摘要
以成都地铁17号线某车站深基坑为研究对象,对砂卵石地层条件下基坑工程的降水及围护方案进行了分析研究,重点分析了围护桩水平位移的时空变化规律。同时,对基坑标准段建立了有限元模型,对比分析了桩体水平位移的监测结果与计算结果,研究了降水方案以及不同围护桩直径对基坑围护结构变形的影响。结果表明:在富水砂卵石地层中,采用钢支撑+围护桩的围护结构体系能有效限制桩体的水平位移,其有限元分析计算结果与现场监测结果基本一致,计算模型和参数的选取可作为该地区同类工程设计施工的参考依据。此外,合理的降水方案能大幅度降低围护桩的变形,而在富水砂卵石地层中,宜选取直径尺寸为1.2 m的围护桩作为支护结构。
Taking the deep foundation pit of a station on Chengdu Metro Line 17 as the research object,the precipitation and enclosing scheme of the foundation pit engineering under sand pebble strata conditions were analyzed and analyzed,and the temporal and spatial variation of the horizontal displacement of the retaining pile was analyzed.At the same time,the finite element model was established for the standard section of the foundation pit.The monitoring results and calculation results of the horizontal displacement of the pile are compared and analyzed.The effects of the precipitation scheme and the diameter of different retaining piles on the deformation of the foundation retaining structure are studied.The results show that in the water-rich sand and gravel stratum,the retaining structure system with steel support and retaining pile can effectively limit the horizontal displacement of the pile.The finite element analysis calculation results are basically consistent with the on-site monitoring results.The calculation model and parameter selection can be used as reference for the design and construction of similar projects in the region.In addition,a reasonable precipitation scheme can greatly reduce the deformation of the retaining pile,and in the water-rich sand and gravel stratum,a retaining pile with a diameter of 1.2 m should be selected as the supporting structure.
作者
王峰
高月新
周勋
韦生达
吕岩
张涛
Wang Feng;Gao Yuexin;Zhou Xun;Wei Shengda;Lv Yan;Zhang Tao(China Communication North Road and Bridge Co.,LID.,Beijing 100024,China;Construction and Engineering College,Jilin University,Changchun 130026,China)
出处
《科技通报》
2020年第2期74-79,共6页
Bulletin of Science and Technology
基金
国家重点基础研究发展计划(2010CB731503)
关键词
富水砂卵石
水平位移
深基坑
有限元模拟
water-rich sand pebble strata
horizontal displacement
deep foundation pit
finite element simulation
