开挖过程中新管幕结构内力数值分析  

Numerical Analysis on Inner Forces of Underground New Tubular Roof Structure during Excavation

作　　者：阎石[1] 张占军[1] 金春福[1,2] 卢静丽 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]大连理工大学建设工程学部,辽宁大连116024 [3]中建二局二公司四分公司,河南洛阳471000

出　　处：《沈阳建筑大学学报（自然科学版）》2011年第6期1064-1069,共6页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金面上项目(10972144);2009年度沈阳大型仪器设备共享服务专项基金项目(090079);住房和城乡建设部科学技术项目(2008-K4-39)

摘　　要：目的为有效控制沉降,提高新管幕结构施工安全和进度,研究在开挖过程中新管幕结构的内力传递路径和内力分布情况.方法运用弹塑性理论和有限差分软件FLAC3D,进行三维建模并根据实际施工步骤进行新管幕结构体系非线性仿真分析.结果得到新管幕结构在不同开挖阶段的受力特征、传力路径和分布规律.结论在土体开挖过程中,环梁最大主压应力最开始出现在与第一步开挖土体地面相邻处,然后也由上向下移动,随后出现在中板的部位,最后最大主压应力出现在中板稍下方的地方.底板截面下部的最大主压应力比上部大.To control settlement effectively and improve construction safety and project progress of the new tubular roof（NTR）,the transmission path and the distribution for the internal forces during the excavation were studied and analyzed.Based on the elastic-plastic theory and the finite difference software FLAC3D,a three-dimensional model is built and a nonlinear simulation analysis is made by the actual construction steps.The results of the numerical simulation show that internal force transmission path and internal force distribution for the NTR structure are nonlinearly changed during the construction.The maximum principal stress location of the ring beams begins to appear in the section of the structure near the bottom plane of the first excavated soil,and then moves downward from the previous position and appears in the intersection of middle plate and the ring beams.Finally,it stays in the position slightly below the intersection.Otherwise,the principal compression stress for the bottom plate in the cross section in the lower part is greater than that in the upper part.

关 键 词：新管幕结构 开挖过程 结构内力 仿真分析 

分 类 号：TU931[建筑科学—结构工程] TU745.3