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冰川冻土 ›› 2001, Vol. 23 ›› Issue (3): 323-317.

• 研究论文 • 上一篇    下一篇

小兴安岭地区黑河—北安段多年冻土分布特征

张艳1, 吴青柏2, 刘建平1   

  1. 1. 黑龙江省高速公路建设局, 黑龙江, 哈尔滨, 150036;
    2. 中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室, 甘肃, 兰州, 730000
  • 收稿日期:2001-02-08 修回日期:2001-02-22 出版日期:2001-08-25 发布日期:2012-04-26

Distribution Characteristics of the Permafrost in the Section from Heihe to Bei’an in the Xiao Hinggan Mountains

ZHANG Yan1, WU Qing-bai2, LIU Jian-ping 1   

  1. 1. Expressway Construction Bureau of Heilongjiang Province, Harbin Heilongjian 150036, China;
    2. State Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou Gansu 730000, China
  • Received:2001-02-08 Revised:2001-02-22 Online:2001-08-25 Published:2012-04-26

摘要: 对于寒区公路工程,查清冻土工程地质条件是至关重要的.利用地质雷达和探孔来研究多年冻土的分布,为路基设计和处理提供依据.研究结果表明,黑北段分布有17段岛状多年冻土,总长度为3.15km,主要分布于沼泽化湿地、泥炭层和草炭层极为发育低洼地带.多年冻土上限约1.5~2.0m,多年冻土厚度3~m.主要发育有多冰冻土、富冰冻土、饱冰冻土.多年冻土地温较高,热稳定性较差,多年冻土处于强烈的退化状态.

关键词: 小兴安岭, 岛状多年冻土, 分布特征

Abstract: Engineering geology appraisement is the key of highway design aiming at roadbed stability in the regions with degrading permafrost. Especially in the regions of sporadic permafrost, exploring its spatial distribution is necessary. Permafrost is in the process of intensive degradation due to climate warming. However, thermal disturbance of engineering activities will accelerate the degradation. Degrading permafrost mainly presents in the areas with swampy wetland or peat in the Xiao Hinggan Mountains. Peat can delay the degradation owing to insulating, and removing the peat will accelerate the degradation, disadvantageous to roadbed stability. Permafrost distribution, formation and its engineering geological conditions must be studied in detail for the highways in cold regions. However, drilling is difficult to exactly explore sporadic permafrost distribution. Therefore, sporadic permafrost distribution is always surveyed by geological radar and exploring holes in order to provide the base of roadbed design and disposal. Exploring results show that the section from Heihe to Beian is located in sporadic permafrost regions, where there are 17 permafrost sections, 3.165 km in total length. The mean annual ground temperature is higher and the thermal stability is poor in the section. Sporadic permafrost presents in the swale swampy wetland with peat and surface water. Permafrost distribution and development has an obviously difference in different topographic units under the effect of conversing-temperature, vegetation, soil, aspect, surface water and ground water. Generally, permafrost mainly appears in ditch valley. No permafrost takes place in high slopes and mountains. Seasonally frozen and thawed depth is about 1.5 m to 2.0 m, with the maximum of about 2.5 m. Permafrost thickness is about 3 to 6 m, with the maximum is about 9 m. Ground ice appears in massive, micro-layered, layered cryostructures near the permafrost table.

Key words: Xiao Hinggan Mountains, sporadic permafrost, highway design

中图分类号: 

  • P642.14