摘要
为探究流速对联络通道冻结温度场的影响,基于水热耦合理论构建地下水渗流条件下地铁联络通道冻结法施工数值计算模型,并采用现场实测数据对模型的合理性进行验证。运用该模型对南通市地铁2号线联络通道冻结帷幕的发展规律进行计算分析。结果表明,当地下水流速为3、6、9m/d时,冻结帷幕的交圈时间分别为20、28、34d。冻结帷幕交圈后,联络通道左墙(位于地下水上游)外侧与上、下墙外侧冻结帷幕厚度的增加速率均减小。在同一冻结时间下,随着流速增大,左墙内侧厚度增大,外侧厚度减小,右墙内侧厚度减小,外侧厚度增大,其中左墙内侧与右墙外侧增加的最为突出。在冻结稳定时期,冻结帷幕厚度的增加主要体现在内侧,外侧由于受地下水流速的影响,厚度增长率较低。由此可知,地下水流速是影响冻结帷幕发展情况的原因之一,流速越大冻结帷幕发展不均匀性越大,位于上游冻结壁发展速度越慢,下游冻结壁发展速度越快。该研究对探究不同流速下粉质粘土层联络通道冻结壁的发展状况具有参考价值。
To investigate the effect of flow velocity on the freezing temperature field in a contact channel,the numerical calculation model of subway contact channel freezing method construction under the condition of groundwater seepage was constructed,and the reasonableness of the model was verified by using on-site measured data based on the theory of water-heat coupling.The model was applied to calculate and analyze the development pattern of the frozen curtain in the contact channel of Nantong Metro Line 2.The calculations showed that the inter-circle time of the frozen curtain was 20d,28d,and 34d when the flow velocity was 3m/d,6m/d,and 9m/d,respectively.The rate of increase in the thickness of the frozen curtain decreased on the outside of the left wall of the contact channel(located upstream of the groundwater)after the intersection of the frozen curtain and on the outside of the upper and lower walls.Under the same freezing time,with the increase of flow velocity,the inner thickness of the left wall increases,the outer thickness decreases,the inner thickness of the right wall decreases,and the outer wall thickness increases,among which the inner thickness of the left wall and the outer wall of the right wall increase most significantly.During the frozen stability period,the thickness of the frozen curtain increases mainly in the inner side,and the thickness increases less in the outer side due to the influence of groundwater flow rate.It follows that,groundwater velocity is one of the factors affecting the development of the frozen curtain.The higher the velocity,the more uneven the development of the frozen curtain,the slower the development of the upstream frozen wall and the faster the development of the downstream frozen wall.This study provides a reference for exploring the development of frozen wall of silty clay layer contact channel at different flow rates.To provide reference for exploring the development of frozen walls in the connecting channels of silty clay layers under different flow velocities.
作者
荣传新
张薇
王彬
RONG Chuanxin;ZHANG Wei;WANG Bin(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan Anhui 232001,China;Engineering Research Center of Mine Underground Engineering,Ministry of Education,Anhui University of Science and Technology,Huainan Anhui 232001,China)
出处
《安徽理工大学学报（自然科学版）》
CAS
2023年第6期1-8,共8页
Journal of Anhui University of Science and Technology:Natural Science
基金
国家自然科学基金资助项目(51878005)
矿山地下工程教育部工程研究中心开放基金资助项目(JYBGCZX2022103)。
关键词
人工地层冻结法
地下水
联络通道
温度场
数值计算
artificial ground freezing method
groundwater
contact channel
temperature field
numerical calculation
