波纹钢加固盾构隧道结构破坏机制的足尺试验研究

Full-scale Experimental Study on Failure Mechanism of Corrugated Steel Reinforced Shield Tunnel Structure

文章以在具有9 cm收敛变形的盾构隧道上进行波纹钢加固为背景,对超载工况下波纹钢加固盾构隧道结构的力学性能进行了足尺试验研究。具体介绍了试验方案设计,提供了结构变形、界面剪切、界面剥离、波纹钢应变的发展情况和破坏过程等试验结果,并对加固结构的受力特点和破坏机制进行了分析。试验结果表明:波纹钢是一种有效的盾构隧道加固方法。在试验工况下能够承担4.5 m的上覆土增量荷载。波纹钢加固结构的主要破坏原因为波纹钢-管片粘结界面的破坏。界面破坏可分为界面剪切与界面剥离两种类型,均主要发生在转动变形较大的隧道顶部、腰部纵缝附近。

This article presents a full-scale experimental study on the mechanical behavior of a corrugated steel reinforced shield tunnel,which experiences a convergence deformation of 9 cm before the reinforcement and is subjected to overburden conditions.The experimental design is described in detail,and the results is provided including the structural deformation,interface shear displacement,interface radial peeling displacement,corrugated steel strains,and the overall failure process.Based on these experimental findings,the mechanical characteristics and failure modes of the corrugated steel reinforced shield tunnel are analyzed.The experiment demonstrates that corrugated steel is an effective reinforcement method,enabling the tunnel to bear an additional overburden load of 4.5 m.The primary cause of failure in the corrugated steel reinforced tunnel is the debonding between the corrugated steel and the shield tunnel segment.This debonding can be categorized into two types:interface shear failure and interface radial peeling failure.Both types predominantly occur near the longitudinal joints at the top or waist,where significant rotational deformation occurs.