中国铁道科学2012，Vol.33Issue(2)：48-53,6.DOI:10.3969/j.issn.1001-4632.2012.02.09
盾构始发负环管片和反力架拆除时机的影响因素分析
Analysis on the Influence Factors of the Demolition Timing for Negative Ring Segments and Reaction Frame during Shield Originating
摘要
Abstract
The software FLAC3D was used to simulate shield originating engineering of 01 bid section of Daxing Line Beijing Metro and that of general metro respectively. The relationship between the horizontal displacement of negative ring segments and the number of assembling segments was analyzed. The demolition timing for negative ring segments and reaction frame as well as their influence factors were then investigated. It is found that the horizontal displacement of negative ring segments goes through four stages, namely, initial growth stage, rapid growth stage, slow growth stage and stability stage, along with the number of assembling segments increasing. The negative ring segments and reaction frame on longer bear shield thrust when the horizontal displacement is in the stability stage, and it is the best timing for the demolition of negative ring segments and reaction frame. The factors such as friction coefficient, buried depth of tunnel and the outer diameter of negative ring segment affect the horizontal displacement of negative ring segments significantly. With the increase of friction coefficient or buried depth of tunnel, the horizontal displacement decreases gradually, and the degree of influence is faded down. The horizontal displacement decreases gradually with the outer diameter of segment increasing, but the degree of influence is enhanced gradually.关键词
地铁/隧道工程/盾构始发/负环管片/反力架/拆除时机/水平位移Key words
Metro/ Tunnel engineering/ Shield originating/ Negative ring segment/ Reaction frame/ Dem-olition timing/ Horizontal displacement分类
交通工程引用本文复制引用
李涛,刘波,江玉生,黄杰..盾构始发负环管片和反力架拆除时机的影响因素分析[J].中国铁道科学,2012,33(2):48-53,6.基金项目
国家自然科学基金资助项目(50974126) （50974126）
教育部科学技术研究重点项目(109034) （109034）
教育部新世纪优秀人才支持计划项目(NCET-08-0835) （NCET-08-0835）
中央高校基本科研业务费专项资金(2009QL02) （2009QL02）
博士学科点专项科研基金资助项目(新教师类)(20100023120003) （新教师类）
