摘要
对某公路隧道盾构始发段深基坑施工期监测进行了介绍,重点分析了围护墙(桩)顶水平位移及沉降、围护桩深层水平位移(测斜)、围护墙(桩)内力、混凝土支撑轴力、地表沉降、基坑外水位等监测成果。监测成果表明,施工监测基本反映了基坑在施工过程中围护结构与周边环境的受力和变形情况,对施工进行了较好的指导,保证了施工安全;混凝土支撑轴力受温度、混凝土徐变及龄期的影响,使得实际监测值可能大于报警值,应对报警值进行准确合理的设定;各监测指标受施工工序、降雨、外部荷载等因素影响;地下连续墙支护效果优于其他围护方式;对各项监测数据要结合专业知识、现场情况和工程经验等进行综合评判后再决定是否报警,为基坑安全施工提供数据保障。
Construction monitoring to the foundation pit of a shield tunnel is introduced. Monitoring results focus on analysis of the horizontal displacement and settlement of the top of retaining walls and piles, deep horizontal displacement of retaining piles, internal force of retaining walls and piles, axial force of concrete support structures, ground settlement and water level outside of the foundation pit. The results show that： （1） the construction monitoring basically shows the force situation and deformation of retaining structures and the surrounding environment of the foundation pit in the construction process, and guides the construction and ensures the safety of the foundation pit; （2） axial force of concrete support structures is influenced by temperature, creep and age of the concrete, which makes the motoring value bigger than the alarm value, so the alarm value should be set accurately and rationally; （3） the monitoring indexes are influenced by construction procedure, rainfalls, external loads, etc; （4） the supporting effect of diaphragm walls is better than other patterns; and （5） all the monitoring results should be analyzed synthetically combined with professional knowledge, situations in the field and engineering experiences before deciding whether to give the alarm, providing insurance in terms of data for the safe construction of the foundation pit.
作者
李克先
杨忠年
李术才
LI Ke-xian;YANG Zhong-nian;LI Shu-cai(School of Civil Engineering, Qingdao Technological University, Qingdao 266033, China;Qingdao Metro Group Co. Ltd. , Qingdao 266000, China;School of Civil Engineering, Qingdao Technological University, Qingdao 266033, China)
出处
《公路》
北大核心
2017年第12期282-288,共7页
Highway
关键词
隧道
深基坑
地下连续墙
监测
分析
tunnel
deep foundation pit
diaphragm wall
monitoring
analysis
