岩土力学 ›› 2019, Vol. 40 ›› Issue (9): 3425-3434.doi: 10.16285/j.rsm.2018.1186

• 基础理论与实验研究 • 上一篇    下一篇

渗流作用下北京砂卵石地层多排管局部 水平冻结体温度场试验

刘伟俊1,张晋勋2,单仁亮1,杨昊2,梁辰1   

  1. 1. 中国矿业大学 力学与建筑工程学院,北京 100083;2.北京城建集团有限责任公司 博士后工作站,北京 100088
  • 收稿日期:2018-07-14 出版日期:2019-09-10 发布日期:2019-09-05
  • 作者简介:刘伟俊,男,1996年生,博士研究生,主要从事人工冻结理论与技术方面的研究工作。
  • 基金资助:
    北京市科学技术委员会(No.Z161100001116088)

Experiments on temperature field of multi-row-pipe partial horizontal freezing body in Beijing sand-gravel stratum under seepage

LIU Wei-jun1, ZHANG Jin-xun2, SHAN Ren-liang1, YANG Hao2, LIANG Chen1   

  1. 1. School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China; 2. Postdoctoral Work Station, Beijing Urban Construction Group Co., Ltd., Beijing 100088, China
  • Received:2018-07-14 Online:2019-09-10 Published:2019-09-05
  • Supported by:
    This work was supported by the Beijing Science and Technology Commission (Z161100001116088).

摘要: 为研究渗流作用下多排管局部水平冻结体温度场扩展规律,基于相似准则,设计北京砂卵石地层冻结模型试验,从迎水面长度、顺水流长度、厚度3个维度研究渗流作用下多排管局部水平冻结体温度场扩展规律。研究表明:(1)水平冻结体中部发展速度最快,且温度最低;下部次之;上部最慢,且温度最高;(2)渗流作用使冻土柱由背水面向迎水面朝上游方向逐步交圈,且上、下游温度场不对称,冻结后期背水面呈坡屋顶形。(3)渗流作用对水平冻结体的影响随着渗流速度的增大而逐渐增大,积极冻结期末列冻土柱冻结锋面扩展速度、水平冻结体朝上游方向的平均发展速度均与渗流速度呈平方、负相关关系,渗流速度超过14.1 m/d时,冻土柱不交圈,为该模型试验的极限流速。基于等效梯形算法理论,给出的渗流作用下多排管局部水平冻结体的平均温度计算式,以便于评估水平冻结体发展状态。研究成果可为大流速地层盆形冻结施工提供依据。

关键词: 多排冻结管, 渗流作用, 温度场, 平均温度计算式

Abstract: According to the similarity criterion, the freezing model tests were carried out on Beijing sand-gravel stratum to study the expansion rule of the temperature field of the multi-row-pipe partial horizontal freezing body under the effect of seepage. Three factors were mainly investigated, including the length of water surface, downstream flow length, and thickness of the multi-row-pipe partial horizontal freezing body. The results show: 1) the temperature in the central part of the horizontal freezing body develops fastest and is the lowest, while the temperature in the upper part develops slowest and is the highest. 2) Percolation gradually makes the columns of the permafrost lap in the upstream direction from the downstream face to the upstream face. Moreover, the upstream and downstream temperature fields are no longer symmetrical. In the late stage of freezing, the back surface is in the shape of a sloping roof. 3) The effect of seepage on the horizontal frozen body progressively increases with the increase of seepage velocity. During the active freezing period, the freezing front expansion velocity of the last frozen soil column and the average development speed of the horizontal freezing body in the upstream direction are both in a squared and negatively correlated relationship with the seepage velocity. When the seepage velocity exceeds 14.1 m/d, the frozen soil column does not overlap, which is the limit flow rate of the model test. According to the theory of equivalent trapezoidal algorithm, the development of the horizontal freezing body can be easily evaluated by the average temperature formula of the multi-row-pipe partial horizontal freezing body under seepage. The research results can provide the basis for the basin-shaped freezing construction of large-flow velocity stratum.

Key words: multi-row freeze-tubes, percolation, temperature field, average temperature formula

中图分类号: 

  • TU457
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