摘要
以降低城市地铁车站深基坑开挖对周围环境影响,保障地铁工程施工安全为目的,该研究依托西安市地铁二号线运动公园车站深基坑施工,对施工过程中钢支撑轴力、桩身水平位移、基坑周围地表沉降进行了现场监测,分析了工程开挖前后一段时期内基坑变形规律.研究结果表明:围护桩变形的最大部位在距桩顶2/3的基坑开挖深度处;距基坑长边10m左右地表变形随着基坑开挖深度增加,基坑开挖初期变形速率较大,随着开挖深度的增加,速率逐渐减小;钢支撑能够有效地限制围护桩的水平位移,随着基坑开挖深度和钢支撑的增加,钢支撑的轴力随之增大,最后随时间内力趋于稳定.
In order to reduce the impact of excavation of deep foundation pit of urban subway station on the surrounding environment and to ensure the safety of the construction , the axial force of steel support ,the horizontal displacement of pile and the surface deformation around the pit were observed in the construction site of deep foundation pit of sports park station of Xian subway .The results show ：The largest deformation of the envelope pile is at the 2/3 of the excavation depth from the top of the pile .The surface deformation around the pit of about 10m range increases with the excavation pit depth .The deformation rate is larger during the early excavation and decreases with the increase of excavation depth .The steel support can effectively limit the horizontal displacement of retaining piles .The axial force of steel support increases with the excavation depth and steel support increase ,and the internal force tends to be stable over time .
出处
《西安工业大学学报》
CAS
2014年第6期450-454,共5页
Journal of Xi’an Technological University
关键词
地铁车站
深基坑
变形
钢支撑
围护桩
subway station
deep foundation pit
deformation
steel support
envelope pile
