摘要
研究目的:某地铁区间盾构隧道在贯通交付铺轨后,经过对隧道位移多次监测数据的分析得知,隧道结构在水平向及竖直向两个方向上均不同程度的发生位移,沿隧道纵向位移最大值达到19.1 cm,超过规范限值,一定程度上影响隧道的使用功能,通过本研究分析得出漂移原因,同时提出针对性的处理措施。研究结论:(1)经过现场钻孔探查及地质雷达检测发现管片结构与围岩间盾尾间隙注浆不密实,出现不同程度的空洞,地层中地下水渗入,使得区间隧道结构悬浮于填充在盾尾间隙间的过水通道中;(2)隧道在施工荷载或其它随机作用的影响下,纵向刚度不足以抵抗上述作用,隧道结构出现漂移;(3)通过二次压注水泥-水玻璃双液浆,隧道结构盾尾间隙得以重新填充,隧道结构趋于稳定;(4)对应处理措施可应用于类似地铁盾构隧道工程。
Research purposes： The displacement of the subway shield running tunnel both on the horizontal and vertical direction is obtained by analyse of the monitoring data after the tunnel transferred to the track laying contractor, the displacement achieved to 19. l cm, which exceed the code limit and affect the function of the running tunnel. Through the study the reason of the excursion of the tunnel is analyzed and the measures is proposed. Research conclusions： The space between the segment and the surrounding rock is empty after in suit drilling ascertainment and the GRR detect, so the groundwater permeates into the space, then the running tunnel is submerged in the groundwater. Under the influence of the construction load and other stochastic effect, the stiffness of the tunnel on the longitudinal direction is deficient and then the excursion happens. The running tunnel became steady after the space is filled by the secondary double-grout. The measures can be used in the similar tunnel engineering.
出处
《铁道工程学报》
EI
北大核心
2014年第4期113-116,120,共5页
Journal of Railway Engineering Society
关键词
盾构隧道
地铁
漂移
双液浆
shield tunnel
subway
excursion
double - grout
