期刊：
Nuclear Engineering and Technology,2023年55(2):566-574 ISSN：1738-5733
通讯作者：
Sheng Zeng
作者机构：
[Wang, Fulin; Zeng, Sheng; Song, Jiayin; Li, Hao; Shen, Yuan; Ye, Wenhao] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Peoples R China.;[Sun, Bing] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Sheng Zeng] S;School of Resources Environment and Safety Engineering, University of South China, Hengyang, 421001, China
关键词：
In situ leaching;Uranium-bearing sandstone;Seepage characteristics;Leaching solution viscosity;Seepage pressure
摘要：
Investigating the seepage characteristics of the leaching solution in the ore-bearing layer during the in situ leaching process can be useful for designing the process parameters for the uranium mining well. We prepared leaching solutions of four different viscosities and conducted experiments using a self -developed multifunctional uranium ore seepage test device. The effects of different viscosities of leaching solutions on the seepage characteristics of uranium-bearing sandstones were examined using seepage mechanics, physicochemical seepage theory, and dissolution erosion mechanism. Results indi-cated that while the seepage characteristics of various viscosities of leaching solutions were the same in rock samples with similar internal pore architectures, there were regular differences between the saturated and the unsaturated stages. In addition, the time required for the specimen to reach saturation varied with the viscosity of the leaching solution. The higher the viscosity of the solution, the slower the seepage flow from the unsaturated stage to the saturated stage. Furthermore, during the saturation stage, the seepage pressure of a leaching solution with a high viscosity was greater than that of a leaching solution with a low viscosity. However, the permeability coefficient of the high viscosity leaching so-lution was less than that of a low viscosity leaching solution.(c) 2022 Korean Nuclear Society, Published by Elsevier Korea LLC. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
作者机构：
[Liu, Xiqi; Wang, Gang] Wuhan Univ, Sch Civil Engn, Key Lab Geotech & Struct Engn Safety Hubei Prov, Wuhan 430070, Peoples R China.;[Liu, Xiqi; Wang, Gang; Song, Leibo] Shaoxing Univ, Collaborat Innovat Ctr Prevent & Control Mt Geol H, Shaoxing 312099, Peoples R China.;[Hu, Rong] Univ South China, Sch Civil Engn, Hengyang 421001, Peoples R China.;[Ma, Xiaoming] Huahui Engn Design Grp Co Ltd, Shaoxing 312000, Peoples R China.;[Zhong, Shiji; Ou, Xiaoping] China Gezhouba Grp No 1 Engn Co Ltd, Yichang 443000, Peoples R China.
通讯机构：
[Gang Wang] K;Key Laboratory of Geotechnical and Structural Engineering Safety of Hubei Province, School of Civil Engineering, Wuhan University, Wuhan, China<&wdkj&>Collaborative Innovation Center for Prevention and Control of Mountain Geological Hazards of Zhejiang Province, Shaoxing University, Shaoxing, China
关键词：
Rock mechanics;Fracture dip angle;Triaxial compression;Mechanical properties;Acoustic emission characteristics
摘要：
To study the influence of fracture dip angle on the mechanical properties and fracture evolution mechanism of granite under triaxial stress state, MTS 815 mechanics test system was used to conduct triaxial tests on granite with different fracture dip angles, and PCI-II acoustic emission (AE) system was used to monitor the whole process information. The results show that the brittle characteristics of fractured samples with 30 degrees, 45 degrees and 60 degrees dip angles are obviously weakened, while the plastic characteristics are enhanced. The fractures destroy the structural integrity of rock, resulting in the reduction of rock resistance to load and deformation. With the increase in fracture dip angles from 0 degrees to 90 degrees, the compressive strength and elastic modulus of rock samples show a nearly "U"-shaped changing trend of decreasing first and then increasing, and the deterioration ratio coefficients are 7.8 similar to 43.3% and 7.5 similar to 66.9%, respectively. Due to the difference of fracture dip angles, the failure of granite sample shows two modes: "through-cutting fracture surface failure" and "shear failure along fracture surface." It mainly depends on the angle between fracture surface and maximum principal stress. The fracture dip angle affects the variation law of AE signals during the fracture process. Especially for the fractured rock samples with 30 degrees, 45 degrees and 60 degrees dip angles, the AE ring count and energy show obvious "migration" phenomenon, and the signal concentration distribution area is widened and moved backward. With the increase in dip angle, the active degree of rock fracture decreases at first and then increases.
