• 全国中文核心期刊
  • 中国科技核心期刊
  • 美国工程索引(EI)收录期刊
  • Scopus数据库收录期刊

活性氧化镁碳化搅拌桩模型试验研究

刘松玉, 蔡光华, 杜广印, 王亮

刘松玉, 蔡光华, 杜广印, 王亮. 活性氧化镁碳化搅拌桩模型试验研究[J]. 岩土工程学报, 2017, 39(z2): 136-139. DOI: 10.11779/CJGE2017S2034
引用本文: 刘松玉, 蔡光华, 杜广印, 王亮. 活性氧化镁碳化搅拌桩模型试验研究[J]. 岩土工程学报, 2017, 39(z2): 136-139. DOI: 10.11779/CJGE2017S2034
LIU Song-yu, CAI Guang-hua, DU Guang-yin, WANG Liang. Model tests on carbonated reactive MgO mixing piles[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(z2): 136-139. DOI: 10.11779/CJGE2017S2034
Citation: LIU Song-yu, CAI Guang-hua, DU Guang-yin, WANG Liang. Model tests on carbonated reactive MgO mixing piles[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(z2): 136-139. DOI: 10.11779/CJGE2017S2034

活性氧化镁碳化搅拌桩模型试验研究  English Version

基金项目: 国家自然科学基金项目(51279032,41330641,41372308); 国家重点研发课题(2016YFC0800201)
详细信息
    作者简介:

    刘松玉(1963- ),男,教授,主要从事软土地基加固的研究工作。E-mail: liusy@seu.edu.cn。

    通讯作者:

    蔡光华,E-mail:caiguanghua@seu.edu.cn

Model tests on carbonated reactive MgO mixing piles

  • 摘要: 软弱土须经适当的人工处理才能满足建筑和基础设施的承载需要,而MgO碳化搅拌桩法是一种创新型的地基处理技术,即将CO2气体通到拌有活性MgO的搅拌桩体中,通过一系列物理化学反应,形成稳定性好、承载力高的复合地基。基于此,采用人工挖孔制桩法,开展了不同初始含水率和不同CO2通气压力下室内搅拌桩模型试验,碳化过程中进行桩体温度监测,碳化后对桩体进行无侧限抗压强度和含水率测试。结果表明:搅拌桩温度在不足2 h碳化时间可达到最高,且峰值温度在初始含水率为20%时最高、在15%时次之、在30%时最低;峰值温度随CO2通气压力增加而增加。碳化搅拌桩强度随初始含水率增加而减小,随CO2通气压力增加而增加,且强度随含水率呈指数形式递减。碳化搅拌桩模型试验将为MgO碳化技术在软土地基加固工程中的应用提供理论指导。
    Abstract: The soft soils can meet the bearing needs of the constructions and infrastructures through the appropriate artificial treatment, and the carbonated MgO-mixing pile method is an innovative foundation treatment technology, which is that the reactive MgO-mixing pile takes a series of physical and chemical reactions with CO2 gas, forming a composite foundation with good stability and high bearing capacity. On this basis, the indoor mixing pile model tests are carried out under different initial water contents and different CO2 ventilation pressures by use of the artificial dig-hole pile method, and the temperature of mixing piles is monitored during the carbonation process, as well as these tests are performed after carbonation including unconfined compressive strength and water content. The results indicate that the pile temperature can reach the highest in less than two hours’ carbonation, and the temperature peak is the highest at the initial water content of 20%, the second at 15% and the lowest at 30%. The temperature peak increases with the increase of CO2 ventilation pressure. The strength of carbonated piles decreases with the increase of the initial water content while increases with the increase of the CO2 ventilation pressure, and the strength decreases with the water content of the carbonated soils in the form of exponential function. The carbonated mixing-pile model tests will provide theoretical guidance for the MgO-carbonation technology in the engineering application of soft soil foundation reinforcement.
  • [1] 刘松玉, 钱国超, 章定文. 粉喷桩复合地基理论与工程应用[M]. 北京: 中国建筑工业出版社, 2006. (LIU Song-yu, QIAN Guo-chao, ZHANG Ding-wen. The principle and appliciation of dry jet mixing composite foundation [M]. Beijing: China Architecture & Building Press. 2006. (in Chinese))
    [2] MIURA N, SHEN S L, KOGA K, et al. Strength change of the clay in the vicinity of soil cement column[J]. Journal of Geotechnical Engineering, Japanese Society of Civil Engineers, 1998, 556(53): 209-221.
    [3] SHEN S L, HAN J, HUANG X C, et al. Laboratory studies on property changes in surrounding clays due to installation of deep mixing columns[J]. Marine Georesources and Geotechnology, 2003, 21(1): 15-35.
    [4] 易耀林. 基于可持续发展的搅拌桩新技术与理论[D]. 南京:东南大学, 2013.(YI Yao-lin. Sustainable novel deep mixing methods and theory[D]. Nanjing: Southeast University, 2013. (in Chinese))
    [5] 易耀林, MARTIN Liska, ABIR Al-Tabbaa, 等. 一种土壤的碳化固化方法及其装置: 中国, Z.L.201010604013.1[P]. 2010. (YI Yao-lin, LISKA M, AL-TABBAA A, et al. A kind of soil carbonation curing method and device: China, Z.L. 201010604013.1[P]. 2010. (in Chinese))
    [6] 刘松玉, 李 晨. 氧化镁活性对碳化固化效果影响研究[J]. 岩土工程学报, 2015, 37(1): 148-155. (LIU Song-yu, LI Chen. Influence of MgO activity on the stabilization efficiency of carbonated mixing method[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(1): 148-155. (in Chinese))
    [7] CAI G H, LIU S Y, DU Y J, et al. Strength and deformation characteristics of carbonated reactive magnesia treated silt soil[J]. Journal of Central South University, 2015, 22(5): 1859-1868.
    [8] CAI G H, DU Y J, LIU S Y, et al Physical properties, electrical resistivity and strength characteristics of carbonated silty soil admixed with reactive magnesia[J]. Canadian Geotechnical Journal, 2015, 52(11): 1699-1713.
计量
  • 文章访问数: 
  • HTML全文浏览量:  0
  • PDF下载量: 
  • 被引次数: 0
出版历程
  • 收稿日期:  2017-08-01
  • 发布日期:  2017-12-19

目录

    /

    返回文章
    返回