土工基础

›› 2014, Vol. 28 ›› Issue (5): 91-95.

• 工程实录 • 上一篇    下一篇

大面积回填深厚粘土强夯试夯分析

龚丽飞1，2，蒋云杰3，陈东东2，周 丹2   

  1. （1.南京水利科学研究院，南京 210029；2.南京瑞迪建设科技有限公司，南京 210029；
    3.徐州市水利建筑设计研究院，江苏 徐州 221000）
  • 收稿日期:2013-09-24 出版日期:2014-10-20 发布日期:2014-10-28
  • 作者简介:龚丽飞（1981-），男，硕士，工程师，研究方向为软土地基处理的生产与研究。

Application of Dynamic Compaction Method for Large Areas of Deep Clay Backfills

GONG Lifei1,2,  JIANG Yunjie3, CHEN Dongdong2， ZHOU Dan2   

  1. （1.Nanjing Hydraulic Research Institute, Nanjing, 210029；
    2.Nanjing R&D Tech Group CO., Ltd, Nanjing, 210029；
    3.Xuzhou Hydraulic and Build Design and Research Institute, Xuzhou, 221000）
  • Received:2013-09-24 Online:2014-10-20 Published:2014-10-28

摘要： 某工程场地由一定膨胀性的粉质粘土和粘土回填形成，最大深度达8 m以上，设计采用强夯法处理。为掌握深厚粘土强夯施工参数是否合理可行，依据不同的回填深度，选用不同强夯试夯参数，对试夯后回填土性状进行了测试和分析。从试夯结果分析可知，处理6~8 m回填深度区域，夯击能3000 kN·m、间距6 m的夯击参数在处理效果上优于夯击能2000 kN·m、间距5 m，深厚回填粘土的强夯处理，参数选取上优先考虑处理深度，通过调整夯点间距、夯击点数达到施工各项参数的最优组合和处理效果。实践证明，开展试夯工作在强夯设计与施工过程中尤为重要。

关键词: 强夯, 试夯, 深厚回填土

Abstract: This project site was backfilled with silty clayey and clayey soils with weak expansive potentials. The maximum backfill depth is 8 meters. The dynamic compaction method was utilized to improve the site.  Different dynamic compaction trial parameters and monitoring programs are used in different areas with different backfill depths. The results indicate that, the compaction energy of 3,000 kN·m and a spacing of 6 meters has a better results than those area compacted by the compaction energy of 2,000 kN·m and a spacing of 5 meters.  The depth of backfills should be considered first when the compaction parameters are to be selected. The results can be optimized by adjusting the compaction spacing, number of drops at each compaction point in the trial compactions.

Key words: Dynamic Compaction, Trial Compaction, Deep Backfills