›› 2014, Vol. 28 ›› Issue (6): 60-63.

• 工程实录 • 上一篇    下一篇

深厚块石堆填层覆盖的岩溶地区冲孔桩施工

肖玉成,谷丙申   

  1. (中冶集团武汉勘察研究院有限公司,武汉 430080)
  • 收稿日期:2014-09-28 出版日期:2014-12-25 发布日期:2015-01-12
  • 作者简介:肖玉成(1970-),男,高级工程师,研究方向为基坑工程技术与建构筑物纠倾加固技术。

Cast-In-Place Concrete Pile Installation in Talus Covered Karst Area

XIAO Yucheng, GU Bingshen   

  1. (Wuhan Surveying & Geotechnical Research Institute Co. Ltd., of MCC, Wuhan, 430080)
  • Received:2014-09-28 Online:2014-12-25 Published:2015-01-12

摘要: 块石堆填地层由漂石、碎块石混少许粘性土组成,粒径大小不一,结构松散,孔隙大;岩溶地区基岩多发育溶洞、溶沟、溶槽、裂隙等形态,岩面坡度大。在厚层块石堆填物覆盖的岩溶地区,桩基选型相对容易,但桩基成孔施工往往成为制约工程工期的关键因素及工程的难点。应用泥浆护壁冲击成孔工艺配合合适的工艺控制手段,可以很好解决类似地层的桩基施工难点问题。实践证明,手动冲击钻机对类似地层更为高效。

关键词: 块石堆填地层, 岩溶, 桩基选型, 冲击成孔, 工艺措施

Abstract: The talus is consists of boulders with various sizes, rock fragments and small amount of soils. It has a loose structure with large voids. The karst area has well developed rock caverns, pinnacles and rock fissures. The deep foundation type selection in the talus covered karst area is relative easy but the pile installation is critical to the construction schedule and the cost of the project. The rock percussion advancement with mud slurry for the borehole protection and other techniques is a proven success to this subsurface condition. The construction practice indicates that the manually controlled percussion drilling is a better choice for castinplace piles in talus covered karst areas.

Key words: Talus Formation, Karst Areas, Pile Type Selection, Percussion Drilling, Installation Techniques