摘要
依托卵石地层某地铁区间联络通道兼废水泵房冻结施工工程,整理了大流速条件下冻结温度场的实测数据,分析了地下水流速和流向对冻结效果的影响,以及采用补强冻结措施后的冻结效果。结果表明,冻结期间土体温度下降大致分为4个阶段:快速降温阶段、水潜热释放阶段、稳定降温阶段、冻结维护阶段。随着冻结深度的增加,土体的温度逐步降低。冻结管内侧区域温度发展较外部区域低8~10℃,内部冻结发展更快。联络通道顶端冻结效果优于底端;对于通道侧墙范围,左侧侧墙冻结效果优于右侧。通过对地下水流速、流向监测,结合冻结管纵向测温技术,确定了工程薄弱区域为受地下水流影响最大的区域,即位于右线副孔面的中下部位置。通过通道补孔、注浆施工等补强措施,有效地减小了地下水流对冻结效果的影响,各测温孔温度较补强前下降了4~7℃,表明补强措施有效。研究成果可为类似工程提供借鉴。
Based on the freezing construction of a subway connected aisle with wastewater pump house in a pebble stratum,this paper analyzed the measured data of the freezing temperature field under high flow velocity,the influence of groundwater flow velocity and direction on the freezing effect,and the freezing effect after reinforcement measures.The results show that the soil temperature drop during freezing can be roughly divided into four stages,rapid cooling stage,latent heat release stage of water,stable cooling stage and freezing maintenance stage.As the freezing depth increases,the soil temperature gradually decreases.The temperature in the inner area of the freezing pipes is 8~10°C lower than that in the outer area,indicating faster internal freezing development.The freezing effect at the top of the connecting passage is better than that at the bottom.During the sidewall freezing process,the left sidewall exhibits a better freezing effect than the right side.By monitoring the groundwater flow velocity and direction and combining it with longitudinal temperature measurement technology of freezing pipes,the weak area in this project was identified as the region most affected by groundwater flow,located in the middle-lower part of the auxiliary freezing pipe surface on the right line.After reinforcement measures such as supplemental borehole drilling and grouting construction,the influence of groundwater flow on the freezing effect was significantly reduced.The temperatures at each measuring point dropped by 4~7℃compared to before,demonstrating the effectiveness of the reinforcement measures.The research findings can provide valuable references for similar projects.
作者
薛茹镜
于娇
侯宇迪
黄怀宁
王绮绮
XUE Rujing;YU Jiao;HOU Yudi;HUANG Huaining;WANG Qiqi(Beijing General Municipal Engineering Design and Research Institute Co.Ltd.,Beijing 100082,China;Railway Engineering Research Institute,CARS,Beijing 100081,China;QSHE,China Overseas Engineering Group Co.Ltd.,Beijing 100048,China)
出处
《铁道建筑》
北大核心
2025年第6期136-142,共7页
Railway Engineering
关键词
盾构隧道
人工冻结法
地铁
联络通道
大流速卵石地层
现场实测
补强措施
shield tunnel
artificial freezing method
subway
connected aisle
high flow pebble stratum
field test
reinforcement measure
作者简介
第一作者:薛茹镜(1984-),男,高级工程师,硕士。E-mail:xuerujing@126.com。
