盾构管片接头三维数值模拟与研究

盾构管片接头作为管片分块的连接部分,是盾构管片结构中的重要且薄弱的局部结构,其力学性能直接影响盾构管片正常运营的安全性。利用三维有限元方法建立了精细化的三维数值模型,采用实体单元模拟了铸铁件管片接头、螺栓、垫片等结构,计算了螺栓表面荷载下管片接头的力学性能和锚筋支座反力,通过3组螺栓位置情况讨论分析了锚筋位置对管片接头结构力学性能以及锚筋支座反力的影响。数值计算结果说明三维有限元法能有效的计算和分析盾构管片接头的力学性能,锚筋位置的改变能明显的影响锚筋支座反力。

Three-dimensional Numerical Simulation and Research on Segmental Joint of Shield

The segmental joint of shield is the connecting part of segments, and is the key and weak parts of the shield. Its mechanical properties will directly affect the safety of the normal operation of shield segment. The 3D finite element method is used to establish a refined three-dimensional numerical model. The solid element is used to simulate the joint, bolt gasket and other structures of iron casting segment. The mechanical properties and anchor bar support reaction force of segmental joint under the bolt surface load are calculated. The influence of the anchor bar position on the structural mechanical properties and anchor bar support reaction force of segmental joint is discussed and analyzed through three groups of bolt position. The numerical calculation results show that the three-dimensional finite element method can effectively calculate and analyze the mechanical properties of the shield segmental joint, and the change of anchor bar position can obviously affect the reaction force of the anchor bar support.