泥水盾构隧道用新型环保泥浆及流变性质  

Environmentally friendly slurry and rheological properties for slurry shield tunnel

作　　者：孙腾云 丁万涛 王承震[1] 于文端[1] 王志成 郭文静[2] SUN Tengyun;DING Wantao;WANG Chengzhen;YU Wenduan;WANG Zhicheng;GUO Wenjing(China Railway 14th Bureau Group Co.,Ltd.,Jinan 250014,Shandong,China;School of Qilu Transportation,Shandong University,Jinan 250002,Shandong,China;Institute of Geotechnical and Underground Engineering,Shandong University,Jinan 250061,Shandong,China)

机构地区：[1]中铁十四局集团有限公司,山东济南250014 [2]山东大学齐鲁交通学院,山东济南250002 [3]山东大学岩土与地下工程研究院,山东济南250061

出　　处：《山东大学学报(工学版)》2024年第6期82-88,99,共8页Journal of Shandong University(Engineering Science)

基　　金：国家自然科学基金面上资助项目(52278403);山东省自然科学基金资助项目(ZR2021ME135)。

摘　　要：针对泥水盾构传统添加剂羧甲基纤维素钠(sodium carboxymethyl cellulose, CMC)降解困难这一问题,提出一种以亚麻籽胶(天然绿色植物胶)作为添加剂的环保泥浆。采用流变仪分析亚麻籽胶对膨润土泥浆流变曲线的影响,研究不同亚麻籽胶质量分数下屈服应力和表观黏度的变化规律,并与CMC和现有环保添加剂瓜尔胶的效果进行对比,揭示各添加剂在泥浆中的作用机理。结果表明,上述3种添加剂均可以提高泥浆的流变性质,各泥浆的流体动力学行为可用Herschel-Bulkley模型较好地描述,且表观黏度μ、屈服应力τ0、稠度系数k与添加剂质量分数C呈正相关,而流变指数n与质量分数C呈负相关。当添加剂质量分数一定时,亚麻籽胶对膨润土泥浆流变性质的提高效果与CMC相近并高于瓜尔胶,可代替二者作为环保泥浆的添加剂。In order to solve the difficult degradation problem of traditional additive sodium carboxymethyl cellulose(CMC)for slurry shields,an environmental friendly slurry with flaxseed gum(natural green vegetable gum)as an additive was proposed.The effect of flaxseed gum on the rheological curve of bentonite slurry was analyzed by rheometer.The variation of yield stress and apparent viscosity under different flaxseed gum content was studied.The effect of CMC and existing green additive guar gum was compared.The mechanism of different additives in slurry was also clarified.The results showed that the three additives could improve the rheological properties of the slurry.The hydrodynamic behavior was well described by Herschel-Bulkley model.The apparent viscosityμ,yield stressτ0 and consistency coefficient k were positively correlated with the additive content C,while the rheological index n was negatively correlated with the content C.When the additive content was constant,the effect of flaxseed gum on the rheological properties of bentonite slurry was similar to CMC and higher than guar gum,which could replace the two as additives for environmental friendly slurry.

关 键 词：泥水盾构 泥浆 亚麻籽胶 流变性质 作用机理 

分 类 号：U45[建筑科学—桥梁与隧道工程]