摘要
盾构法广泛应用于我国城市轨道交通隧道的建设中,盾构管片的病害问题也越发受到重视。文章针对某地铁在建盾构隧道突发管片破损病害,绘制了管片破损病害展布图,分析了相关资料和检测数据,明确了病害的成因机理,制定并实施了相应治理措施。研究结果表明:管片背后大范围空洞导致围岩对隧道的约束不足,引起已成型隧道在盾构机反推力和扭矩、同步注浆浆液浮力、刀盘水土压力和扭矩等作用下发生类压杆弯扭失稳是导致该病害的主要原因;隧道变形监测数据表明"背后注浆填充+破损部位修复"两阶段治理措施取得了良好的治理效果;盾构隧道施工过程中,应严格管控同步注浆质量,防止隧道轴线偏移引起盾构管片发生开裂破损等病害。
The shield construction method has been widely used in the construction of urban rail transit tunnels in China, and the problem of failures in shield tunnel segments has also been attracting increasing attention. This paper draws a development map of the segment damage failures based on the sudden segment damage event in a shield tunnel under construction, analyzes the relevant documentation and test data, clarifies the cause mechanism of the failures, formulates and implements corresponding treatment measures. The analysis results show that extensive cavities behind the segment lining would lead to the insufficient constraint on the tunnel structure by the surrounding rocks, and further cause the bending-torsion failure similar to the compression rod structure when the formed tunnel is subject to the action of the thrust and torque of the shield machine, the buoyancy of the synchronous injection grouts, as well as the soil and water pressure and torque of the cutterhead, which is the main cause of the segment damage failure;The monitored tunnel deformation data show that the two-stage treatment measure of "backfill grouting + repair of damaged parts" could achieve good results. In the process of shield driving, the quality of synchronous grouting should be strictly managed to prevent the shield tunnel segment cracking and fracturing failures induced by deviation from the tunnel axis.
作者
贺蕾铭
邓非凡
贾鹏
HE Leiming;DENG Feifan;JIA Peng(PowerChina Railway Construction Investment Group Co.,Ltd,Beijing 100160;China Railway Southwest Research Institute Co.,Ltd.,Chengdu 611731;China Railway Chengdu Rail Transit Health Management Technology Co.Ltd,Chengdu 611731)
出处
《现代隧道技术》
CSCD
北大核心
2022年第1期225-231,共7页
Modern Tunnelling Technology
关键词
地铁盾构隧道
管片破损
成因分析
治理措施
Metro shield tunnel
Segment damage
Causes analysis
Treatment measures
