Liu Jun, Su Yue, Shen Huan, Cao Yaqiang, Yang Wenjie, Huang Yong
Changzhou Architectural Research Institute Group Co., LTD, Changzhou, 213001, China.
School of Earth Sciences and Engineering, Hohai University, Nanjing, 211100, China.
Sci Rep. 2022 Aug 30;12(1):14779. doi: 10.1038/s41598-022-19117-4.
A set of one-dimensional experimental device for solute transport in non-penetrating fractured clay are developed, which can study the laws of groundwater flow and solute transport under different hydraulic heads, fractured aperture, and thickness of non-penetrating zones. The experimental results show that the solute will quickly reach the bottom of the clay along the non-penetrating fracture, and there is an obvious dominant flow phenomenon compared with the intact clay. According to the experimental data and numerical calculation results, the model parameters of the fracture and each soil layer were identified, and the verified numerical model was used to simulate the solute transport in the non-penetrating fractured clay. The numerical results show that the increase of the thickness for the non-penetrating zone has a significant improvement on the anti-seepage ability of clay, and the increase of the hydraulic head pressure and fractured aperture leads to a faster growth rate of the solute concentration, which indicates that the solute breaks down the lower impermeable clay layer under high head pressure. The research results are of great significance for the bottom anti-seepage layer similar to landfill projects.
开发了一套用于非贯通裂隙黏土中溶质运移的一维实验装置，该装置可研究不同水头、裂隙开度和非贯通带厚度条件下的地下水流和溶质运移规律。实验结果表明，溶质会沿非贯通裂隙快速到达黏土底部，与完整黏土相比存在明显的优势流现象。根据实验数据和数值计算结果，确定了裂隙和各土层的模型参数，并利用验证后的数值模型模拟了非贯通裂隙黏土中的溶质运移。数值结果表明，非贯通带厚度的增加对黏土的防渗能力有显著提升，水头压力和裂隙开度的增加导致溶质浓度增长速率加快，这表明溶质在高水头压力下会突破下部不透水黏土层。研究成果对类似填埋工程的底部防渗层具有重要意义。
