空气反循环钻头井底流场分析及结构优化

doi:10.13278/j.cnki.jjuese.201601202

吉林大学学报(地球科学版) ›› 2016, Vol. 46 ›› Issue (1): 187-194.doi: 10.13278/j.cnki.jjuese.201601202

空气反循环钻头井底流场分析及结构优化

甘心, 殷琨, 殷其雷, 李鹏

吉林大学建设工程学院, 长春 130026

收稿日期:2015-04-22 出版日期:2016-01-26 发布日期:2016-01-26
通讯作者: 殷琨(1952),男,教授,博士生导师,主要从事多工艺冲击回转钻探工艺及工具方面的研究,E-mail:yinkun@jlu.edu.cn E-mail:yinkun@jlu.edu.cn
作者简介:甘心(1987),男,博士研究生,主要从事多工艺冲击回转钻探工艺及工具方面的研究,E-mail:ganxin0818@sina.com
基金资助:
中国地质调查局项目(12120113096900)

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

Gan Xin, Yin Kun, Yin Qilei, Li Peng

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)

摘要/Abstract

摘要：

为改善空气潜孔锤反循环钻进技术在大口径嵌岩桩施工中的应用效果,运用Fluent软件对嵌岩桩施工用反循环钻头底喷孔水平倾角θ_d和扩压槽水平倾角θ_k做了进一步的分析和研究,得到θ_d和θ_k对反循环钻头抽吸系数ω的影响规律。在分析中发现原有反循环钻头中心贯通孔结构设计中的不足之处,并进行了优化,优化后的反循环钻头抽吸效果明显增强。采用优化后的结构加工了一个直径为660 mm的反循环钻头,并进行现场钻进试验,试验效果良好,平均钻进效率为6.00 m/h,成功嵌入微风化岩层表面,能够满足嵌岩桩施工对嵌入微风化岩层和孔壁稳定、无塌孔的要求。

关键词: 基础工程, 嵌岩桩, 大直径, 反循环钻头, Fluent软件

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 θ_d of flushing nozzles and horizontal inclination angle θ_k of pressure-restoring grooves on the reverse circulation drill bit used in the construction of rock-socketed pile. The effects of the θ_d of flushing nozzles and the θ_k 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

中图分类号:

P634.5

甘心, 殷琨, 殷其雷, 李鹏. 空气反循环钻头井底流场分析及结构优化[J]. 吉林大学学报(地球科学版), 2016, 46(1): 187-194.

Gan Xin, Yin Kun, Yin Qilei, Li Peng. Analysis on the Bottomhole Flow Field and Structural Optimization of Air Reverse Circulation Drill Bit[J]. Journal of Jilin University(Earth Science Edition), 2016, 46(1): 187-194.

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空气反循环钻头井底流场分析及结构优化

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

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