Guest Editors
Dr. Richeng Liu, China University of Mining and Technology, China
Prof. Yujing Jiang, Nagasaki University, Japan
Dr. Qian Yin, China University of Mining and Technology, China
Summary
Understanding the fluid flow mechanisms in fractured porous media plays an important role in many engineering activities, such as nuclear waste disposal, geothermal energy extraction, oil and natural gas production, as well as performance and safety of underground projects including coal mines and tunnels. In recent years, many methods including numerical simulation, laboratory experiment, and theoretical analysis have been employed to investigate the flow process and permeability response of rock fractures, from kilometer scale to microscale. However, the rocks/coals are in deep underground that is very complex and exists some uncertainties. Therefore, new numerical simulation methods and deep explanations of fluid flow behaviors in fractured porous media are still needed.
This special issue aims at presenting recent advances in studies on the 3D fracture network reconstruction, fluid flow modeling and permeability estimation of rock fractures. We invite you to submit comprehensive review papers and original articles.
Potential topics include but are not limited to the following:
• Intelligent and secure face recognition system in Smart Cities
• Reconstruction of 3D rock fractures and permeability estimation
• Fluid flow and solute transport in fractured porous media
• Flow regime transition modeling in complicated fracture networks
• Usages of 3D printing, micro-CT scanning and scanning electron microscope (SEM) techniques
• Fracture shear behavior and shear-flow process
• Effects of thermal treatment on dynamic and physical properties of rocks
• Stability control modeling of underground surrounding rocks
Published Papers
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Open Access
EDITORIAL
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Open Access
ARTICLE
Impacts of Disk Rock Sample Geometric Dimensions on Shear Fracture Behavior in a Punch Shear Test
Tantan Zhu, Yao Li
Computer Modeling in Engineering & Sciences, Vol.126, No.2, pp. 457-477, 2021, DOI:10.32604/cmes.2021.014284
（This article belongs to this Special Issue:
Modeling and Simulation of Fluid flows in Fractured Porous Media: Current Trends and Prospects)
Abstract Punch shear tests have been widely used to determine rock shear mechanical properties but without a standard sample geometric dimension suggestion. To investigate the impacts of sample geometric dimensions on shear behaviors in a punch shear test, simulations using Particle Flow Code were carried out. The effects of three geometric dimensions (i.e., disk diameter, ratio of shear surface diameter to disk diameter, and ratio of disk height to shear surface diameter) were discussed. Variations of shear strength, shear stiffness, and shear dilatancy angles were studied, and the fracture processes and patterns of samples were investigated. Then, normal stress on the…
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Open Access
ARTICLE
Shear Induced Seepage and Heat Transfer Evolution in a Single-Fractured Hot-Dry-Rock
Hongwei Zhang, Zhijun Wan, Yixin Zhao, Yuan Zhang, Yulong Chen, Junhui Wang, Jingyi Cheng
Computer Modeling in Engineering & Sciences, Vol.126, No.2, pp. 443-455, 2021, DOI:10.32604/cmes.2021.013179
（This article belongs to this Special Issue:
Modeling and Simulation of Fluid flows in Fractured Porous Media: Current Trends and Prospects)
Abstract In the enhanced geothermal system (EGS), the injected fluid will induce shear sliding of rock fractures (i.e.,
hydroshearing), which consequently, would increase the fracture aperture and improve the heat transfer efficiency
of the geothermal reservoir. In this study, theoretical analysis, experimental research and numerical simulation
were performed to uncover the permeability and heat transfer enhancement mechanism of the Hot-Dry-Rock
(HDR) mass under the impact of shearing. By conducting the direct shear test with the fractured rock samples,
the evolution process of fracture aperture during the shearing tests was observed, during which process, cubic law
was adopted to depict the rock…
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Open Access
ARTICLE
Analysis of a Water-Inrush Disaster Caused by Coal Seam Subsidence Karst Collapse Column under the Action of Multi-Field Coupling in Taoyuan Coal Mine
Zhibin Lin, Boyang Zhang, Jiaqi Guo
Computer Modeling in Engineering & Sciences, Vol.126, No.1, pp. 311-330, 2021, DOI:10.32604/cmes.2021.011556
（This article belongs to this Special Issue:
Modeling and Simulation of Fluid flows in Fractured Porous Media: Current Trends and Prospects)
Abstract Minin-induced water inrush from a confined aquifer due to subsided floor karst collapse column (SKCC) is a type of serious disaster in the
underground coal extraction. Karst collapse column (KCC) developed in a
confined aquifer occurs widely throughout northern China. A water inrush
disaster from SKCC occurred in Taoyuan coal mine on February 3, 2013. In
order to analyze the effect of the KCC influence zone’s (KCCIZ) width and
the entry driving distance of the water inrush through the fractured channels
of the SKCC, the stress, seepage, and impact dynamics coupling equations
were used to model the seepage rule, and…
