土工基础

土工基础 ›› 2024, Vol. 38 ›› Issue (2): 318-321.

• 测试技术 • 上一篇    下一篇

新型三维水泥土搅拌(TCM)桩成桩效果试验研究

姚 达1,3，翁佳兴2,3，邱成春4，王希晨2，刘振建4   

  1. (1.江苏省工程勘测研究院有限责任公司，江苏扬州 225000；2.南水北调东线江苏水源有限责任公司，南京 210029；
    3.江苏鸿基水源科技股份有限公司，江苏扬州 225000; 4.盐城工学院 土木工程学院，江苏盐城 224051)
  • 收稿日期:2022-08-18 修回日期:2022-09-07 出版日期:2024-02-29 发布日期:2024-12-22
  • 通讯作者: 刘振建（1988-），男，讲师，研究方向为软土地基处理。
  • 作者简介:姚达（1990-），男，工程师，研究方向为岩土工程技术应用及施工。
  • 基金资助:
    江苏省水利科技项目（2020012），江苏南水北调科技研发项目（JSNSBD202106）

Experimental Study on the Quality of a New Three-Dimensional Cement-Soil Mixed (TCM) Column

YAO Da1,3, WENG Jiaxing2,3, QIU Chengchun4, WANG Xichen2， LIU Zhenjian4   

  1. (1.Jiangsu Engineering Survey & Research Institute Co. Ltd., Yangzhou 225000；
    2.The Eastern Route of SouthtoNorth Water Diversion Project Jiangsu Water Source Co. Ltd., Nanjing 210029；
    3.Jiangsu Hongji Water Technology Co. Ltd., Yangzhou 225000；
    4.College of Civil Engineering, Yancheng Institute of Technology, Yancheng 224051)
  • Received:2022-08-18 Revised:2022-09-07 Online:2024-02-29 Published:2024-12-22

摘要： 针对常规水泥土搅拌桩搅拌不均匀、成桩完整性差的问题，研发了一种新型三维水泥土搅拌(TCM)桩，并提出相应施工工艺。通过现场试验，结合标准贯入测试、成桩完整性分析、芯样无侧限抗压试验，对TCM桩与常规水泥土搅拌桩的搅拌均匀性、桩身完整性、强度进行了对比分析。结果表明，TCM桩施工工艺可以解决常规水泥土搅拌桩长期存在的冒浆严重问题，且成桩效果良好，取芯率可达90%以上，桩身完整性等级接近Ⅰ类，桩身完整性和强度均优于常规水泥土搅拌桩。此外，TCM桩的标准贯入击数、无侧限抗压强度随水泥掺入比的增加而显著增大，但与水灰比相关性不显著。

关键词: TCM桩, 施工工艺, 标准贯入试验, 完整性分析, 无侧限抗压强度

Abstract: To overcome disadvantages of the conventional cement-soil mixed column installations, which often led to the poor integrity and uneven strength of the cement-mixed columns, a new three-dimensional cement-soil mixed (TCM) column system was developed, and the associated installation procedures were introduced. Combined with the standard penetration test (SPT), low stress integrity testing as well as laboratory unconfined compressive strength tests, the properties of TCM column and conventional cement-soil mixed column were comprehensively and comparatively evaluated. Results indicate that the installation procedures of the TCM column can overcome the slurry overflow phenomenon, which is one of the most important disadvantages in the conventional cement-soil mixed column installation. In addition, the quality of the TCM column is much better with coring sample rates exceed 90% for all the cases studied. Thus, the integrity grade of the TCM columns can be classified as Grade I, where the integrity and strength of the TCM column are much better than that of the conventional cement-soil mixed columns. In addition, the low counts of the standard penetration test and the unconfined compressive strength are increased significantly with the increase of the cement mixing ratio, but irrelevant to the water-cement ratio.

Key words: TCM Columns, Installation Procedures, Standard Penetration Test, Low Stress Integrity Testing, Unconfined Compressive Strength

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