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冰川冻土 ›› 2016, Vol. 38 ›› Issue (4): 1129-1135.doi: 10.7522/j.issn.1000-0240.2016.0131

• 寒旱区重大工程问题 • 上一篇    下一篇

多年冻土区桥梁工程钻孔灌注桩温度场研究

商允虎1 2, 袁堃3, 牛富俊1, 吴旭阳1 2, 李金平3   

  1. 1. 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;
    2. 中国科学院大学, 北京 100049;
    3. 中交第一公路勘察设计研究院有限公司, 陕西 西安 710075
  • 收稿日期:2015-11-27 修回日期:2016-07-27 出版日期:2016-08-25 发布日期:2016-09-19
  • 作者简介:商允虎(1989-),男,黑龙江哈尔滨人,2015年在黑龙江大学获硕士学位,现为在读博士研究生,从事多年冻土区桥梁工程桩基础热力特性研究.E-mail:shangyunhu@126.com
  • 基金资助:
    国家科技支撑计划项目(2014BAG05B05)资助

Study on ground temperature of cast-in-place pile of bridge in permafrost regions

SHANG Yunhu1 2, YUAN Kun3, NIU Fujun1, WU Xuyang1 2, LI Jinping3   

  1. 1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. CCCC First Highway Consultants Co., Ltd., Xi'an 710075, China
  • Received:2015-11-27 Revised:2016-07-27 Online:2016-08-25 Published:2016-09-19

摘要: 针对多年冻土区钻孔灌注桩施工中混凝土水化热对冻土温度扰动问题,以青藏公路214沿线查拉坪旱桥桩基为实例,结合桩基施工完成后现场地温观测数据,进行了钻孔灌注桩水化热对桩周土体温度的影响研究,并分析桩周土回冻过程中地温场的变化规律.结果表明:混凝土水化热对距桩0.6 m与0.9 m处冻土温度影响较大.距桩2 m的测温孔温度曲线受混凝土水化热的影响较小,可以忽略.桩基施工完成后33天后桩侧开始出现负温,119天后桩侧各土层均降至负温,134天后桩侧土形成稳定冻土,201天后桩侧各土层温度与天然孔较接近.

关键词: 多年冻土区, 钻孔灌注桩, 水化热, 冻土温度场

Abstract: Based on the temperature field observation of permafrost around the cast-in-place pile foundation of Chalaping bridge along the Qinghai-Tibet Highway 214, the thermal effects of cast-in-place pile hydration heat are studied and the variation laws of temperature field during refreezing process are analyzed. Results show that: (1) Hydration heat significantly influences the temperature of CA15 and CA14, while slightly disturbs the CA17 with a distance of 2 m to pile. (2) It took 33 days after pile construction, when the negative temperature can be seen on the pile skin. 119 days after construction, the temperature of all pile skin dropped to negative. It took 134 days after construction to refreeze the soil around the pile and 201 days to decrease the pile temperature to natural temperature.

Key words: permafrost regions, cast-in-place pile, hydration heat, temperature field of permafrost

中图分类号: 

  • TU475+.2