Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (1): 187-194.doi: 10.13278/j.cnki.jjuese.201601202

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Analysis on the Bottomhole Flow Field and Structural Optimization of Air Reverse Circulation Drill Bit

Gan Xin, Yin Kun, Yin Qilei, Li Peng   

  1. College of Construction Engineering, Jilin University, Changchun 130026, China
  • Received:2015-04-22 Online:2016-01-26 Published:2016-01-26
  • Supported by:

    Supported by Geological Survey Projects of China Geological Survey(12120113096900)

Abstract:

In order to improve the application effect of the reverse circulation air hammer drilling technique,on the construction of rock-socketed pile by using software Fluent, the authors analyzed the horizontal inclination angle θd of flushing nozzles and horizontal inclination angle θk of pressure-restoring grooves on the reverse circulation drill bit used in the construction of rock-socketed pile. The effects of the θd of flushing nozzles and the θk of pressure-restoring grooves on the suction coefficient ω of reverse circulation drill bit are obtained. Meanwhile, aiming at the deficiency in the structure design of central hollow-through hole on the reverse circulation drill bit, we optimized the structure of reverse circulation drill bit; and thereby, the suction capacity is obviously enhanced. A 660 mm reverse circulation drill bit adopted to the optimized structure is processed, and the field tests are carried out. It can be concluded from the test results that the effect of reverse circulation formation is good, the average penetration rate is 6.00 m/h, the surface of weakly weathered rocks is successfully drilled out. This meets the requirements on drilling out the surface of weakly weathered rocks and stability of borehole wall without borehole collapse.

Key words: foundation engineering, rock-socketed pile, large diameter, reverse circulation drill bit, Fluent software

CLC Number: 

  • P634.5

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[1] Yin Qilei, Yin Kun, Liu He, Gan Xin. Application Test of DTH Hammer Reverse Circulation Drilling Technique in a Hydropower Station [J]. Journal of Jilin University(Earth Science Edition), 2014, 44(3): 961-968.
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