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隧道建设(中英文) ›› 2013, Vol. 33 ›› Issue (6): 510-514.DOI: 10.3793/j.issn.1672-741X.2013.06.013

• 施工技术 • 上一篇    下一篇

湘江隧道江心洲竖井上软下硬地层旋挖成孔关键技术

赵全民   

  1. (中铁隧道股份有限公司, 河南郑州 450000)
  • 收稿日期:2013-04-09 修回日期:2013-05-07 出版日期:2013-06-20 发布日期:2013-07-25
  • 作者简介:赵全民(1968—),男,陕西合阳人,2010年毕业于兰州大学工商管理专业,硕士,高级工程师,主要从事隧道及地下工程施工管理工作。

Key Technologies for Borehole Drilling by Rotary Drilling Machines in Heterogeneous Ground: Case Study on Bored Piles of Vertical Shaft of Xiangjiang River Crossing Tunnel

ZHAO Quanmin   

  1. (China Railway Tunnel Stock Co., Ltd., Zhengzhou 450000, Henan, China)
  • Received:2013-04-09 Revised:2013-05-07 Online:2013-06-20 Published:2013-07-25

摘要:

旋挖灌注桩成孔施工在长沙营盘路湘江隧道江中竖井施工中分别遇到严重塌孔、漏浆和无法钻进、效率低的问题,通过研究砂卵石地层和中风化岩层工程地质特性和分析旋挖工艺特点,采用严格控制泥浆指标、采用聚合物泥浆、采用耐磨合金子弹头截齿旋挖钻头和换填优质土等措施,克服了旋挖钻机在长沙地区砂卵石、中风化板岩地层中塌孔漏浆、无法钻进的问题,确保了围护桩按计划实施和桩体施工质量满足要求。

关键词: 湘江隧道, 竖井, 上软下硬地层, 旋挖钻机, 围护桩, 砂卵石地层, 中风化板岩, 泥浆护壁

Abstract:

The bored piles of the vertical shaft of Xiangjiang river crossing tunnel on Yingpan road in Changsha are located in heterogeneous ground, i.e., sandy cobble strata in the upper part and mediumweathered slate in the lower part. During the construction of the bored piles, serious borehole collapse, slurry leakage and other problems occur. Technologies, including strictly controlling the slurry indexes, using polymeric slurry, using wearresistant drill bit with alloy bulletshaped teeth and backfilling high quality soil, are adopted. In the end, the construction of the bored piles has been completed successfully and the pile quality is guaranteed.

Key words: Xiangjiang river crossing tunnel, vertical shaft, heterogeneous ground, rotary drilling machine, retaining pile, sandy cobble strata, mediumweathered slate, borehole wall protection by slurry