摘要
为研究暗挖拱盖法施工时拱部矢跨比对车站结构的影响,以青岛某地铁车站工程为例,基于有限元分析软件MIDAS GTS,对比分析站台宽度为11 m和13 m两种车站结构下,不同矢跨比对其结构受力与变形的影响。研究结果表明:当矢跨比从0.16增大至0.24时拱部施工阶段拱顶弯矩最大,弯矩先减小后增大,整体结构施工时拱部与直墙交界处弯矩最大;两种跨度的车站弯矩分别减少了42.1%和44.6%;轴力随矢跨比的增大而减小,矢跨比对拱部施工阶段的影响较大;矢跨比对结构变形的影响非常明显,拱顶沉降、拱肩沉降与拱脚净空收敛均减少了1/3左右。在考虑整体结构施工与车站结构合理跨高时,拱部矢跨比越大,结构越合理。
To study the influence of arch rise-span ratio on station structure in underground excavation arch-cover method construction,taking a metro station project in Qingdao as example,based on MIDAS GTS finite element software,the influence of different rise-span ratios on structure stress and deformation are comparatively analyzed,in the case of two station structures with platform width of 11 m and 13 m respectively.Research results show that when the rise-span ratio increases from 0.16 to 0.24,the bending moment of the vault at the arch construction stage is the largest,and the bending moment first decreases and then increases.During the construction of the overall structure,the bending moment at the junction of the arch and the straight wall is the largest,and the bending moments of the station with 11 m and 13 m spans are reduced by 42.1%and 44.6%respectively.The axial force decreases with the increase of the rise-span ratio,and the ratio has a greater influence in the arch construction stage.In addition,the influence of rise-span ratio on structure deformation is evident,and the settlement of the vault,the settlement of the spandrel and the clearance of the arch foot are reduced by roughly 1/3.When considering the overall structure construction and the reasonable station structure span height,larger arch section rise-span ratio corresponds to more reasonable structure.
作者
华福才
雷刚
刘明明
杨林
罗立娜
HUA Fucai;LEI Gang;LIU Mingming;YANG Lin;LUO Lina(Beijing Urban Construction Design&Development Group Co.,Ltd.,100037,Beijing,China;不详)
出处
《城市轨道交通研究》
北大核心
2023年第1期28-32,共5页
Urban Mass Transit
基金
青岛地铁科技创新基金项目(M4-ZH-2020-134)
广东省普通高校重点领域专项课题(2021ZDZX1116)
广东省普通高校创新团队项目(自然)(2022KCXTD052)。
关键词
地铁车站
暗挖施工
拱盖法
拱部矢跨比
metro station
underground excavation construction
arch-cover method
arch rise-span ratio
作者简介
第一作者:华福才,正高级工程师;通信作者:雷刚。
