Flac3D单元等效结点力的计算与应用研究

Study on Calculation and Application of Equivalent Nodal Force in Flac3D Element

针对Flac3D无法直接输出单元等效结点力的不足,采用虚位移原理和虚功等效原则,在建立单元形函数和应变刚度矩阵的基础上,推导了Flac3D单元等效结点力的计算公式,编写了相应计算机程序,并通过单轴压缩模拟试验算例验证,得到了满意的结果.该方法能够为岩体开挖能量释放率计算和深部岩体岩爆分析提供有效途径.

In order to cover the shortage that element equivalent nodal force can＇t be put in Flac3D, principles of virtual displacement and virtual work were adopted to derive a set of computing formula for equivalent nodal force in Flac3D element based on building element shape function and strain stiffness matrix of element. Hereby, a corresponding computer program was written. A checking example about uniaxial compression test showed that the result was satisfactory. The method provided an effective way to calculate energy release rate of excavating rockmass and to analyze rockburst of deep rockmass.