Article
Engineering, Geological
Lenka Rukavickova, Jan Holecek, Pavla Holeckova, Jan Najser, Libor Gvozdik, Tomas Paces
Summary: Field measurements of hydraulic properties in Czech granitoids show different hydraulic conductivity in fractured rock and rock matrix, with mean values ranging from 10-8 to 10-7 m/s and 10-11 to 10-12 m/s respectively. Differences between laboratory and field values are mainly caused by scale effect, which is influenced by the connectivity of microfissure network.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Engineering, Geological
Ermeng Zhang, Yanchun Xu, Yu Fei, Xingyu Shen, Lin Zhao, Lei Huang
Summary: Through experiments and numerical simulations, the impact of dominant fractures and slurry viscosity on slurry diffusion in a fracture network was investigated. Different characteristics of fractured rock masses were observed under various conditions, with varying diffusion patterns of the slurry. Higher slurry viscosity resulted in a smaller diffusion area, with greater stress on the fractured rock matrix.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Engineering, Geological
Yi-Feng Chen, Yuke Ye, Ran Hu, Zhibing Yang, Chuang-Bing Zhou
Summary: Modeling unsaturated flow in fractured rocks is crucial for subsurface engineering applications, but determining the hydraulic properties of rocks with fractures of varying scales is challenging. This study proposes scaling relationships between van Genuchten parameters and hydraulic conductivity derived from soil sample data. These relationships are then used to predict the upper bounds of van Genuchten parameters for fractured rocks based on more easily obtainable field data, and the predictions are validated using data from cores, fractures, and fractured rocks. This methodology allows for more accurate determination of representative values for modeling saturated-unsaturated flow in fractured rocks and has been successfully applied to the modeling of flow behaviors in fractured rocks in a complex hydrogeological condition.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2022)
Article
Engineering, Chemical
Xiaofang Lv, Boyu Bai, Yi Zhao, Yang Liu, Qianli Ma, Chuanshuo Wang, Shidong Zhou, Shangfei Song, Bohui Shi
Summary: This paper focuses on the effects of water cut, polymerization inhibitor concentration, and temperature on the viscosity of natural gas hydrate slurry. It establishes a rheological model for the slurry and finds that water cut and polymerization inhibitor concentration increase the apparent viscosity, while temperature decreases it.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Engineering, Geological
Yihao Liang, Ziteng Jiang, Qingchun Yu
Summary: The existence of a hydraulic conductivity representative elementary volume (KREV) in fractured rock masses is influenced by fracture density and persistence. A high fracture density and persistence increase the likelihood of a KREV, with size depending on the fracture spacing.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Energy & Fuels
Yiwei Cheng, Chunwei Chou, Marco Voltolini, Sharon Borglin, Jonathan B. Ajo-Franklin, Yuxin Wu
Summary: This study aims to investigate the impact of subsurface biological processes, such as biofilm development, on flow and permeability evolution in fractured rocks, especially during the processes of souring and nitrate treatment. The experiment revealed that bioclogging can modify flow properties and transition the flow regime within fractured columns, affecting microbial sulfate reduction rates. The study also observed distinct stages in biofilm-permeability development, showcasing the complex interactions between biofilms and the flow characteristics of fractured rocks.
Article
Engineering, Geological
Chuang-Bing Zhou, Yi-Feng Chen, Ran Hua, Zhibing Yang
Summary: Groundwater flow through fractured rocks is significant in geotechnical engineering practices. The paper discusses various aspects including the mechanisms of fluid flow, characterization of hydraulic properties, numerical modeling, and engineering applications. The microscopic mechanisms of fluid flow in fractured rocks under complex conditions have been revealed through visualized experiments and theoretical analysis. Methods for characterizing hydraulic properties and numerical simulation approaches for groundwater flow have been proposed, and case studies demonstrate the application of theoretical understanding, modeling approaches, and control strategies in geotechnical engineering projects.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Engineering, Geological
Qinghua Lei, Nima Gholizadeh Doonechaly, Chin-Fu Tsang
Summary: A fully-coupled hydro-mechanical model was developed to study the impact of fluid injection on fractured rocks, revealing the control of natural fracture networks on damage, seismic activities, and connectivity changes. The strong poro-elastic effect during fluid injection was highlighted, driving heterogeneous connectivity evolution in fracture systems.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2021)
Article
Engineering, Civil
N. Guiheneuf, A. Dausse, J-R de Dreuzy, B. L. Parker
Summary: This study introduces a new framework for interpreting the long-term pumping test results in fractured sandstone and shale formations, along with scaling analysis driven by geological evidence. The consistent scaling of transmissivity T to storativity S provides essential information about flow-bearing structures, demonstrating the validity of different flow structures in the fractured rocks.
