一次扣拱暗挖逆作施工过程基底受力分析  

Foundation Stress Analysis of the Construction Process with Top-Down Boring with Cast-in-Situ Arch

作　　者：刘华政[1] 戚承志[1] 丁德云 

机构地区：[1]北京建筑大学土木与交通工程学院工程结构与新材料北京市高校工程研究中心,北京100044 [2]北京城建设计发展集团股份有限公司,北京100037

出　　处：《北京建筑工程学院学报》2014年第2期22-26,31,共6页Journal of Beijing Institute of Civil Engineering and Architecture

基　　金：国家十二五科技支撑计划课题资助(2012BAJ01B01);北京市属高等学校创新团队建设与教师职业发展计划项目(IDHT20130512);北京市自然科学基金(KZ200810016007)

摘　　要：一次扣拱暗挖逆作法作为一种新的地铁车站施工方法在工程中越来越多地被采用.然而对于施工过程中基底应力变化历程尚不清楚.以北京地铁14号线大望路站为背景,采用二维有限元分析法,模拟车站采用一次扣拱暗挖逆作法施工过程,分析基底应力的变化.研究表明:一次扣拱暗挖逆作地铁车站施工过程中,随着施工步骤的进行,基底最大竖向应力逐步减小,在施工的最后阶段出现显著增加.随着深度的增加,各施工步骤的基底最大竖向应力增大,由此得出的一些规律可以为实际工程承载力设计提供一定的参考.Top-down boring with cast-in-situ arch is increasingly being adopted as a new subway station construction method in the project. However,the process of stress change is unclear in the course of the construction. By taking Dawanglu Station of Beijing metro No. 14 line as engineering background,the station construction process is simulated by mean of two-dimensional finite element method. The change of stress on the bottom of the basis is analyzed. The numerical results show that the value of the stress is reducing with the increase of depth in the process of the subway station construction,however,the stress is increased significantly at the final stages of construction. With the increase of depth,the basis vertical maximal stress of the construction steps increases. Some conclusions can provide certain reference for vertical component bearing capacity in actual engineering design.

关 键 词：一次扣拱暗挖逆作法 地铁车站 施工过程 

分 类 号：TU43[建筑科学—岩土工程] TU45[建筑科学—土工工程]