Microstructural characteristics and prediction of hydraulic properties of geotextile envelopes via image analysis and pore network modeling

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Hang Li, Jingwei Wu, Chenyao Guo, Haoyu Yang, Zhe Wu, Shuai Qin
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Abstract

In this study, the microstructural characteristics of geotextile envelopes were investigated via two-dimensional (2D) and three-dimensional (3D) image analysis. A pore network model was constructed to predict the hydraulic properties of the geotextile envelopes. Based on image analysis, the representative domain size of the geotextile envelopes was estimated and was further confirmed by pore network modeling. The results showed that while nonuniformity existed in geotextile envelopes, no noticeable difference was observed in porosity among samples of different sizes. The porosity derived from 3D image analysis was much closer to the theoretical value, with relative error less than 12%. The fibers of the geotextile envelopes were mainly distributed in the in-plane direction and were nearly uniform. The prediction of the permeability coefficient was optimal when hybrid cones and cylinders were considered as the geometric shapes and when the equivalent diameter, inscribed diameter, and total length were used as the geometric properties of the extracted pore network. The capillary pressure curves matched experimental values more closely when using the equivalent diameter for throat diameter. The representative domain size of geotextile envelopes was at least 3500 μm, but no meaningful length could be found along the through-plane direction.

通过图像分析和孔隙网络建模预测土工织物包层的微观结构特征和水力特性
本研究通过二维(2D)和三维(3D)图像分析研究了土工织物包层的微观结构特征。通过构建孔隙网络模型来预测土工织物包层的水力特性。根据图像分析,估算出了土工织物包层的代表域尺寸,并通过孔隙网络模型得到了进一步确认。结果表明,虽然土工织物包层存在不均匀性,但不同尺寸的样本之间的孔隙率没有明显差异。三维图像分析得出的孔隙率更接近理论值,相对误差小于 12%。土工织物包层的纤维主要分布在平面内,几乎均匀。将混合锥体和圆柱体作为几何形状,将等效直径、内径和总长度作为提取孔隙网络的几何属性时,渗透系数的预测结果最佳。当使用等效直径作为喉部直径时,毛细管压力曲线与实验值更为接近。土工织物包层的代表性域尺寸至少为 3500 μm,但沿通孔方向找不到有意义的长度。
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来源期刊
Geotextiles and Geomembranes
Geotextiles and Geomembranes 地学-地球科学综合
CiteScore
9.50
自引率
21.20%
发文量
111
审稿时长
59 days
期刊介绍: The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.
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