盾构隧道纵向变形引起的横向效应

Effect of Longitudinal Deflection on Shield Tunnel Convergence

摘要:

提出了隧道纵向变形对横断面的影响机理可以分为横断面压扁效应和纵向剪切传递效应,并针对典型的盾构隧道纵向变形曲线，分析了压扁效应与纵向剪切传递效应对隧道横向受力、变形的影响特点.结果表明：隧道纵向变形过程中，纵向剪切传递效应和压扁效应共同作用使隧道产生横向附加变形和受力；在通常情况下，纵向剪切传递效应产生的隧道横断面变形与受力强于压扁效应，但是随着隧道纵向变形的增加，压扁效应的作用也逐渐变得显著，在设计中应当进行考虑.

Abstract:

The effect of longitudinal deflection on shield tunnel convergence was studied through longitudinal shear transfer and circumferential flattening. Taking the typical deflection pattern of shield tunnel as example, the effects of flattening and longitudinal shear transfer on tunnel convergence and internal forces were analyzed and compared, respectively. The results indicate that the internal forces and tunnel convergence induced by the longitudinal transfer effect are normally larger than that induced by the flattening effect. However, the effect of flattening on tunnel convergence is not ignorable with the increase of tunnel settlement.