摘要
依托广州地铁18号线沙溪站~石榴岗站区间风化泥质粉砂岩地层盾构始发工程,基于有限元理论研究负环管片的拆除时机及其影响因素。结果表明:掘进距离达123m,即管片环数达77环时,盾构推力对负环管片的影响很小,此时拆除负环管片是安全的;随着摩擦系数、隧道埋深和管片外径增加,满足拆除负环管片的最小掘进距离呈指数关系减小,且这三个因素的影响随参数值的增大逐渐减弱;负环管片拆除时机主要与零环管片轴向位移和管片摩擦力有关,实际工程中需要综合考虑上述两方面因素判断负环管片的拆除时机。
Relying on the initiation of the shield tunnel in the weathered argillaceous siltstone stratum of Shaxi Station to Shiliugang Station on Line 18 of Guangzhou Metro,the timing of the removal of the negative ring segment and its influencing factors are studied based on the finite element theory.The results show that when the digging distance reaches 123 m,that is,the number of ring segments reaches 77,the shield thrust force has little effect on the negative ring segment.At this time,it is safe to remove the negative ring segment.With the increase of the friction coefficient,the tunnel buried depth and the outer diameter of the segment,the minimum driving distance required to remove the negative ring segment decreases exponentially,and the influence of these three factors gradually decreases with the increase of the parameter value;the timing of the removal of the negative ring segment is mainly related to the displacement and the friction of the segment.It is necessary to comprehensively consider the above two factors to determine the timing of the removal of the negative ring segment.
作者
陆志明
曹军军
王新强
黄杰
晏启祥
LU Zhiming;CAO Junjun;WANG Xinqiang;HUANG Jie;YAN Qixiang(MOE Key Laboratory of Transportation Tunnel Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Construction Bridge Engineering Bureau Group Co.,Ltd.,Tianjin 300300,China)
出处
《建筑结构》
CSCD
北大核心
2020年第S01期1132-1137,共6页
Building Structure
关键词
地铁
盾构始发
数值计算
负环管片拆除
曲线拟合
风化泥质粉砂地层
subway
shield launching
numerical calculation
removal of negative ring segment
curve fitting
weathered silty silt formation
作者简介
陆志明,硕士研究生,Email:1181761906@qq.com。
