广州地铁超长水平冻结多参量监测分析  

Multi-parameter monitoring of frozen soil structure with super-long freezing hole drilling in Guangzhou metro

作　　者：姜耀东[1,2] 赵毅鑫[1,2] 周罡[3] 孙磊[4] 秦玮[5] 

机构地区：[1]煤炭资源与安全开采国家重点实验室,北京100083 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083 [3]广州市中心区交通项目领导小组办公室,广州510030 [4]北京市建筑设计研究院,北京100045 [5]山东电力工程咨询院,济南250013

出　　处：《岩土力学》2010年第1期158-164,173,共8页Rock and Soil Mechanics

基　　金：国家重点基础研究发展规划(973)项目(No.2010CB226801);国家自然科学基金项目(No.50704034);北京市教育委员会共建项目建设计划;煤炭资源与安全开采国家重点实验室自主课题资助

摘　　要：广州地铁3号线天河客运站折返线工程是目前国内最长、开挖断面最大的水平冻结隧道工程。文中根据不同施工阶段中对盐水温度、土层温度、地表变形、冻土压力、隧道衬砌变形等多个参量的现场监测数据,从时间和空间上分析了冻结帷幕演化过程、冻结帷幕发展速度等;探讨了土层温度变化规律以及冻土压力与土体温度间的相互关系,得出了在积极冻结期,沿测温孔深度方向土体温度的变化梯度随冻结时间增加不断减小,土体温度变化速率随时间增加而降低的特征;对比研究了冻结阶段、隧道开挖阶段和融沉阶段地表变形特征,并提出了缩短积极冻结期的建议和方法。The Tianhe Station horizontal frozen construction in Guangzhou metro No.3 line is the longest and biggest artificial ground freezing （AGF） project of the national metro construction currently. In the different phases of the construction; several parameters such as brine temperature, ground temperature, surface settlement/heave, swelling pressure, tunnel liner convergence and so on, are monitored dynamically. According to the data obtained from about 400 days in-situ monitoring, the features of propagation speed of the frozen soil wall and the brine temperature variation are discussed. The characteristics of ground temperature and the swelling pressure of soil are analyzed. The relationship between the ground pressure and the soil temperature is also achieved. Results show that the temperature gradient variation and soil temperature variance ratio decrease with the increasing of freezing time in the active freezing phase. The safety of frozen earth wall is also evaluated by different monitored data. Moreover, the environmental influence of the project is evaluated based on the surface frost heave and settlement data monitored in the process of construction. It is found that the pre-freezing time is too long which induces large surface frost heave and increases the project capital cost. The analytical results show that the pre-freezing time should be reduced.

关 键 词：水平冻结 地铁 监测 冻胀 冻结温度 冻结壁 

分 类 号：TU472.9[建筑科学—结构工程]