摘要
为解决双护盾TBM管片壁后回填豆砾石不及时、回填效果差、灌浆滞后等问题,考虑TBM盾尾的结构形式、与围岩和管片的位置关系,针对性设计一种耐磨、易拆卸、高弹性、封堵效果良好的新型TBM盾尾封堵板,提出豆砾石与底部灌浆同步回填技术,并在青岛地铁6号线某区间进行现场试验,验证该技术的可行性,得到浆液配比、灌浆量、灌浆点位等关键指标。结果表明:1)封堵板的安装能够使豆砾石提前吹填,实现底部同步灌浆;2)采用水灰比为2.3∶5的浆液稠度低于13 cm,能够满足向豆砾石孔隙渗透的要求,又能避免因稠度不足而导致的灌浆过程中的流失;3)灌浆点位建议设在管片4点钟和8点钟(时钟方位)位置,位置过高或过低都容易导致浆液流失。
To address challenges related to untimely gravel backfilling,suboptimal backfilling effects,and delayed grouting behind the double-shield tunnel boring machine(TBM)segment,a novel TBM shield tail sealing plate that is characterized by high wear-resistance,easy assembly,elevated elasticity,and effective sealing is proposed.This design considers the structural mode of the TBM shield tail and its positional relationship with surrounding rocks and segments,facilitating synchronous backfilling of gravel and bottom grouting.To validate the feasibility of this technology,a field test is conducted on a section of Qingdao metro line 6.Primary indices,such as grout mixing ratio,grouting amount,and positions are collected.The results highlight the following key findings:(1)The installation of the sealing plate ensures the advance backfilling of gravel,thereby creating favorable conditions for synchronous bottom grouting.(2)A slurry with a water-cement ratio of 2.3∶5 and a consistency of less than 13 cm is sufficient to meet the gravel grouting requirements.(3)For the lower segment,it is recommended that grouting points be positioned at a 60°angle against the Y-line of the tunnel cross-section to prevent grout overflow.
作者
王守慧
杨星
江玉生
刘泉维
赵继增
朱志敬
邵长志
谭卓林
杨志勇
WANG Shouhui;YANG Xing;JIANG Yusheng;LIU Quanwei;ZHAO Jizeng;ZHU Zhijing;SHAO Changzhi;TAN Zhuolin;YANG Zhiyong(Qingdao Metro Group Co.,Ltd.,Qingdao 266045,Shandong,China;School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;Qingdao Metro Line 6 Co.,Ltd.,Qingdao 266427,Shandong,China;School of Civil Engineering,Shandong University,Jinan 250002,Shandong,China;China Railway No.2 Engineering Group Co.,Ltd.,Chengdu 610031,Sichuan,China)
出处
《隧道建设(中英文)》
CSCD
北大核心
2023年第11期1954-1963,共10页
Tunnel Construction
关键词
地铁
双护盾TBM
管片
豆砾石
灌浆
同步回填
metro
double-shield tunnel boring machine
segment
gravel
grouting
synchronous backfill
