土工基础

›› 2013, Vol. 27 ›› Issue (2): 6-8.

• 工程实录 • 上一篇    下一篇

松散堆积体及碎裂岩地层中锚索成孔技术研究

 张艳军，王超雄，张 荣   

  1. （中冶集团武汉勘察研究院有限公司，武汉 430080）
  • 收稿日期:2012-08-30 出版日期:2013-04-20 发布日期:2013-04-26
  • 作者简介:张艳军（1983-），男，湖北天门人，硕士研究生，主任工程师（国家注册岩土工程师），研究方向为岩土工程设计、研发等。

Drilling Methods of the Long Pre-stressesd Anchors in Talus and Broken Rock Masses

ZHANG Yanjun, WANG Chaoxiong, ZHANG Rong   

  1. (Wuhan Surveying-Geotechnical Research Institute, Metallurgical Company of China, Wuhan 430080)
  • Received:2012-08-30 Online:2013-04-20 Published:2013-04-26

摘要： 大量工程实践证实，松散堆积体及碎裂岩地层中锚索成孔难度大。潜孔锤跟管钻进工艺是在破碎、漏失、流砂等复杂地层中成孔的有效办法，但是该工艺还存在一些急需解决的问题。通过开展在松散堆积体及碎裂岩地层中进行钻孔试验，探索相关参数（给进风压、钻压、泵压等）在不同地层中的变化规律，对于完善锚索成孔工艺等具有较大的现实意义。

关键词: 松散堆积体, 碎裂岩, 风压, 钻压

Abstract: It is generally recognized that the difficulties in borehole advancement in the installation of prestressed ground anchors in talus formations and broken rock masses. The downhole hammer with a casing immediately followed method is an effective way to advance boreholes in complicated subsurface conditions, such as, broken rock, loose soil and running sand conditions. This paper discusses the potential difficulties of apply down hole hammer in the talus and broken rock mass formations through trial tests. The parameters such as, air entry pressure, drill bit pressure, and pump pressures, are also discussed under different subsurface conditions. 

Key words: Talus Formation, Broken Rock Mass, Air Pressures, Drill Bit Pressures