地铁车站与风道交叉段施工力学行为数值模拟分析  

Numerical Simulation Analysis on Mechanical Behavior during Construction at the Intersection of Metro Station and Ventilation Gallery

作　　者：谢顺意[1] 施成华[1] 彭立敏[1] 黄生文[1] 

机构地区：[1]中南大学土木工程学院,湖南长沙410004

出　　处：《铁道标准设计》2012年第6期93-97,共5页Railway Standard Design

摘　　要：以沈阳地铁2号线沈阳北站站车站与风道立体交叉段工程为背景,采用三维有限元方法对车站与风道暗挖洞桩法施工过程进行动态模拟,分析交叉段的地表位移和结构主应力变化规律。计算结果表明:小导洞施工和拱部初衬施工是影响地表沉降的关键工序;施工过程中交叉段地表形成不对称的沉降槽,靠近风道一侧的沉降值较大;交叉处结构应力集中明显,拱顶部位出现上下截面整体受拉的不利受力形式,需要对交叉处周边围岩进行注浆加固,并适当增加拱顶与交叉处混凝土结构厚度与配筋量。In this paper,the grade separation project of the metro station and ventilation gallery of Shenyang Metro line 2 at Shenyang North Railway Station was cited as an example.The construction processes of underground excavation by PBA(pile-beam-arc) construction method at the intersection were dynamically simulated by means of 3D finite element method,and the rules of the ground surface displacements and structural principal stresses were analyzed.The calculation results show that the constructions for the small pilot tunnel and for the arch lining are the key processes affecting surface subsidence;the dissymmetric subsidence of trough-type is formed at the intersection during construction;the subsidence value near the ventilation gallery is bigger;stress concentration is obvious at the intersection,and holistic tension which tends to be of disadvantageous stress-type appears in whole section of the vault.So the surrounding rocks at the intersection should be reinforced,and the steel amount and concrete structure thickness at the vault and at the intersection should be increased appropriately.

关 键 词：地铁车站 风道 立体交叉 洞桩法 施工 数值模拟 

分 类 号：U455[建筑科学—桥梁与隧道工程]