摘要
基于三维非线性有限元数值分析方法,全过程模拟南宁市轨道交通1号线佛子岭站~火车东站区间双线下穿北昆输油管线盾构施工过程,并通过与实测数据的对比分析,揭示了施工过程中输油管线的竖向位移及应力变化规律。研究结果表明,输油管线的沉降形状基本符合盾构施工后土体的Peck正态分布曲线;在临近左线隧道正上方输油管线施工时,输油管线的沉降变化速率最快;右线盾构施工对右线隧道正上方输油管线的影响较左线隧道正上方输油管线大;对输油管线的应力影响也集中体现在输油管线正下方的盾构施工过程中。因此,在盾构施工临近输油管线正下方时,应适当加快衬砌速度,加强临近土层竖向位移监测,保障盾构施工安全。
Based on the three-dimensional nonlinear finite element numerical analysis method,the entire process of shield tunneling construction for the double track underpass of the Beikun oil pipeline in the section from Foziling Station to East Railway Station of Nanning Rail Transit Metro Line 1 was simulated.By comparing and analyzing with measured data,the vertical displacement and stress changes of the oil pipeline during the construction process were revealed.The research results indicate that the settlement shape of the oil pipeline basically conforms to the Peck normal distribution curve of the soil after shield tunneling construction;when constructing the oil pipeline directly above the left tunnel,the settlement rate of the oil pipeline is the fastest;the impact of shield tunneling on the oil pipeline directly above the right tunnel is greater than that on the oil pipeline directly above the left tunnel;the stress impact on the oil pipeline is also concentrated in the shield tunneling construction process directly below the oil pipeline.Therefore,when shield tunneling construction is located directly below the oil pipeline,the lining speed should be appropriately accelerated,and the vertical displacement monitoring of adjacent soil layers should be strengthened to ensure the safety of shield tunneling construction.
作者
朱清利
ZHU Qingi(China Railway 20th Bureau Group 3rd Engineering Co.Ltd.,Chongqing 400065,China)
出处
《铁道建筑技术》
2024年第3期158-161,共4页
Railway Construction Technology
基金
中铁二十局集团有限公司科技研发项目(YF2203SD15B)。
关键词
双线盾构
输油管线
有限单元法
沉降
应力
double line shield construction
oil pipeline
finite element method
settlement
stress
