煤与瓦斯突出过程中煤体破坏的有限元模拟

Finite element simulation of coal body failure in coal and gas outburst process

研究了目前有限元软件难以计算的煤与瓦斯突出过程中煤体破坏问题。采用Python语言对ABAQUS前处理模块进行了二次开发,通过Python脚本程序将煤体网格重新划分,并且插入零厚度黏结单元。利用有效应力原理,与ABAQUS基于摩尔库伦准则的摩擦接触结合,实现了瓦斯压力对煤体影响的仿真。利用黏结单元模拟了煤体裂缝的产生与扩展,以及煤体的突出过程。实际仿真计算结果符合实验规律,证明了有限元二次开发技术可以很好地计算煤与瓦斯突出过程中煤体破坏问题,也为Python的二次开发在其他领域的应用提供了参考和借鉴。

The failure of coal mass in the process of coal and gas outburst,which is difficult to calculate by finite element software at present,is studied in this paper.The pre-processing module of ABAQUS is redeveloped by Python language.The coal mesh is re-divided by Python script program,and the zero-thickness cohesive unit is inserted.According to the principle of effective stress and the friction contact of ABAQUS based on Mohr-Coulomb criterion,the simulation of the influence of gas pressure on coal body is realized.The generation and expansion of coal fracture and the outburst process of coal body are simulated by using the cohesive unit.The actual simulation results conform to the experimental law,which proves that the secondary development technology of finite element method can well calculate the failure of coal mass in the process of coal and gas outburst.And it can also provide a reference to the application of Python secondary development in other fields.