摘要
【目的】合理有效的开挖支护方案对于控制基坑变形具有重要意义,因此有必要对深基坑支护设计及变形控制进行研究。【方法】以成都市某医院项目基坑为研究对象,结合其复杂的地质条件,设计了4种适用于不同区段的开挖支护方案。选取两个典型剖面构建网格模型,采用有限差分法模拟基坑开挖变形过程。【结果】结果表明,基坑开挖变形均在监测项目的安全范围内,验证了所提出的支护方案的合理性和有效性。具体而言,Ⅰ-Ⅰ′剖面采用双层放坡开挖+锚杆支护后,基坑坡顶最大水平位移量为9.3 mm,地表沉降最大为3.8 mm;Ⅱ-Ⅱ′剖面采用灌注桩+锚杆支护后,围护桩最大挠度为2.1 mm,地表沉降最大为11.4 mm。【结论】提出的支护方案能够有效控制基坑变形,确保了基坑及周边环境的安全,研究成果对类似地质条件下的城市基坑工程的安全施工管理具有一定的参考意义。
[Purposes]Reasonable excavation support schemes are critically important for controlling foundation pit deformation,making it essential to investigate deep foundation pit support design and de⁃formation control.[Methods]Taking a hospital foundation pit project in Chengdu as the research subject,four excavation and support schemes suitable for different sections were designed according to its com⁃plex geological conditions.Two typical cross-sections were selected to establish grid models,and the fi⁃nite difference method was employed to simulate the deformation process during excavation.[Findings]The results demonstrate that all excavation-induced deformations remain within the safety thresholds of the monitoring project,confirming the rationality and effectiveness of the proposed support schemes.Spe⁃cifically:For SectionⅠ-Ⅰ′using two-tiered slope excavation with anchor support,the maximum hori⁃zontal displacement at the pit crest reached 9.3 mm,with maximum surface settlement of 3.8 mm.For SectionⅡ-Ⅱ′adopting bored pile-anchor support,the maximum retaining pile deflection was 2.1 mm,accompanied by maximum surface settlement of 11.4 mm.[Conclusions]The proposed support schemes effectively control foundation pit deformation,ensuring the safety of both the excavation and surrounding environment.The research outcomes provide valuable references for safety management and civilized construction of urban foundation pit projects under similar geological conditions.
作者
郭芮
GUO Rui(Chengdu Hengxin Talent Development Co.,Ltd.,Chengdu 611100,China)
出处
《河南科技》
2025年第15期64-68,共5页
Henan Science and Technology
关键词
深基坑
支护设计
变形控制
有限差分法
基坑监测
deep foundation pit
support design
deformation control
finite difference method
foundation pit monitoring
