某大型深基坑开挖的数值分析与优化设计  

Numerical Analysis and Optimization Design of a Large-scale Deep Foundation Pit Excavation

作　　者：梁定燊 傅志斌 LIANG Dingshen;FU Zhibin(School of Civil Engineering,Guilin University of Technology,Guilin Guangxi 541004;Construction Comprehensive Survey,Research and Design Co.Ltd.,Beijing 100007)

机构地区：[1]桂林理工大学土木工程学院,广西桂林541004 [2]建设综合勘察研究设计院有限公司,北京100007

出　　处：《湖北理工学院学报》2025年第2期48-53,共6页Journal of Hubei Polytechnic University

摘　　要：以北京市朝阳区某基坑工程实例为研究对象,采用数值分析的方法和借助Midas GTS有限元仿真软件模拟基坑开挖过程,并结合现场监测实测数据分析了水平位移与地表竖向沉降的变化,同时研究了土钉倾角、桩间距、桩径、锚索间距等参数对结构变形特性的影响。结果表明:基坑桩身最大水平位移和地表最大竖向沉降变形各情况下的大小:实测数据<基坑支护设计方案<预警值。土钉倾角在15°~20°时,整体联合支护结构的安全系数较合适,地表竖向位移沉降最小。锚索间距为(1~1.1)d时,支护桩桩身水平位移最小;桩间距越小,支护桩限制桩身水平位移与地表沉降的效果越显著;桩径为1 m时,支护桩设计合理性与经济实用性综合评价最高。Taking a foundation pit project in Chaoyang District,Beijing as the research object,numerical analysis and Midas GTS finite element simulation software were used to simulate the excavation process.Combined with field monitoring data,the variations in horizontal displacement and surface vertical settlement were analyzed,while the effects of parameters including soil nail angle,pile spacing,pile diameter and anchor cable spacing on structural deformation characteristics were investigated.The results indicate,deformation magnitudes of maximum pile horizontal displacement and surface vertical settlement follow:measured data<foundation pit support design scheme<warning value.When soil nailing angle ranges between 15°~20°,the composite support structure achieves optimal safety factor and minimum surface vertical settlement.Anchor cable spacing of(1~1.1)d minimizes horizontal displacement of supporting piles.Smaller pile spacing significantly enhances the effectiveness of restraining pile displacement and surface settlement.A diameter is 1 m provides the highest comprehensive evaluation in design rationality and economic practicability.

关 键 词：深大基坑 数值模拟 现场监测 优化设计 

分 类 号：TU473[建筑科学—结构工程]