期刊：
Chemical Engineering Journal,2023年453:139924 ISSN：1385-8947
通讯作者：
Yang, Jianping(jianpingyang@dhu.edu.cn)
作者机构：
[Hua, Yilong; Li, Mi; Zou, Jinglan; Yang, Jianping; Zhang, Xiaowen; Wu, Xiaoyan; Li, Donghan] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Hua, Yilong; Yang, Jianping] Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China.;[Hua, Yilong; Li, Mi; Zou, Jinglan; Wang, Wei; Zhang, Xiaowen; Wu, Xiaoyan; Li, Donghan] Univ South China, United Lab Heavy Met Pollut Control & Resource Reu, Hengyang 421001, Hunan, Peoples R China.;[Zhao, Guodong; Liu, Qing] Univ South China, Hunan Key Lab Pollut Control & Resource Reuse, Hengyang 421001, Hunan, Peoples R China.;[Zhang, Wei-xian] Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control, Shanghai 200092, Peoples R China.
通讯机构：
[Jianping Yang] S;School of Resource Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China<&wdkj&>State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
关键词：
Continuous flow stirred tank reactor;Eh control strategy;Nanoscale zero-valent iron;Uranium stability;Uranium wastewater
期刊：
Journal of Wind Engineering and Industrial Aerodynamics,2023年232:105244 ISSN：0167-6105
通讯作者：
William(Wei) Zhang
作者机构：
[Sun, Shiyan; Wang, Hanqing] Univ South China, Sch Civil Engn, Hengyang, Peoples R China.;[Sun, Shiyan; Wang, Hanqing] Univ South China, Hunan Prov Key Engn Lab Bldg Control Technol, Hengyang, Peoples R China.;[Sun, Shiyan; Zhang, William(Wei)] Univ South China, YangTze Delta Zhuji Res Inst, Zhuji, Zhejiang, Peoples R China.;[Zhang, William(Wei)] China Ind Dev Res Inst CIDRI, Ctr Sustainable Dev CSD, Shanghai, Peoples R China.;[Zhang, William(Wei)] HangZhou Long Beach Technol Ltd Co, Hangzhou, Zhejiang, Peoples R China.
通讯机构：
[William(Wei) Zhang] Y;YangTze Delta (Zhuji) Research Institute of University of South China, Zhuji, Zhejiang, PR China<&wdkj&>Center for Sustainable Development(CSD), China Industrial Development Research Institute (CIDRI), Shanghai, PR China<&wdkj&>HangZhou Long Beach Technology Ltd. Co, Binjiang, Hangzhou, Zhejiang, PR China
摘要：
In recent years, Large Eddy Simulation (LES) has been often used for predicting the pollutant diffusion around buildings. However, due to the numerical discretization error and the sub-grid scale modeling error, some empirical factors related to LES have not yet formed with completion for the best practice. This study focused on LES simulation of the airflow and pollutant diffusion around building with a synthetic inflow turbulence method and Wall-Adapting Local Eddy-Viscosity (WALE) model, discuss LES empirical factors, such as effects of grid resolution, sub-grid scale (SGS) WALE model with coefficient Cw and the sub-grid scale Schmidt number ScSGS in details. The results indicate that the numerical wind tunnel created by LES can better reproduce the charac-teristics of the airflow and concentration field around buildings while keeping predicted physical fields are in line with the evaluation index. In addition, the results also indicate that the solution with the finest grid resolution may not have the best agreement with the experimental data, the flow field is more sensitive to the change of SGS model coefficient Cw when the grid resolution is lower, which shows a trend that the larger coefficient Cw has better simulation in the windward sides of the building, while the value of the coefficient Cw shows an opposite trend in the recycling area at the rear of the building.
