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
甘心, 殷琨, 殷其雷, 李鹏
Gan Xin, Yin Kun, Yin Qilei, Li Peng
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θd和扩压槽水平倾角θk做了进一步的分析和研究,得到θd和θk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。
中图分类号:
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