Influence of Grouting Point Layout Angles on Deformation of Shield Tunnel under Load
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摘要:
针对传统的地层注浆整治盾构隧道横椭圆变形过程中变形恢复可控性差等问题，创新性地开展了囊袋法注浆整治盾构隧道横椭圆变形试验研究，试验采用2种不同的囊袋布设方案. 试验结果分析表明：隧道在注浆点附近产生了竖椭圆变形，且在注浆点附近的附加土压力、隧道直径和挠曲变形变化最大，沿着隧道两端呈现逐渐递减的趋势；等量注浆下，垂直注浆可以更好地整治既有隧道的横椭圆变形，侧底部注浆能在实现隧道的横椭圆变形恢复效果的同时，对隧道进行抬升，有效降低隧道在运行过程中产生的沉降；在隧道侧底部注浆时，囊袋在膨胀过程中，由于受到已建隧道重力的影响，使注浆导致的隧道变形较垂直注浆有所降低，因此，在注浆过程中建议适当加大注浆量，以达到预期的横椭圆变形恢复效果；注浆后囊袋呈现中间宽，两边窄的圆柱体形状，囊袋法注浆能有效限制浆液扩散路径，浆液在囊袋内发生挤密扩散，使隧道局部所受压力迅速增大，横椭圆变形恢复效果显著；在隧道侧部垂直注浆，横椭圆变形恢复效果显著，但注浆压力过大等原因易诱发盾构隧道管片错台等问题，建议在整治盾构隧道横椭圆变形超限时，宜将注浆点布设于隧道侧底部位置即偏离隧道两侧约30°～60°位置.
Abstract:Aiming at the problem of poor controllability of deformation recovery in the process of transverse elliptic deformation of shield tunnel treated by traditional stratum grouting, the experimental study on transverse elliptic deformation of shield tunnel treated by capsular bag grouting was carried out innovatively. Two different capsular bag layout schemes were adopted in the experiment. The analysis of the test results shows that the tunnel has a vertical elliptical deformation near the grouting point, and the additional earth pressure, tunnel diameter and deflection deformation near the grouting point change the most, showing a gradual decreasing trend along the two ends of the tunnel. Under the same amount of grouting, vertical grouting can better control the transverse elliptic deformation of the existing tunnel, and the side bottom grouting can realize the recovery effect of the transverse elliptic deformation of the tunnel while uplifting the tunnel and effectively reducing the settlement of the tunnel during operation. When grouting at the bottom of the tunnel side, due to the influence of the gravity of the built tunnel, the deformation of the tunnel caused by grouting is lower than that caused by vertical grouting during the expansion process of the bag. Therefore, it is suggested to increase the grouting amount appropriately in the grouting process to achieve the expected recovery effect of transverse ellipse deformation. After grouting, the capsular bag presents a cylindrical shape with wide middle and narrow sides. The capsular bag grouting method can effectively limit the slurry diffusion path, and the slurry is squeezed and diffused in the capsular bag, so that the local pressure of the tunnel increases rapidly, and the recovery effect of transverse ellipse deformation is remarkable. Vertical grouting at the side of the tunnel has a significant effect on the recovery of transverse ellipse deformation, but excessive grouting pressure and other reasons can easily induce problems such as dislocation of shield tunnel segments. It is suggested that when the transverse ellipse deformation of the shield tunnel exceeds the limit, the grouting point should be arranged at the bottom of the tunnel side, that is, about 30°～60°away from both sides of the tunnel.
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Key words:
- tunnel engineering /
- shield tunnel /
- bag grouting /
- model test
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图 14 注浆过程中隧道与地层相互作用示意（90°）
Figure 14. Tunnel-stratum interaction in grouting process (90°)
图 16 注浆过程中隧道与地层相互作用示意（120°）
Figure 16. Tunnel-stratum interaction in grouting process (120°)
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