东北大学学报(自然科学版) ›› 2025, Vol. 46 ›› Issue (4): 106-114.DOI: 10.12068/j.issn.1005-3026.2025.20230273

• 资源与土木工程 • 上一篇    

黏土地层土压平衡盾构渣土改良试验研究

李猛1, 赵文1, 王鑫1, 刘晓迪2   

  1. 1.东北大学 资源与土木工程学院,辽宁 沈阳 110819
    2.中铁九局集团第四工程有限公司,辽宁 沈阳 110032
  • 收稿日期:2023-09-25 出版日期:2025-04-15 发布日期:2025-07-01
  • 作者简介:李 猛(1998—),男,辽宁葫芦岛人,东北大学硕士研究生
    赵 文(1962—),男,辽宁沈阳人,东北大学教授,博士生导师.

Experimental Study on Muck Improvement of Clay Stratum in Earth Pressure Balance Shield

Meng LI1, Wen ZHAO1, Xin WANG1, Xiao-di LIU2   

  1. 1.School of Resources & Civil Engineering,Northeastern University,Shenyang 110819,China
    2.China Railway Ninth Bureau Group Fourth Engineering Co. ,Ltd. ,Shenyang 110032,China. Corresponding author: ZHAO Wen,E-mail: zhaowen@mail. neu. edu. cn
  • Received:2023-09-25 Online:2025-04-15 Published:2025-07-01

摘要:

在黏土地层中掘进时,盾构会遇到刀盘“结泥饼”、土仓积土、排土不畅等问题.为此,依托沈阳地铁六号线文储路站—观音路站区间盾构项目,基于泡沫发泡倍率及半衰期试验、分散剂沉降试验、旋转剪切试验、流动度试验、搅拌试验进行渣土改良,并使用扫描电镜、Zeta电位及双电层理论对分散剂改良黏土的机理进行了分析. 研究表明:当泡沫剂体积分数为4%、六偏磷酸钠质量分数为2%时,改良剂性能较好;在含水率为30%的土体中,分散剂注入比为10%、泡沫注入比为30%~60%时,改良效果较好;扫描电镜及Zeta电位试验显示,质量分数为2%的六偏磷酸钠溶液能增加黏土双电层厚度,起分散黏土的作用.

关键词: 土压平衡盾构, 渣土改良, 双电层理论, 黏土地层, 评价指标

Abstract:

When tunneling in clay stratum, the shield may encounter some problems such as “mud cake” on the cutterhead, soil accumulation in the chamber, and poor soil discharge. Therefore, based on the shield project between Wenchu Road Station and Guanyin Road Station of Shenyang Metro Line 6, muck improvement was carried out based on foaming ratio and half-life test, dispersant settlement test, rotating shear test, mobility test and stirring test. Finally, scanning electron microscopy, Zeta potential and double electric layer theory were used to analyze the mechanism of clay improvement by dispersant. The results show that the performance of the modifier is better when the volume fraction of foam agent is 4% and the sodium hexametaphosphate mass fraction is 2%. The improvement effect is better when the moisture content of soil layer is 30%, the dispersant injection ratio is 10% and the foam injection ratio is 30%~60%. Scanning electron microscopy and Zeta potential tests showed that 2% sodium hexametaphosphate solution can increase the thickness of the clay double electric layer and disperse the clay.

Key words: earth pressure balance(EPB) shield, muck improvement, electric double layer theory, clay stratum, evaluation index

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