深基坑围护结构表面应变及中性点位置分析  

Analysis of Surface Strain and Neutral Point Position of DeepExcavation Retaining Structure

作　　者：章有政 马学宁[2] ZHANG Youzheng;MA Xuening(Shanxi Transportation Survey&Design Institute Co.,Ltd.,Taiyuan,Shanxi 030032,China;Lanzhou Jiaotong University,Lanzhou,Gansu 730070,China)

机构地区：[1]山西省交通规划勘察设计院有限公司,山西太原030032 [2]兰州交通大学,甘肃兰州730070

出　　处：《山西交通科技》2023年第5期49-52,共4页Shanxi Science & Technology of Transportation

摘　　要：依据哈尔滨至牡丹江客运专线出口明挖段基坑围护结构现场监测结果,结合平面杆系结构法对围护结构受力及变形进行分析。现场通过安置表面应变计和位移钉对基坑整体受力及变形进行监测。由于表面应变计是开挖完毕后立即安设,故开挖瞬时释放应变无法测出,进行第二阶段开挖时,通过提前安设的表面应变计分析围护结构的受力形式及确定中性点的位置,间接确定围护结构开挖过程中的受力特性。According to the field monitoring results of the excavation retaining structure in the open⁃cutting section at the exit of Harbin–Mudanjiang Railway,this paper analyzed the stress and deformation of the retaining structure by the plane rod system structure method.The surface strain meter and displacement nail were arranged in the field to monitor the overall stress and deformation of the excavation.Because the surface strain meter was immediately installed after the excavation was completed,the instantaneous release strain of the excavation cannot be measured.In the second excavation stage,the stress form of the retaining structure was analyzed and the neutral point position was determined by the surface strain meter,indirectly reflecting the stress characteristics of the retaining structure in the excavation process.

关 键 词：深基坑 现场监测 表面应变 平面杆系结构 中性点 

分 类 号：U412.222[交通运输工程—道路与铁道工程]