基于实测解冻温度的联络通道冻结法融沉注浆优化研究  

The connecting passage freezing method thaw settlement grouting optimization study in accordance with measured thawing temperature

作　　者：吴繁[1] 杨平[1] 万朝栋[2] 张尚贵[2] 何文龙[1] WU Fan YANG Ping WAN Chaodong ZHANG Shanggui HE Wenlong(College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China China Railway 18th Bureau Group Co., Ltd., Tianjin 300222, China)

机构地区：[1]南京林业大学土木工程学院,江苏南京210037 [2]中铁十八局集团有限公司,天津300222

出　　处：《南京林业大学学报（自然科学版）》2017年第4期167-172,共6页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家自然科学基金项目(51478226);住房和城乡建设部科学技术项目(2014-k3-029)

摘　　要：【目的】冻结法施工中,为了工后跟踪注浆及控制融沉,必须了解地铁联络通道解冻温度发展规律。【方法】以软土隧道联络通道冻结法工程为背景,对解冻温度场、深层土体温度变化规律等进行了实测;为更有效控制融沉,对其跟踪注浆时机及顺序、注浆工艺及材料进行了优化。【结果】联络通道解冻20 d内,部分土体温度开始达到0℃附近,冻土进入相变阶段;入土深度越大,土体相变阶段持续时间越长;软土融沉主要发生在解冻前2个月,侧墙及顶部完全解冻需要4个月,则跟踪注浆至少应持续的时间为3~4个月。【结论】控制融沉过程中,注浆应按照由底部→顶部→侧墙的顺序先后进行;同时要根据实测温度和地面沉降量实行双控标准。合理安排施工顺序和注浆参数,加强监测,可以进一步使得联络通道周边土层受融沉影响范围缩小,降低联络通道顶部受融沉的影响程度。【Objective】In the construction of freezing method,grasping the development rule of thawing temperature of the subway interconnecting road is the essential for tracking grouting and controlling the thawing settlement after the construction.【Method】With the background of freezing method project of the soft oil subway interconnecting road,the changing rule of the melting temperature field and deep soil temperature etc.are measured;to control the thawing settlement more efficiently,the opportunity and order of tracking the grouting and the grouting process and materials are optimized.【Result】In the 20-day thawing of the connected aisle,the temperature of some soils began to reach near 0 ℃,and the frozen earth entered the phase transition stage;the deeper the embedded depth,the longer the time of the soil phase change.The soft soil thaw settlement mainly appears two months before thawing and the fully thawing of the side wall and the top takes four months,then,3—4 months is the least time to track grouting.【Conclusion】During the process of controlling the thaw settlement,the grouting should be carried out in the order of the bottom → the top → the side wall.At the same time,the double control standards should be implemented according to the measured temperature and the land subsidence amount.Reasonable arrangement of construction sequence and grouting parameters,as well as the reinforcement of the monitoring,can further reduce the scope of the soil around the connected aisle affected by the thaw settlement and reduce the impact of the top of the connected aisle by the thaw settlement.

关 键 词：联络通道 冻结法 解冻温度场 地面沉降 跟踪注浆 城市轨道交通 

分 类 号：U45[建筑科学—桥梁与隧道工程]