长江科学院院报 ›› 2022, Vol. 39 ›› Issue (10): 116-120.DOI: 10.11988/ckyyb.20210665

• 岩土工程 • 上一篇    下一篇

预成孔置换强夯法在软土地基中的试验研究

赵永祥1, 刘波2, 高玉杰3, 王智4   

  1. 1.中交一公局集团有限公司,北京 100024;
    2.中化岩土集团股份有限公司,北京 102600;
    3.中交水运规划设计院有限公司,北京 100007;
    4.中交第一航务工程勘察设计院有限公司,天津 300222
  • 收稿日期:2021-07-02 修回日期:2021-09-04 发布日期:2022-10-13
  • 作者简介:赵永祥(1983-),男,河北石家庄人,高级工程师,硕士,从事岩土工程科研、设计及咨询工作。E-mail:zhaoyongxiang126@126.com

Experimental Investigation on Treatment of Soft Soil Foundation by Prebored Dynamic Replacement

ZHAO Yong-xiang1, LIU Bo2, GAO Yu-jie3, WANG Zhi4   

  1. 1. CCCC First Highway Engineering Group Co. ,Ltd. ,Beijing 100024,China;
    2. China Zhonghua Geotechnical Engineering Group Co. ,Ltd. ,Beijing 102600,China;
    3. CCCC Water Tranaportation Consultants Co. ,Ltd. ,Beijing 100007,China;
    4. CCCC First Harbor Consultants Co. ,Ltd. , Tianjin 300222,China
  • Received:2021-07-02 Revised:2021-09-04 Published:2022-10-13

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摘要： 强夯置换法是一种软土地基处理方法,存在置换墩不着底、工后沉降大、施工效率低等缺点。针对强夯置换法的上述缺点,提出了一种新型软土地基处理方法——预成孔置换强夯法。该方法通过将高能级强夯法与预先成孔填料相结合,达到提高地基承载力、减小工后沉降的目的。通过开展试验区(24 m×24 m)试验,在夯后进行平板载荷试验、重型动力触探试验及充水预压试验,验证了该方法的可行性,并最终将该技术成功应用于整个软土地基场地。试验结果表明:夯后动力触探击数提高了260%以上,复合地基承载力达到280 kPa,储罐基础沉降最大值、相邻测点沉降差均远小于规范要求。该方法的成功应用对于今后类似地基的处理具有一定的参考意义。

关键词: 软土地基, 强夯置换法, 高能级强夯, 预成孔, 充水预压, 工后沉降

Abstract: Dynamic replacement,as a treatment method for soft soil foundation,has some shortcomings such as the gap between the replacement columns and the basement,large post-construction settlement,and low construction efficiency. In view of this,a dynamic replacement method with prebored filling is proposed to enhance the bearing capacity of foundation and reduce the post-construction settlement by tamping the prebored columns filled with materials under high energy level. The method is verified feasible through plate loading test,heavy dynamic penetration test and water filling and preloading test after tamping,and finally successfully applied to the whole soft soil foundation site. The number of dynamic sounding blows after tamping increased by over 260%,the bearing capacity of composite foundation reached 280 kPa,and the maximum settlement of tank foundation and the settlement difference of adjacent measuring points are far less than the requirements of specification. The successful application of this method serves as reference for the treatment of similar foundation.

Key words: soft soil foundation, dynamic replacement method, dynamic compaction with high energy level, prebored, water filling and preloading test, post construction settlement

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