摘要
富水粉细砂地层中的隧道大断面施工,需要施作超前水平旋喷桩护壳及掌子面超前核心土旋喷桩加固后才能保证安全开挖,因此确保水平旋喷桩桩身质量十分重要。采用低应变反射波法对掌子面上台阶5根水平试验桩的波形进行分析、解译,检测了桩身有无断桩、缩颈、离析等缺陷及相应缺陷的位置,并与开挖后桩体质量对比,证明应用低应变反射波法进行隧道内水平旋喷桩桩身完整性检测是一种快速、无损的方法,且其检测结果可靠。
When large cross-section tunnels are excavated in water-rich fine silty sand ground, advance horizontal jet grouting pipes are needed to reinforce the tunnel face so as to ensure safe excavation. Therefore, it is very important to ensure the quality of the horizontal jet grouting piles. The quality of 5 horizontal jet grouting piles installed in the top heading of a tunnel is detected by low strain reflection wave method. The detection results are compared with the actual quality of the piles exposed, which demonstrates that the low strain reflection wave method adopted is a fast, reliable and nondestructive quality-detection mehtod.
出处
《隧道建设》
2013年第1期27-32,共6页
Tunnel Construction
基金
铁道部科技研究开发计划重大课题(2011G004)
关键词
低应变反射波
水平旋喷桩
质量检测
low strain reflection wave method
horizontal jet grouting pile
quality detection
