超深地连墙护壁泥浆的聚合物改性试验研究
PDF下载 (422)王 艳,丁永浩,黄添之.超深地连墙护壁泥浆的聚合物改性试验研究[J].宁波大学学报(理工版),2025,38(4):1-10.DOI:10.20098/j.cnki.1001-5132.2025.0106
WANG Yan,DING Yonghao,HUANG Tianzhi.Experimental study on ultra-deep diaphragm wall bentonite slurry modified by polymers[J].Journal of Ningbo University(Natural Science & Engineering Edition),2025,38(4):1-10.DOI:10.20098/j.cnki.1001-5132.2025.0106
| Title: | Experimental study on ultra-deep diaphragm wall bentonite slurry modified by polymers |
| 作者: | 王 艳, 丁永浩, 黄添之 |
| Author(s): | WANG Yan, DING Yonghao, HUANG Tianzhi |
| 关键词: | 地下连续墙; 聚合物改性; 护壁泥浆; 泥浆渗透; 携渣循环 |
| Keywords: | diaphragm wall; polymer modification; wall protection slurry; slurry permeability; silt carrying circulation |
| 分类号: | TU442；TU93 |
| DOI: | 10.20098/j.cnki.1001-5132.2025.0106 |
| 文献标识码: | A |
| 摘要: | 为解决地下连续墙随开挖深度增加过程中引起的槽壁失稳和槽底沉渣清理困难等问题，采用羧甲基纤维素钠、黄原胶、硅丙乳液、海藻酸钠和部分水解聚丙烯酰胺5种聚合物对膨润土泥浆进行改性研究，并通过砂质地层渗透试验和携渣循环试验评估其工程特性。结果表明，合理配比的聚合物改性能有效控制泥浆的黏度，降低滤失量，并在护壁渗透过程中快速形成薄而致密的泥皮。在砂质地层中，聚合物改性膨润土泥浆的滤失量相较于未改性泥浆有着显著的降低，滤失量下降20.5%~35.5%，改性后的泥浆滤失液Zeta电位值上升12.1%~27.6%，泥浆体系稳定性随聚合物改性有了明显改善。同时，改性后泥浆在携带槽底沉渣后的二次循环使用中仍能保持表观工程性质的稳定；聚合物可增大膨润土颗粒表面积，形成共聚物或水凝胶，提高膨润土的吸水性和膨胀性，进而提高改性膨润土泥浆的护壁性能。 |
| Abstract: | In order to solve the problems such as the instability of the trench wall and the difficulty in cleaning the sediment at the bottom of the trench caused by the increase of the excavation depth of the underground continuous wall, five polymers were used to modify the bentonite slurry, including sodium carboxymethyl cellulose, xanthan gum, silicone-acrylic emulsion, sodium alginate and partially hydrolyzed polyacrylamide. The engineering characteristics of the modified bentonite slurry were evaluated by permeability test and slag carrying cycle test in sandy strata. The results show that a reasonable ratio of polymer modification can effectively control the viscosity of the mud, reduce the filter loss, and quickly form a thin and dense mud skin in the process of wall protection penetration. In sandy strata, the filtration loss of polymer modified bentonite slurry is significantly lower than that of unmodified slurry, and the filtration loss can be reduced by 20.5%-35.5%. The Zeta potential value of the modified mud filtrate can increase by 12.1%-27.6%, and the stability of the mud system has been significantly improved with the modification of the polymer. At the same time, the modified slurry can still maintain the stability of the apparent engineering properties in the secondary recycling after carrying the bottom sediment. Polymers can increase the surface area of bentonite particles, form copolymers or hydrogels, improve the water absorption and expansion of bentonite, and thus improve the wall protection performance of the modified bentonite slurry. |
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| 备注/Memo: | 收稿日期：2025−01−06 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ 基金项目：浙江省自然科学基金重点项目（Z25E080010） 第一作者：王 艳，博士/教授，主要研究方向为基础工程、环境岩土工程。E-mail: wangyan@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
