西南石油大学学报(自然科学版)

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Numerical Simulation Analysis of Rock Breaking Mechanism for
Oscillation Impacter

Dong Xuecheng1,2, Xiong Jiyou1,2**, Wang Guohua1,2, Qin Dawei1,2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology & Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    2. School of Petroleum and Natural Gas Engineering,Southwest Petroleum University,Chengdu,Sichuan 610500,China
  • Online:2014-12-01 Published:2014-12-01

Abstract:

A model was built to simulate the process of rock breaking,under the action of oscillation impacter.In this model,
influences of different parameters on rock breaking efficiency were considered.Moreover,a quantitative analysis was proposed
for different parameters,such as different frequencies,different cyclic dynamic loads and different kinds of rocks.Through
the modelling and simulation using ABAQUS/Explicit,rock breaking efficiency was investigated in detail.The results indicate
that the connected face of rock and bit appears in three distinct zones:the broken zone,damage zone and undamaged zone.
Rock breaking process can be divided into three stages:center cutters of bit crushing rock,surrounding cutters of bit crush
rock and rotary cutting.When the frequency is about 16 Hz,rock breaking efficiency gets the maximum value.Along with the
increase of dynamic load,the depth of broken pit increased,when the dynamic load was larger than 10 kN,the rising trend
of rock breaking efficiency slowed down.Different rock had different rock breaking efficiency.It is very helpful to the field
application.

Key words: simulation, dynamic load, working frequency, rock breaking mechanism, rock breaking efficiency