摘要
杭州地铁3号线盾构隧道超近距离侧穿高架桥桩基盾构掘进过程中,存在桩基偏位、桥梁结构变形过大等安全隐患,采用土体移动模型的理论计算法和Midas GTS软件模拟盾构隧道施工过程,对盾构推进过程中上覆地层沉降、超近距离桩基偏移倾斜变化规律进行计算分析。研究表明,左线或右线隧道单独开挖,隧道拱顶及以上地表产生最大沉降,并向两侧依次递减,沉降的理论计算值与数值模拟结果相近;双线隧道开挖完成后最大沉降发生在两隧道之间以上地表位置;左右线隧道的先后开挖引起中间排桩基左右摆动偏移;刀盘推进参数和掌子面距桩基的距离是影响桩基偏位的主要因素;盾壳围岩间隙、管片后二次注浆材料强度等对地层变形产生一定程度的影响,并间接对桩基的倾斜度产生影响。
The security problems such as misalignment of the pile foundation and excessive deformation of the bridge are existed during the excavation of the shield tunnel of the Hangzhou Metro Line 3 at a very close distance to cross the viaduct pile foundation shield.The theoretical calculation method of soil movement model and the numerical simulation method of Midas GTS soft were used to calculate the construction of shield tunnels,and the ground settlement and pile foundation inclination during shield construction were analyzed.The results showed that,when the left or right line tunnels were excavated separately,the maximum settlement occurred at the tunnel vault and above the ground surface,and the settlement would gradually decrease to both sides.The theoretical calculation of the settlement was similar to the numerical simulation;after the completion of the excavation of the two-line tunnel,the maximum settlement occurred at the surface position between the two tunnels;the excavation of the left and right line tunnels caused the left and right swing excursion of the middle row pile foundation;the cutter parameters and the distance between the tunnel face and the pile foundation were the main factors affecting the deviation of the pile foundation;in addition,the shield and rock mass gap,the strength of the secondary grouting material after the segment affect the ground deformation to a certain extent,and indirectly affect the gradient of the pile foundation.
作者
刘涛
杨克形
姜磊
黄旭峰
高瑞
刘世奇
LIU Tao;YANG Kexing;JIANG Lei;HUANG Xufeng;GAO Rui;LIU Shiqi(The Third Engineering Co.,Ltd.,China Railway Seventh Group,Xian 710043,Shaanxi,China;Civil Engineering and Architecture,Zhejiang University of Technology,Hangzhou 310012,Zhejiang,China)
出处
《隧道与地下工程灾害防治》
2020年第1期61-67,共7页
Hazard Control in Tunnelling and Underground Engineering
基金
中铁七局科研资助项目(20190715)
关键词
盾构
超近距离
地层沉降
桩基变位
仿真分析
shield
closely distance
ground settlement
deformation of the pile
simulation analysis
作者简介
第一作者:刘涛(1987—),男,陕西咸阳人,工程师,主要研究方向为地铁工程科研和施工技术管理.E-mail:103336306@qq.com;通信作者:杨克形(1996—),男,浙江温州人,硕士研究生,主要研究方向为隧道工程理论与实验研究.E-mail:ykx@zjut.edu.cn
