Effects of ratio of dynamic load to static one on rock-breaking efficiency

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (1) : 22-28.

ZHU Xiaohua1, GUO Guangliang1,2

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Abstract

Rotary percussion drilling technique can significantly improve the drilling efficiency.However, the best performance of this technique can’t be brought into play when it is popularized and applied due to our not enough understanding effects of ratio of dynamic load to static one on rock-breaking efficiency.Here, adopting Drucker-Prager criterion as the rock yield criterion, a non-linear dynamic finite element (FE) model of bit tooth-rock interaction was established based on the elastoplastic mechanics and the rock mechanics.The numerical simulation results were compared with test ones to verify the reliability of the numerical computation model.The effects of ratio of dynamic load to static one on rock internal stress distribution law and bit tooth’s penetrating rock features were studied.The results showed that the dynamic-static combined load is more beneficial for bit tooth’s breaking rock; when the total value of dynamic-static combined load is constant, there is a load ratio with the optimal bit tooth’s rock-breaking efficiency, it is positively correlated to rock compressive strength; the optimal load ratio for bit tooth’s breaking limestone is 0.42—0.48 when the confining pressure is 10—90 MPa; considering the existing technical conditions and engineering situations, the load ratio for rotary percussion drilling in limestone strata should be taken as 0.1—0.48; if the compressive strength of the other target strata is larger or smaller than that of limestone, the load ratio may increase or decrease appropriately.

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load ratio / rock-breaking efficiency / bit tooth / rotary percussion drilling / FEM

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ZHU Xiaohua1, GUO Guangliang1,2. Effects of ratio of dynamic load to static one on rock-breaking efficiency[J]. Journal of Vibration and Shock, 2019, 38(1): 22-28

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