摘要
为研究高边坡偏压作用对综合管廊深基坑的影响规律,合理设计基坑支护结构,基于平潭综合管廊项目,针对原设计中钢筋混凝土撑拆除工序繁琐等问题,将其优化成钢管撑。采用有限元软件模拟地下综合管廊内支撑优化前后的基坑变形特征。结果表明:基坑支护结构及周边地表变形受高边坡偏载效应影响显著;相较于原设计,优化后的围护墙侧移、周边地表沉降和支撑内力的变化量较小。现场监测表明,优化后的内支撑能满足基坑变形及稳定性的要求,不仅节约了造价,也加快了工程进度。
In order to study the influence of high slope bias on the deep foundation pit of utility tunnel,and reasonably design the supporting structure of foundation pit,based on Pingtan comprehensive pipe gallery project,aiming at the problems such as the tedious removal process of reinforced concrete brace in the original design,the steel pipe support was optimized. The finite element software is used to simulate the deformation characteristics of the foundation pit before and after the optimization of the internal support of the underground utility tunnel. The results show that: the deformation of foundation pit support structure and surrounding surface is significantly affected by high slope eccentric load effect;compared with the original design,the changes of retaining wall lateral displacement,surrounding surface settlement and support internal force are smaller after optimization. Field monitoring shows that the optimized inner support can meet the requirements of deformation and stability of foundation pit,which not only saves the cost,but also speeds up the project progress.
作者
翟小军
Zhai Xiaojun(China Railway First Group Co.,Ltd.,Xi'an 710054,China)
出处
《铁道勘察》
2020年第5期35-40,共6页
Railway Investigation and Surveying
基金
中铁一局集团有限公司技术研发项目(2017A-043)。
关键词
地下综合管廊
深基坑
邻近高边坡
内支撑
现场监测
Underground pipe gallery
Deep foundation pit
Adjacent high slope
Internal support
Field monitoring
