摘要
依托某市新建地铁3号线盾构隧道工程,通过数值模拟计算,基于土舱压力和注浆压力,研究新建盾构隧道下穿施工对既有地铁5号线隧道结构变形的影响,并提出变形控制措施。研究结果表明,当地铁3号线隧道左线盾构机到达既有地铁隧道正下方区域和右线盾构机掘进完成时,随着压力比的增大,既有地铁5号线隧道拱顶竖向位移分别逐渐增大和逐渐减小,而随着注浆压力的增大,既有地铁5号线隧道拱顶竖向位移均基本减小。宜将土舱压力控制为1.0~1.2倍静止土压力,注浆压力控制为0.64~1.00MPa。从施工成本和加固效果角度考虑,宜将二次深孔注浆作为合理的加固方式。
Based on the shield tunnel project of a newly built Subway Line 3 in a certain city,numerical simulation calculations were conducted to study the impact of the construction of the new shield tunnel underpass on the structural deformation of the existing Subway Line 5 tunnel,based on soil chamber pressure and grouting pressure,and deformation control measures were proposed.The research results show that when the left line shield machine of Subway Line 3 tunnel reaches the area directly below the existing subway tunnel and the right line shield machine completes excavation,the vertical displacement of the existing Subway Line 5 tunnel arch gradually in creases and decreases with the increase of pressure ratios,however,with the increase of grouting pressure,the vertical displacement of the existing Subway Line 5 tunnel arch is basically reduced.It is advisable to control the soil chamber pressure at 1.0~1.2 times the static soil pressure,and the grouting pressure at 0.64~1.00MPa.From the perspective of construction cost and reinforcement effect,the secondary deep hole grouting reinforcement method should be considered as a reasonable reinforcement method.
作者
牛自强
NIU Ziqiang(China Railway 12th Bureau Group Co.,Ltd.,Taiyuan,Shanxi 030024,China)
出处
《施工技术（中英文）》
CAS
2024年第21期78-83,共6页
Construction Technology
关键词
地铁
隧道
盾构
土舱压力
注浆压力
变形控制
subways
tunnels
shields
soil chamber pressure
grouting pressure
deformation control
