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李晓娜,杨双锁,鲍飞翔,等. 盾构始发端垂直冻结温度场数值分析与现场实测[J]. 科学技术与工程, 2020, 20(1): 297-302.
LI Xiao-na,BAO Fei-xiang,et al.Numerical Analysis and Field Measurement of Vertical Freezing Temperature Field at the Beginning of Shield Tunneling[J].Science Technology and Engineering,2020,20(1):297-302.
盾构始发端垂直冻结温度场数值分析与现场实测
Numerical Analysis and Field Measurement of Vertical Freezing Temperature Field at the Beginning of Shield Tunneling
投稿时间:2019-05-09  修订日期:2019-09-21
DOI:
中文关键词:  地铁  人工冻结技术  数值计算  温度场
英文关键词:subway  artificial freezing  technology numerical  calculation field  test temperature  field
基金项目:国家自然科学基金项目;山西省重点研发计划重点项目
           
作者单位
李晓娜 太原理工大学矿业工程学院
杨双锁 太原理工大学矿业工程学院
鲍飞翔 太原理工大学矿业工程学院
赵智辉 太原理工大学矿业工程学院
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中文摘要:
      太原地铁双塔西街站-大南门站区间盾构始发端采用垂直冻结法加固技术。由于盾构始发的特殊性,冻结帷幕的有效厚度能不能保证,是关系到土体加固是否安全的前提。本文通过建立三维数值模型对该工程冻结帷幕温度场随时间的发展规律展开研究,动态模拟冻结帷幕的演化过程,并且现场实时监测记录了冻结帷幕的温度变化和盐水温度随时间的变化情况,分析了在同一深度处各测温孔测点温度随时间的变化规律,计算了冻结帷幕厚度与冻结帷幕平均温度,验证了盾构是否具备始发的条件。研究表明:实测温度值和数值计算温度值总体趋势基本一致,采用垂直冻结方式、三排冻结管冻结施工的方案是合理的,用数值模型来模拟冻结帷幕温度场的变化过程是可行的。
英文摘要:
      The vertical freezing method is adopted to reinforce the shield tunneling between the Shuangta West Street station to the Da Nanmen station. Because of the particularity of shield initiation, whether the effective thickness of freezing curtain can be guaranteed is the precondition for the safety of portal reinforcement. In this paper, through the establishment of three dimensional numerical model for the freezing engineering curtain researches on the law of development of temperature field with time, the dynamic simulation of the frozen soil evolution process, and the real-time monitoring recorded the temperature of freezing curtain and brine temperature changes with time, the analysis of the depth in the same place the thermometer hole measuring point temperature variation law with time, to calculate the thickness of frozen wall with the average temperature of frozen wall, verify whether the shield with the initial conditions. The results show that the overall trend of the measured temperature value and the numerical calculation temperature value is basically the same, the scheme of vertical freezing method and three-row frozen pipe freezing construction is reasonable, and it is feasible to use the numerical model to simulate the change process of frozen soil curtain temperature field.
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