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Open Access
ARTICLE
Thermal Analysis of MHD Non-Newtonian Nanofluids over a Porous Media
Asad Ejaz, Imran Abbas, Yasir Nawaz, Muhammad Shoaib Arif, Wasfi Shatanawi, Javeria Nawaz Abbasi
Computer Modeling in Engineering & Sciences, Vol.125, No.3, pp. 1119-1134, 2020, DOI:10.32604/cmes.2020.012091
（This article belongs to this Special Issue:
Modeling and Simulation of Fluid flows in Fractured Porous Media: Current Trends and Prospects)
Abstract In the present research, Tiwari and Das model are used for the
impact of a magnetic field on non-Newtonian nanofluid flow in the presence
of injection and suction. The PDEs are converted into ordinary differential
equations (ODEs) using the similarity method. The obtained ordinary differential equations are solved numerically using shooting method along with
RK-4. Part of the present study uses nanoparticles (NPs) like TiO
2 and Al
2O
3
and sodium carboxymethyl cellulose (CMC/water) is considered as a base
fluid (BF). This study is conducted to find the influence of nanoparticles,
Prandtl number, and magnetic field on velocity and temperature profile, however,…
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Open Access
ARTICLE
Prediction of Permeability Using Random Forest and Genetic Algorithm Model
Junhui Wang, Wanzi Yan, Zhijun Wan, Yi Wang, Jiakun Lv, Aiping Zhou
Computer Modeling in Engineering & Sciences, Vol.125, No.3, pp. 1135-1157, 2020, DOI:10.32604/cmes.2020.014313
（This article belongs to this Special Issue:
Modeling and Simulation of Fluid flows in Fractured Porous Media: Current Trends and Prospects)
Abstract Precise recovery of Coalbed Methane (CBM) based on transparent
reconstruction of geological conditions is a branch of intelligent mining.
The process of permeability reconstruction, ranging from data perception
to real-time data visualization, is applicable to disaster risk warning and
intelligent decision-making on gas drainage. In this study, a machine learning
method integrating the Random Forest (RF) and the Genetic Algorithm
(GA) was established for permeability prediction in the Xishan Coalfield
based on Uniaxial Compressive Strength (UCS), effective stress, temperature
and gas pressure. A total of 50 sets of data collected by a self-developed
apparatus were used to generate datasets for…
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Open Access
ARTICLE
Experimental and Numerical Study on Anchorage Strength and Deformation Properties of Blocky Rock Mass
Junfu Zhu, Qian Yin, Hongwen Jing, Xinshuai Shi, Minliang Chen
Computer Modeling in Engineering & Sciences, Vol.125, No.2, pp. 725-753, 2020, DOI:10.32604/cmes.2020.012648
（This article belongs to this Special Issue:
Modeling and Simulation of Fluid flows in Fractured Porous Media: Current Trends and Prospects)
Abstract This study experimentally and numerically investigated the anchorage properties, bolt force evolution, deformation and stress fields of blocky
rock mass with various dip angles of joint surfaces under an applied axial
load. The results show that due to bolt reinforcement, the axial stress-strain
curves of anchorage blocky rock mass show typical strain-hardening characteristics, and compared with models without anchorage, the peak strength and
elastic modulus increase by 21.56% and 20.0%, respectively. With an increase
in axial stress, the lateral strain continuously increases, and restriction effects
of bolts reduce the overall deformation of model surfaces. The axial stressstrain curves of anchorage…
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Open Access
ARTICLE
Effect of Hole Density and Confining Pressure on Mechanical Behavior of Porous Specimens: An Insight from Discrete Element Modeling
Yuanchao Zhang, Zhiyuan Xia, Yujing Jiang, Miao Chen, Jiankang Liu, Qian Yin
Computer Modeling in Engineering & Sciences, Vol.125, No.1, pp. 259-280, 2020, DOI:10.32604/cmes.2020.011076
（This article belongs to this Special Issue:
Modeling and Simulation of Fluid flows in Fractured Porous Media: Current Trends and Prospects)
Abstract Hole-like defects are very common in natural rock or coal mass, and
play an important role in the failure and mechanical behaviors of rock or coal
mass. In this research, multi-holed coal specimens are constructed numerically
and calibrated based on UDEC-GBM models. Then, the strength, deformation
and failure behavior of the porous specimens are analyzed, with consideration
of hole density (
P) and confining pressure (
σ3). The simulation results are highly
consistent with those available experiment results, and show that the compressive
strength decreases exponentially with the increasing hole density. The strength
loss is mainly caused by the reduction of cohesion…
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Open Access
ARTICLE
Stability Control of Gob-Side Entry Retaining in Fully Mechanized Caving Face Based on a Compatible Deformation Model
Xinshuai Shi, Hongwen Jing, Jianguo Ning, Zhenlong Zhao, Junfu Zhu
Computer Modeling in Engineering & Sciences, Vol.124, No.1, pp. 315-343, 2020, DOI:10.32604/cmes.2020.07955
（This article belongs to this Special Issue:
Modeling and Simulation of Fluid flows in Fractured Porous Media: Current Trends and Prospects)
Abstract The stability control of gob-side entry retaining in fully mechanized caving face
