摘要
为了研究桩锚支护深基坑开挖对邻近浅基础框架建筑结构变形和内力的影响,本文针对某基坑工程进行了现场地表沉降和支护结构位移的实测分析,并采用有限差分程序FLAC3D建立了考虑上部结构—基础—地基相互作用的三维数值模型。采用数值模拟对桩锚支护深基坑开挖影响下地层应力、围护结构变形以及邻近浅基础框架结构的附加内力演化进行了较为详细的分析,通过实测数据验证了数值模型的合理性。分析结果表明:本文采用的桩锚支护方案及施工参数能较好地控制地层变形并保障邻近既有浅基础建筑结构的安全。桩锚支护基坑开挖不仅导致浅基础结构产生差异沉降,还会引起基础水平位移。桩锚支护基坑开挖后结构柱附加弯矩趋向于集中在框架底层,建议类似工程中结构安全监测重点布置在紧临开挖侧的低楼层板柱连接处。
Based on the field measured data of a foundation pit project and the numerical simulation method, the effects of deep foundation pit excavation on the deformation characteristics and internal force changes of adjacent shallow foundation frame structures are studied. The three-dimensional numerical model considering the interaction between structure-foundation-ground is established by using the finite difference program FLAC3D, and the rationality of the numerical model is verified through field measured data. The analysis results show that the pile-anchor support design and construction parameters adopted in this paper can well control the ground deformation and ensure the safety of the adjacent shallow foundation structure. The excavation of the pile-anchor supporting excavation not only causes the differential settlement of the shallow foundation structure, but also causes the horizontal displacement of the foundation. After the excavation, the additional bending moment of the structure is mainly concentrated at the bottom of the frame. It is recommended that the structural safety monitoring in similar projects should be placed on the low-rise floor close to the excavation side.
作者
姚君
谭鑫
刘文智
刘晓明
黄明华
Yao Jun;Tan Xin;Liu Wenzhi;Liu Xiaoming;Huang Minghua(Changsha Public Engineering Construction Center,Changsha 410023,China;College of Civil Engineering%Hunan University,Changsha 410082,China;Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education,Hunan University,Changsha 410082,China)
出处
《工程勘察》
2022年第2期1-6,78,共7页
Geotechnical Investigation & Surveying
基金
湖南创新型省份建设专项经费资助(2019GK1010)。
关键词
基坑
桩锚支护
浅基础
地层变形
数值模拟
foundation pit
anchored pile support
shallow foundation
ground deformation
numerical simulation
