膨润土掺量对粘土基阻隔回填材料有效孔隙率和导流系数的影响

IF 1.1 4区 材料科学 Q3 Engineering Materials Science-Poland Pub Date : 2023-08-16 DOI:10.5755/j02.ms.32075
Yiyang Lv, Haoqing Xu, P. Jiang, Tao Wu
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引用次数: 0

摘要

粘土防渗墙已广泛用作垂直屏障。然而,中国很少有这种墙的工程实践。国内很少有研究表明添加国产膨润土对渗透性的影响。为了解决这一问题,采用柔性壁试验和不同膨润土的水离心脱水实验,评估了膨润土水平对土壤膨润土外加剂的导水率、孔隙率和粘土结合水的影响。结果表明,当采用膨润土和福建标准砂土混合建造挡墙时,存在最小孔隙率的临界膨润土水平。如果膨润土水平低于临界膨润土含量,导水率会迅速降低,而如果膨润土水平高于临界膨润土含量,导水力会缓慢降低。此外,随着膨润土含量的增加,外加剂的粘土结合水含量不断提高。假设粘土结合水包围粘土颗粒,提出了有效孔隙率的近似计算方法,并表明有效孔隙率随膨润土含量的增加而减小。此外,有效孔隙度和渗透率之间存在指数关系。
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Effect of Bentonite Admixture Content on Effective Porosity and Hydraulic Conductivity of Clay-based Barrier Backfill Materials
Clay-based barrier wall has been diffusely employed as vertical barriers. Nevertheless, there were few project practices of these walls in China. And few research have been performed to study the impact on the permeability of the addition of domestic bentonites. To solve this problem, the influences of bentonite level on hydraulic conductivity, porosity and clay-bound water of soil-bentonite admixtures have been assessed employing a flexible-wall test and water centrifugal dewatering experiment with various bentonites. The outcomes revealed that as barrier walls are constructed by blending bentonite and Fujian standard sandy soil, there is a critical bentonite level of the smallest porosity. If the bentonite level is less than the critical bentonite content, hydraulic conductivity is reduced quickly, while if the bentonite level is greater than the critical bentonite content, hydraulic conductivity is reduced gently. Additionally, as the bentonite level grew, the clay-bound water centage of the admixtures continually improved. Supposing that the clay-bound water enclosed the clay grains, a near computation approach of the effective porosity is put forward and showed that the effective porosity decreased with bentonite content. Additionally, an exponential relationship was found between the effective porosity and the permeability.
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来源期刊
Materials Science-Poland
Materials Science-Poland 工程技术-材料科学:综合
CiteScore
1.70
自引率
18.20%
发文量
0
审稿时长
6.2 months
期刊介绍: Material Sciences-Poland is an interdisciplinary journal devoted to experimental research into results on the relationships between structure, processing, properties, technology, and uses of materials. Original research articles and review can be only submitted.
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