地铁隧道近接下穿城市沉降敏感区影响及优化分析
Influence and Optimization Analysis of Subway Tunnels Close to and Under the Settlement Sensitive Area
王万锋 1陈宇华 2赵凯 2邹祯祥 2邱军领 2杨桃3
作者信息
- 1. 中铁建云南投资有限公司,云南 昆明 650200
- 2. 长安大学 公路学院,陕西 西安 710064
- 3. 四川都金山地轨道交通有限责任公司,四川 成都 611830;四川蜀道新制式轨道集团有限责任公司,四川 成都 610023
- 折叠
摘要
为研究地铁盾构下穿城市中沉降敏感地区时的沉降特性,基于地铁盾构隧道下穿加油站工程实例,建立三维有限元模型,得到盾构隧道近接加油站过程中地表以及油罐的沉降分布曲线,并进一步通过改变油罐位置,对比分析油罐在不同排列方式下受到隧道开挖的影响.结果表明:在油罐双层布置下,地表沉降随着隧道的掘进而增大,在施工结束后最大沉降达到11.48 mm,靠近左线隧道一侧;油罐在隧道施工的扰动下,其最大沉降达到 2.85 mm.油罐单层排列相较于双层布置,油罐的最终沉降减少至2.68 mm;油罐的上下侧的最大沉降差减少了38%,同时油罐表面测点的沉降变化率减少了41%,安全性大幅提升.
Abstract
To study the settlement characteristics of subway shield tunneling passing through settlement sensitive areas in cities,a three-dimensional finite element model is established based on the example of subway shield tunneling passing through gas stations.The settlement distribution curves of the ground and oil tanks during the process of shield tunneling approaching gas stations are obtained.Furthermore,by changing the position of oil tanks,the influence of tunnel excavation on oil tanks under different a-rrangement modes is compared and analyzed.The results show that under the double-layer arrangement of oil tanks,surface settlement increases with the excavation of the tunnel,and the maximum settlement reaches 11.48 mm after construction is completed,close to the left side of the tunnel.Under the dis-turbance of tunnel construction,the maximum settlement of the oil tank reached 2.85 mm.Compared to the double-layer arrangement,the final settlement of oil tanks is reduced to 2.68 mm in the single-layer arrangement.The maximum settlement difference between the upper and lower sides of the oil tank has been reduced by 38%,and the settlement change rate of the surface measurement points of the oil tank has been reduced by 41%,significantly improving safety.
关键词
盾构隧道/近接加油站/沉降特性/安全影响/数值分析Key words
shield tunnel/close to the gas station/settlement characteristics/safety impact/numeri-cal analysis引用本文复制引用
基金项目
中铁建昆仑投资集团重点研发项目(KLTZ-KX01-2020-009)
陕西省重点研发计划资助项目(2023-YBSF-511)
出版年
2024
NETL
NSTL
万方数据