土钉支护有限元计算方法研究

本文针对上钉支护，尝试用一种新的视土钉为外力的有限元模型进行分析，模型中只出现上体单元、不另外设计土钉及土钉与土的界面单元，将土钉对土体的作用模拟成外力加在土骨架上，假定土钉与土体变形协调，通过反复的数值叠代，最终得出土钉的内力及边坡的变形．应用这一方法使程序的编制、使用等各方面都变得简单，计算量也大大减少。避免了构造界面单元等复杂工作。本文应用这一方法编制了程序，并使用这一程序对某工程实测进行计算，将计算结果与实测结果进行比较，两者吻合很好。证明这一计算方法用于土钉计算是简便可行的。

FINITE ELEMENT MODELLING OF SOIL NAILING REINFORCEMENT

A new three-dimensional finite element model is developed for analysis of soil nailing. Various finite element methods for soil nailing analysis are examined. It is found that most methods are difficult to use and inaccurate results may be produced. In the new finite element method, no nail element emerges when sideslope is calculated. The tension of nail is regarded as internal force. The internal force is applied to the soil element. The nail force and the displacement of sideslope are obtained through iteration An example is provided to verify the proposed method. Comparison is made between the finite element results and the experimental data. Very good agreement is reached, showing that the present method is effective and convenient.