摘要
地铁隧道施工会对周围地层产生扰动,引起周围地层应力的释放和调整,从而导致相邻建筑物的不均匀沉降和倾斜,严重时甚至出现失稳和坍塌,造成重大损失。文章以杭州地铁3号线隧道穿越某新建中学的盾构施工为研究对象,利用有限元软件MIDAS GTS/NX,建立考虑隧道-土-锚杆-桩-建筑物相互作用的三维有限元模型,并通过三维数值模拟分析双线地铁隧道同向盾构施工引起的地层变形特性及基础与建筑物工作性状变化的规律。结果表明:盾构施工引起的地层、基础和建筑物变形较小;盾构施工前后,隧道附近桩基和锚杆的内力变化较大,建筑物梁柱构件的内力变化较小;建筑物的变形与稳定性均在安全范围内。
Underground tunnel construction disturbs the surrounding strata,causes the release and adjustment of the surrounding strata stress,resulting in the uneven settlement and inclination of adjacent buildings,and even instability and collapse,resulting in heavy losses.This paper takes the shielding of Hangzhou metro line 3 tunnel passing through a newly built middle school as the research topic,and uses the finite element software MIDAS GTS/NX,it establishes a three-dimensional finite element model considering the interaction of tunnel soil anchor pile building,and analyzes the ground deformation characteristics caused by shielding in the same direction of double line underground tunnel and the variation rules of working characteristics of foundation and building by three-dimensional numerical simulation.The results show that the deformation of stratum,foundation and building caused by shield construction is small,before and after shield construction,the internal force of pile foundation and anchor rod near the tunnel changes greatly,while the internal force of beam and column components of buildings changes little,the deformation and stability of buildings are within the safety allowance.
出处
《现代城市轨道交通》
2021年第4期49-55,共7页
Modern Urban Transit
基金
国家自然科学基金面上项目(51878605)。
关键词
地铁
双线隧道
盾构施工
数值分析
桩基础
建筑物
沉降变形
metro
double track tunnel
shield construction
numerical analysis
pile foundation
building
settlement deformation
