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冰川冻土 ›› 2016, Vol. 38 ›› Issue (6): 1568-1574.doi: 10.7522/j.issn.1000-0240.2016.0183

• 寒区科学与技术 • 上一篇    下一篇

多圈管冻结温度场特征分析及工程应用

陈军浩1,2, 李栋伟2,3   

  1. 1. 地下工程福建省高校重点实验室, 福建 福州 350118;
    2. 福建工程学院 土木工程学院, 福建 福州 350118;
    3. 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:2016-05-20 修回日期:2016-10-01 出版日期:2016-12-25 发布日期:2017-04-06
  • 作者简介:陈军浩(1986-),男,福建福州人,讲师,2013年在安徽理工大学获博士学位,从事岩土与地下工程领域的教学与科研工作.E-mail:chjhtougao@163.com
  • 基金资助:

    国家自然科学基金项目(51504070);福建省教育厅中青年教师教育科研项目(JA15353);福建工程学院科研启动基金项目(GY-Z15004)资助

Temperature field frozen with multi-circle pipes in shaft sinking: feature analysis and engineering application

CHEN Junhao1,2, LI Dongwei2,3   

  1. 1. Key Laboratory of Underground Engineering, Fujian Province University, Fuzhou 350118, China;
    2. School of Civil Engineering, Fujian University of Technology, Fuzhou 350118, China;
    3. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2016-05-20 Revised:2016-10-01 Online:2016-12-25 Published:2017-04-06

摘要:

多圈管冻结工法已在深厚地层井筒掘砌中广泛应用,但对多圈管冻结温度场需进一步深入研究。以某冻结井筒为原型,对关键层位开展冻结管无偏斜条件下的冻结温度场模型试验、进行冻结管偏斜条件下的温度场数值计算,同时利用温度场信息可视化软件对现场实测结果进行分析。将三种测试手段获得的结果进行比较,得出冻结管偏斜对冻结壁有效厚度影响较小,但对冻结壁平均温度、冻结壁交圈时间影响都很大,且容易在冻结壁内部产生密闭未冻承压水仓,造成冻胀力聚集,对冻结壁整体稳定性及井筒开挖不利。其结果可为多圈管冻结法凿井设计与施工提供参考。

关键词: 多圈管, 冻结温度场, 模型试验, 数值计算, 现场实测

Abstract:

Artificially multi-circle freezing method has been widely used in shaft excavation and masonry in deep stratum. However, the frozen temperature field needs further study. In this paper, one freezing shaft was taken as the prototype, together with freezing temperature field model tests under conditions of freezing pipes without deflection in key formations and temperature field numerical calculation considering the freezing pipe deflection, and also taking advantage of the temperature field of information visualization software to analyze the in-situ measurement results. The results of the three methods were compared. It is found that the frozen pipe deflection impacts on the effective thickness of the frozen wall a little, but has a great influence on the average temperature of frozen wall and the freezing circles intersection time. It is easily to generate closed unfrozen pressure water sump inside the frozen wall, causing frost heave force gathered, resulting in disadvantage of the overall stability of the frozen wall and the borehole excavation. This study will be useful for the multi-circle freezing method design and construction.

Key words: freezing pipes with multi-circles, temperature field below freeze point, model test, numerical calculation, measurement in situ

中图分类号: 

  • TD265.3