盾构切削钢筋混凝土地连墙的破坏模式及机理研究

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中图分类号：U25文献标识码：A

Analysis of Damage Modes and Mechanisms of Shield Cutting Reinforced Concrete Diaphragm Walls

ZHU Hongyu¹，LIU Wei1*，SHI Peixin’，NIE Hongwei¹，LIANG Jiaxin 2 （1.School of Rail Transportation，Soochow University，Suzhou，Jiangsu 215ooo，China; 2.Collge of Civil Engineering，Taiyuan University of Technology，Taiyuan，Shanxi O3OO024，China）

Abstract： Given the increasing number of cases where shield machines directly cut through reinforced concrete internal walls during urban tunnel construction，in-depth research on the failure mode of the internal wall during the cuting process and the load variation patern of the cutter head is crucial for optimizing the tool configuration and improving construction eficiency.Based on the indoor test of roller cutting through reinforced concrete internal walls，a three-dimensional dynamic numerical model of the shield cuttr head cutting through the reinforced concrete internal wall was established using ABAQUS. The simulation results show that the concrete mainly exhibits britle failure，and the failure mode of the steel bars is greatly influenced by the surrounding concrete constraints.By establishing a quantitative criterion for fracture stress ratio，statistical analysis reveals that the steel bars are partial cut-off，and the proportion of complete breakage decreases with the increase in diameter. The simulation data can basically reflect the average trend of the cutter head load change in the test，with the relative errors of thrust and torque being 7.36% and 9.21% respectively. High penetration depth will cause significant load oscillation，while low penetration depth can better exert the grinding effect of the roler.

Key words： shield cutting；diaphragm wall； steel damage mode； cutterhead load；penetration

随着轨道交通高速发展，地铁网络逐步形成[1]。（剩余11404字）