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本文针对不设传力衬垫的盾构管片接头的罚函数接触算法和节理单元模型中的控制性参数-法向接触刚度和法向弹簧刚度的取值原则问题进行了相关研究,研究表明:法向弹簧刚度取值过小,将导致引入的计算误差过大,同时,取值也不能太大,更不能取为无穷大,以避免引起方程组病态而导致计算结果失真;弹簧类模型所引起的计算误差在理论上不可能完全消除;Lagrange Multiplier接触算法可完全消除弹簧类型模型引入的计算误差,但计算结果与试验结果相差较大;接头承受轴力越小,则Lagrange Multiplier接触算法计算结果与试验结果相差越大。同时,Lagrange Multiplier接触算法不能解释转动刚度与轴力关联现象。
In this paper, we study the penalty function contact algorithm of shield pipe joints without force transmission liner and the control parameter of normal joint model, which is normal contact stiffness and normal spring stiffness. The research shows that : Normal spring stiffness value is too small, will lead to the introduction of the calculation error is too large, at the same time, the value can not be too large, but can not be taken as infinity, in order to avoid causing ill-conditioned equations lead to the calculation results distortion; The calculation error caused by the Lagrange Multiplier contact algorithm can completely eliminate the calculation error introduced by the spring type model, but the difference between the calculated result and the experimental result is larger. The smaller the joint axial force is, the Lagrange Multiplier contact algorithm calculates The result is different from the test result. At the same time, Lagrange Multiplier contact algorithm can not explain the relationship between rotational stiffness and axial force.