新型三维水泥土搅拌(TCM)桩成桩效果试验研究
Experimental Study on the Quality of a New Three-Dimensional Cement-Soil Mixed(TCM)Column
姚达 1翁佳兴 2邱成春 3王希晨 4刘振建3
作者信息
- 1. 江苏省工程勘测研究院有限责任公司,江苏扬州 225000;江苏鸿基水源科技股份有限公司,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;江苏鸿基水源科技股份有限公司,江苏扬州 225000
- 3. 盐城工学院土木工程学院,江苏盐城 224051
- 4. 南水北调东线江苏水源有限责任公司,南京 210029
- 折叠
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.
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 instal-lation procedures of the TCM column can overcome the slurry overflow phenomenon,which is one of the most important disad-vantages 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 in-creased significantly with the increase of the cement mixing ratio,but irrelevant to the water-cement ratio.
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Key words
TCM Columns/Installation Procedures/Standard Penetration Test/Low Stress Integrity Testing/Unconfined Compressive Strength引用本文复制引用
基金项目
江苏省水利科技项目(2020012)
江苏南水北调科技研发项目(JSNSBD202106)
出版年
2024
NETL
NSTL
万方数据