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https://doi.org/https://doi.org/10.64486/m.66.1.9

Numerical Analysis of the Sensitivity of Maximum Impact Force to Parameter Variations in the Drucker–Prager Failure Model for Pneumatic Rock Drilling

Jianbing Pei ; Quzhou College of Technology, Quzhou 324000, China
Dongfang Li ; Quzhou College of Technology, Quzhou 324000, China *
Ming'an Zhou ; Quzhou College of Technology, Quzhou 324000, China
Huiyi Zhu ; Quzhou College of Technology, Quzhou 324000, China
Fangzan Luo ; Quzhou College of Technology, Quzhou 324000, China
Zengyang Huang ; Quzhou Intellectual Property Protection Center, Quzhou 324000, China
Wentao Fu ; Quzhou Academy of Metrology and Quality Inspection, Quzhou 324000, China
Haibin Lin ; Quzhou Academy of Metrology and Quality Inspection, Quzhou 324000, China
Sufen Wang ; College of Mechanical Engineering, Quzhou University, Quzhou 324000, China
Lichun Zhou ; Yangtze Delta Region Institute (Quzhou), University of Electronic Science and Technology of China, Quzhou 324000, China

* Dopisni autor.

Sažetak

This study investigates the rock-breaking process of pneumatic rock drills using the Drucker–Prager (D–P) strength criterion. A numerical drilling model comprising a rigid impact piston, a rigid drill bit, and D–P rock material was developed in ANSYS LS-DYNA. A sensitivity analysis was performed to evaluate the influence of key material parameters on the maximum impact force between the drill bit and rock. Mesh independence was confirmed with an optimal rock element size of 1.000 mm. The effects of maximum principal strain at failure, rock density, elastic shear modulus, Poisson’s ratio, friction angle, dilation angle, and cohesion were examined over a variation range of ±10 % to ±50 %. Results show that the elastic shear modulus has the strongest influence on the maximum impact force, exhibiting an approximately linear positive relationship. The maximum principal strain at failure also significantly affects impact force, whereas density and Poisson’s ratio produce non-monotonic responses. Friction and dilation angles show strong sensitivity within a limited angular range, while cohesion has only a minor effect. Furthermore, the elastic shear modulus remains the dominant parameter even under different failure-strain conditions, indicating an interaction between stiffness and failure characteristics. The findings provide guidance for predicting drilling forces, optimizing drill-bit design, and improving drilling efficiency through better matching of rock properties and drilling parameters.

Ključne riječi

pneumatic rock drilling; Drucker–Prager criterion; finite element modelling; sensitivity analysis; impact force; rock fragmentation

Hrčak ID:

350081

URI

https://hrcak.srce.hr/350081

Datum izdavanja:

1.1.2027.

Posjeta: 0 *