JOURNAL OF HYDROLOGY
(2021)
Article
Mathematics
Minglei Zhai, Dan Ma, Haibo Bai
Summary: This paper studies the diffusion mechanism of slurry in horizontal fractures of fractured aquifers, establishes a one-dimensional seepage grouting theoretical model, and proposes a grouting scheme for water disaster prevention in coal mine floor. The rationality and effectiveness of the grouting scheme were verified through experiments.
Article
Engineering, Civil
Huawen Zhao, Ning Luo, Walter A. Illman
Summary: This study explores the importance of geological information on geostatistics-based transient hydraulic tomography (THT) analysis, showing that accurate geological data is crucial for preserving fracture and matrix hydraulic parameters. The findings highlight the significance of incorporating accurate geological data in THT analyses, especially when drawdown data is sparse and not available within the matrix, to improve the reliability and accuracy of the results.
JOURNAL OF HYDROLOGY
(2021)
Article
Engineering, Geological
Wenzhao Meng, Wei Wu
Summary: This study combines experimental, numerical, and machine learning methods to predict the uniaxial compressive strength and Young's modulus of frozen fractured rocks. The reliable prediction of these mechanical properties is demonstrated, and a simplified model with three dominant fracture geometries is obtained. The combined method is applicable to studying other mechanical properties of complex fractured rocks.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Review
Construction & Building Technology
Wenhao Zhang, Nan Yao, Binyu Luo, Yicheng Ye, Felix Oppong
Summary: This study conducted a direct shear experiment to investigate the mechanical properties and strength variation of ESFC with different slurry thicknesses, initial normal stresses, and fracture roughness. The results showed that increasing slurry thickness, initial normal stress, and fracture roughness enhanced the shear strength of ESFC, but their growth trends of strength were different. Additionally, ESFC with different conditions exhibited similar failure modes, primarily ladder-like distribution along the tensile fracture of the expansive slurry and the deformation of the slurry-rock interface.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Petroleum
Ye Tian, Chi Zhang, Zhengdong Lei, Xiaolong Yin, Hossein Kazemi, Yu-Shu Wu
Summary: An improved multicomponent diffusion model for fractured reservoirs was proposed to better quantify the transport processes across the fracture/matrix interface. The model was validated with diffusion experiments and showed better match with a fine-grid model compared to the double-porosity model. The simulation of a gas huff 'n' puff well demonstrated that including diffusion can affect the performance, especially for gas recovery and oil rate.
Article
Energy & Fuels
Hongwei Wang, Hejuan Liu, Dongfang Chen, Haidong Wu, Xianpeng Jin
Summary: To efficiently exploit geothermal energy, it is important to have a reasonable configuration of fracture networks that minimize water loss, while maintaining high flow rates, high production temperatures, and good connectivity between injection and production wells. The study establishes a THM coupling model to analyze the influence of factors such as formation stress, injection pressure, fracture surface roughness, fracture intersection angle, and fracture connectivity on fluid seepage pressure and outlet temperature. Comprehensive consideration of multiple parameters is crucial for the development of EGS projects and their commercial viability.
Article
Engineering, Environmental
Wenqiang Mu, Lianchong Li, Tianhong Yang, Guofeng Yu, Yunchun Han
BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT
(2019)
Article
Engineering, Mechanical
Wenqiang Mu, Lianchong Li, Daozhi Chen, Sixu Wang, Fukun Xiao
ENGINEERING FAILURE ANALYSIS
(2020)
Article
Geochemistry & Geophysics
Bo Ren, Wenqiang Mu, Bingyou Jiang, Guofeng Yu, Lianchong Li, Tingshuang Wei, Yunchun Han, Diancai Xiao
Summary: This study established a slurry diffusion model and analyzed the diffusion mechanism in a dynamic water environment, proposing an optimization scheme to meet the grouting requirements. Experimental results showed that the optimization method of multiple grouting holes effectively improved the efficiency of slurry diffusion.
Article
Construction & Building Technology
Wenqiang Mu, Dongying Wang, Lianchong Li, Tianhong Yang, Qingbo Feng, Sixu Wang, Fukun Xiao
Summary: The study is based on the flow mechanism of cement slurry in geological fractures, enhancing the accuracy of traditional grouting design and optimizing the grouting parameters and slurry materials ratios; the case study revealed that existing fractures can weaken the flow capacity of cement in another fracture, affecting the diffusion of cement, with wider fractures having a greater impact on narrower fractures.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Civil
Wenqiang Mu, Lianchong Li, Xige Liu, Liaoyuan Zhang, Zilin Zhang, Bo Huang, Yong Chen
GEOMECHANICS AND ENGINEERING
(2020)
Article
Energy & Fuels
Wenqiang Mu, Lianchong Li, Zhongping Guo, Zhaowen Du, Sixu Wang
Article
Engineering, Geological
Zhongping Guo, Wenqiang Mou, Wanpeng Huang, Huiqiang Duan
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2016)