基于离散元仿真的潜孔锤球齿冲击回转破岩机理研究OA

As the core equipment of impact rock breaking technology,down-the-hole hammer has occupied an important position in various geological drilling projects due to its high energy conversion rate and excellent durability of drilling tools.In recent years,its technological transformation value in the field of emergency rescue drilling has become increasingly prominent.In response to the triple requirements of"timeliness,accuracy and safety薰 in drilling rescue scenario,this study adopts the PFC discrete element method to conduct the correlation research of multi-scale parameters of rocks:Firstly,the micro-mechanical parameter system of the target rock mass is marked through the orthogonal test method,and the numerical model of the"ball tooth-granite薰 impact-rotation coupling rock breaking of pneumatic down-the-hole hammer is constructed;Secondly,from the perspective of energy conversion,analyze the formation mechanism and expansion path of fracture network during rock drilling process,and quantify the influence laws of impact velocity,impact frequency,rotation velocity and their coupling parameters on specific energy of rock breaking.Finally,the optimal working condition combination was determined based on the grey relational analysis method,which improved the drilling energy efficiency and formed an intelligent rock drilling process database suitable for hard rock strata,providing scientific guidance for the parameter optimization of emergency rescue equipment.