subgrade treatment in the construction of 204-Provincial Road are discussed.

Key words: ground temperature monitoring, permafrost, development characteristics, engineering measures

中图分类号: 

  • P642.14