By analyzing the rock cracking theory, it was discovered that the rock cracking efficiency influenced by the dynamic and static load, the preloading static pressure and the loading mode. Based on mechanism of rock cracking, the technology improvement on SR220R rotary drilling rig, which includes the period static and dynamic coupling loading, freedom surface constructed by the construction method and non-controlling of the velocity of the drilling head was carried out. It results in the union function of attack-static pressure-plug shear on the rock, which improves the efficiency of rock cracking of the rotary drilling rig. The field experimental results show that the skip cracking of rock can be realized by SR220R rotary drilling rig and the rock cracking efficiency is guaranteed. At the same time, it validates the correctness of the mechanism of rock cracking and the success of the engineering application.
Key words
mechanical engineering /
rotary drilling rig /
experimental research /
mechanism of rock cracking /
coupling loading
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