is a typical challenge in many coal mines in China. The rotation and subsidence of the
lateral cantilever play a critical role in a coal mine, possibly leading to instability in a coal
seam wall or a gob-side wall due to its excessive rotation subsidence. Hence, the presplitting
blasting measures in the roof was implemented to cut down the lower main roof and convert
it to caved immediate roof strata, which can significantly reduce the rotation space for the
lateral cantilever and effectively control its rotation. Firstly, the…
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Open Access
ARTICLE
Solute Removal Analysis of a Large-scale Fracture Plane Considering Different Flow Paths and Different Hydraulic Head Differences
Qian Yin, Xiaojing Li, Liyuan Yu, Ming He, Richeng Liu
Computer Modeling in Engineering & Sciences, Vol.124, No.1, pp. 345-373, 2020, DOI:10.32604/cmes.2020.08204
（This article belongs to this Special Issue:
Modeling and Simulation of Fluid flows in Fractured Porous Media: Current Trends and Prospects)
Abstract An experimental and numerical study was carried out to investigate the
solute removal process through a large-scale fracture plane considering different
flow paths and hydraulic head differences. The visualization techniques were utilized in the experiment to capture the removal process images, which were then
transferred to binary images. The variations in dimensionless concentration,
which is defined as saturation of solute phase, were analyzed. With increasing
hydraulic head difference, the speed of solute removal increases and the dimensionless concentration decreases. The flow paths result in different solute distribution patterns and different mechanisms for solute removal such as advection and
diffusion, thus…
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Open Access
ARTICLE
Three-Dimensional Collapse Analysis for a Shallow Cavity in Layered Strata Based on Upper Bound Theorem
Hongtao Wang, Ping Liu, Lige Wang, Chi Liu, Xin Zhang, Luyao Liu
Computer Modeling in Engineering & Sciences, Vol.124, No.1, pp. 375-391, 2020, DOI:10.32604/cmes.2020.08270
（This article belongs to this Special Issue:
Modeling and Simulation of Fluid flows in Fractured Porous Media: Current Trends and Prospects)
Abstract Layered rock strata are observed to be common during the excavation
of tunnels or cavities, and may significantly affect the deformation and failure
characteristics of surrounding rock masses due to various complex forms and
mechanical properties. In this paper, we propose a three-dimensional axisymmetric velocity field for roof collapse of shallow cavities in multi rock layers,
by considering the influences of roof cross-section shapes, supporting pressure,
ground overload, etc. The internal energy dissipation rate and work rates of external forces corresponding to the velocity field are computed by employing the
Hoek-Brown strength criterion and its associated flow rule. Further, the…
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Open Access
ARTICLE
Numerical Study on Rock Breaking Mechanism of Supercritical CO2 Jet Based on Smoothed Particle Hydrodynamics
Xiaofeng Yang, Yanhong Li, Aiguo Nie, Sheng Zhi, Liyuan Liu
Computer Modeling in Engineering & Sciences, Vol.122, No.3, pp. 1141-1157, 2020, DOI:10.32604/cmes.2020.08538
（This article belongs to this Special Issue:
Modeling and Simulation of Fluid flows in Fractured Porous Media: Current Trends and Prospects)
Abstract Supercritical carbon dioxide (Sc-CO
2) jet rock breaking is a nonlinear impact
dynamics problem involving many factors. Considering the complexity of the physical
properties of the Sc-CO
2 jet and the mesh distortion problem in dealing with large
deformation problems using the finite element method, the smoothed particle
hydrodynamics (SPH) method is used to simulate and analyze the rock breaking process
by Sc-CO
2 jet based on the derivation of the jet velocity-density evolution mathematical
model. The results indicate that there exisits an optimal rock breaking temperature by Sc-CO
2. The volume and length of the rock fracture increase with the rising of the…
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Open Access
ARTICLE
Experimental Simulation and Numerical Modeling of Deformation and Damage Evolution of Pre-Holed Sandstones After Heat Treatment
Shuo Yang, Yuanhai Li, Xiaojie Tang, Jinshan Liu
Computer Modeling in Engineering & Sciences, Vol.122, No.2, pp. 633-659, 2020, DOI:10.32604/cmes.2020.07919
（This article belongs to this Special Issue:
Modeling and Simulation of Fluid flows in Fractured Porous Media: Current Trends and Prospects)
Abstract The deformation and damage evolution of sandstone after heat treatment greatly
influence the efficient and safe development of deep geothermal energy extraction. To
investigate this issue, laboratory confined compression tests and numerical simulations
were conducted on pre-holed sandstone specimens after heat treatment. The laboratory test
results show that the failure modes are closely related to the heat treatment temperature,
with increasing treatment temperature, the failure modes change from mixed and shear
modes to a splitting mode. The cracks always initiate from the sidewalls of the hole and
then propagate. The failure process inside the hole proceeds as follows: calm period,…
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