基于水平旋喷桩处置优化的地铁隧道施工变形控制分析
Analysis of Deformation Control During Subway Tunnel Construction Based on Optimization of Horizontal Rotary Jet Grouting Pile Disposal
王立新 1高洋 2汪珂 1李储军 3邱军领2
作者信息
- 1. 中铁第一勘察设计院集团有限公司,陕西 西安 710043;西安理工大学 土木建筑工程学院,陕西 西安 710048
- 2. 长安大学 公路学院,陕西 西安 710064
- 3. 中铁第一勘察设计院集团有限公司,陕西 西安 710043
- 折叠
摘要
为研究富水砂层隧道中水平旋喷桩+超前小导管组合预加固的效果,以青岛地铁某区间段隧道为依托,采用有限元数值模拟方法,对比分析了无预加固、单独使用水平旋喷桩及旋喷桩配合超前小导管组合预加固三种工况的加固效果.结果表明,与无预加固方案相比,单独使用水平旋喷桩预加固可使地表沉降、拱顶沉降、掌子面纵向位移分别相应减少约 61%、59%、38%;而水平旋喷桩与超前小导管组合预加固方案可使地表沉降、拱顶沉降、掌子面纵向位移分别相应减少约66%、77.6%、38.9%,典型开挖断面处与拱脚处地下水渗流量分别减少 93.4%、96.7%,预加固效果与止水效果显著.
Abstract
In order to study the effect of horizontal rotary jet grouting pile plus advanced small pipe combination pre-reinforcement in the rich water sand layer tunnel,based on a section of the Qingdao Metro tunnel,the finite element numerical simulation method was used to compare and analyze the rein-forcement effect of three working conditions:non-pre-reinforcement,using horizontal rotary jet grouting pile alone,and rotary jet grouting pile combined with advanced small pipe combination pre reinforce-ment.The results show that compared with the non-pre-reinforcement scheme,the use of horizontal ro-tary jet grouting pile pre-reinforcement alone can reduce surface settlement,arch settlement,and lon-gitudinal displacement of the palm face by about 61%,59%,and 38%,respectively.The combination of horizontal rotary jet grouting pile and advanced small conduit pre reinforcement scheme can reduce surface settlement,arch crown settlement,and longitudinal displacement of the palm face by about 66%,77.6%,and 38.9%,respectively.The groundwater seepage flow at typical excavation sections and arch feet can be reduced by 93.4% and 96.7%,respectively.The pre-reinforcement effect and wa-ter stop effect are significant.
关键词
水平旋喷桩/富水砂层/数值模拟/止水效果/预加固Key words
horizontal jet grouting pile/water-rich sand/numerical simulation/effect of water stop/pre-reinforcement引用本文复制引用
基金项目
国家自然科学基金资助项目(52078421)
陕西省特支计划青年拔尖人才项目(陕组通字[2018]33号)
中铁一院科研项目(院科19-75-01)
出版年
2024
NETL
NSTL
万方数据