基于MIDAS GTS对基坑支挡结构的优化分析  

Optimization analysis of foundation pit retaining structure based on MIDAS GTS

作　　者：周宪伟[1] 李德海[1] 王维铭[1] ZHOU Xianwei;LI Dehai;WANG Weiming(College of Civil and Architectural Engineering,Heilongjiang Institute of Technology,Harbin 150050,China)

机构地区：[1]黑龙江工程学院土木与建筑工程学院,哈尔滨150050

出　　处：《黑龙江工程学院学报》2023年第3期1-7,共7页Journal of Heilongjiang Institute of Technology

基　　金：黑龙江省自然科学基金项目(LH2022D020)。

摘　　要：为了验证采用三维有限元方法对基坑支挡结构优化设计的可靠性,基于MIDAS GTS NX对基坑支挡结构进行三维有限元分析,模拟分阶段开挖,并适时地建立横向支撑。开挖完成后分为5级施加地面超载。通过分析得到基坑边缘的地表变形、支挡结构挡板位移、竖直排桩、横向腰梁和横向支撑等主要构件的内力和变形。然后对支挡结构模型从预埋、开挖和加载的整个过程进行实验室试验,试验过程中测量了开挖完成后和各级加载完成后基坑边缘测点的地表变形,观察了挡板、排桩、腰梁和支撑的受力和变形情况,并将数值分析与试验结果进行对比,墙板变形较大处为两列支撑的中间区域,且上部大、下部小;模拟分析中墙板、腰梁和支撑的内力反映了构件的实际受力情况,可以根据分析结果对构件进行优化;地表变形与试验结果误差较小,基本吻合,与实际的地表变形规律一致,大小接近。基坑支护结构的数值三维模拟分析结果可信,可用于基坑支护结构的优化设计。最后利用有限元模拟分析方法对支挡结构进行优化,实现承载力、变形和经济性的目标。In order to verify the reliability of the three-dimensional finite element method for the optimization design of the foundation pit retaining structure.In this paper,based on MIDAS GTS NX,the three-dimensional finite element analysis of the retaining structure model of the foundation pit is carried out to simulate the excavation in stages and establish the lateral support in time.After the excavation is completed,the ground overload is applied in five stages.Through analysis,the surface deformation at the edge of the foundation pit,the displacement of the retaining structure,the internal force and deformation of the main components such as vertical row piles,transverse waist beams and transverse supports are obtained.Then,the laboratory test of the whole process of the retaining structure model from pre-embedding,excavation and loading was carried out.During the test,the surface deformation of the measuring points at the edge of the foundation pit after excavation and loading at all levels was measured,and the stress and deformation of the baffle,row pile,waist beam and support were observed.Then,the numerical analysis is compared with the experimental results.The larger deformation of the wall panel is the middle area of the two columns of support,and the upper part is large and the lower part is small.The internal forces of wall panels,waist beams and supports in the simulation analysis reflect the actual stress of the components,and the components can be optimized according to the analysis results.In the simulation analysis,the error between the surface deformation and the test results is small,which is basically consistent with the actual surface deformation law.The results of numerical three-dimensional simulation analysis of foundation pit supporting structure are credible and can be used for the optimization design of foundation pit supporting structure.Finally,the finite element simulation analysis method is used to optimize the retaining structure to achieve the goal of bearing capacity,deformation and e

关 键 词：三维有限元分析 支挡结构 变形 内力 优化设计 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]