Yuedu Chen
Tsinghua University
Surface roughnessBiot numberHeat recovery ventilationGeologySupercritical carbon dioxideTerzaghi's principleComposite materialAcoustic emissionPermeability (earth sciences)Reynolds numberTortuosityGeotechnical engineeringMaterials scienceCompactionOverburden pressureShear stressFractal dimensionHeat transfer coefficientDirect shear testConvective heat transferFracture (geology)Heat transferMechanicsAsperity (materials science)Streamlines, streaklines, and pathlinesFlow (psychology)GroundwaterEffective stressStress (mechanics)Fluid dynamicsShear (geology)
18Publications
5H-index
139Citations
Publications 19
Newest
#1Guihong Liu (THU: Tsinghua University)H-Index: 3
#2Zhihong Zhao (THU: Tsinghua University)H-Index: 20
Last. Guiling WangH-Index: 2
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Abstract null null Numerical models can explicitly characterize fluid flow and heat transfer processes in rock fractures including randomly distributed asperities and contacts and have been widely used to understand the behaviors of fluid flow and heat transfer in fractured rocks. The differences between three-dimensional and two-dimensional numerical models for single rock fractures were compared in terms of fluid flow and heat transfer behaviors and properties. Both the artificial fractures cr...
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#1Yuedu Chen (THU: Tsinghua University)H-Index: 5
Last. Huan Peng (THU: Tsinghua University)H-Index: 3
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Abstract null null Numerous intersected rock fractures constitute the fracture network in enhanced geothermal systems. The complicated convective heat transfer behavior in intersected fractures is critical to the heat recovery in fractured geothermal reservoirs. A series of three-dimensional intersected fracture models is constructed to perform the flow-through heat transfer simulations. The geometry effects of dead-end fractures (DEFs) on the heat transfer are evaluated in terms of intersected ...
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Abstract The evolution of fracture geometries caused by asperity damage and gouge formation during the shear significantly affect fluid flow in rock fractures . In this research, a cylindrical sandstone sample was fractured by using the Brazilian splitting test. Fluid flow tests and 3D scanning methods were performed on the fractured sample when it was sheared, to examine how shear-induced alteration of fracture geometries affected the permeability. A simplified modeling algorithm was proposed t...
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#1Delei Shang (THU: Tsinghua University)
#1Delei Shang (THU: Tsinghua University)H-Index: 5
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Abstract Shear behavior of core samples from a deep geothermal exploration well was investigated using direct shear tests. The fracturing process inside the intact rock samples during shear was monitored using AE technique. The results show that three shear stages including compaction, quasi-elastic and failure phases can be easily divided based on the shear stress-shear displacement or the cumulative AE parameters-shear displacement curves. Three characteristic stresses in terms of crack initia...
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#1Yuedu Chen (McGill University)H-Index: 5
#2A.P.S. Selvadurai (McGill University)H-Index: 36
Last. Zhihong Zhao (THU: Tsinghua University)H-Index: 20
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Abstract A series of fracture geometries of an artificially tensile fractured sandstone, measured during the hydraulic tests at increasing confine stresses, were adopted to build 3D fracture models. At each stress level, four groups of flow simulations with increasing injection flow rates were conducted, to examine how voids and contact alterations due to stress changes affect the flow characteristics within the fracture. The results show that the simulated normalized apparent transmissivity mat...
2 CitationsSource
#1Zhihong Zhao (THU: Tsinghua University)H-Index: 2
#1Zhihong Zhao (THU: Tsinghua University)H-Index: 20
Last. Qiang Yang (THU: Tsinghua University)H-Index: 16
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Abstract The effective stress coefficient is critical to accurately predict the hydromechanical coupling behavior of single water-bearing rock fractures. The physical meaning of the effective stress coefficient in a rough rock fracture is understood as the ratio of the nominal fracture surface occupied by water to the total fracture surface area. To overcome the difficulty of measuring contact ratio changes in rough rock fractures under normal loading and water pressure, a new effective stress c...
1 CitationsSource
#1Yuedu Chen (THU: Tsinghua University)H-Index: 5
#2Chongyuan ZhangH-Index: 1
Last. Zhao XingguangH-Index: 1
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A clear understanding of shear behaviors of granite fractures with high temperatures undergoing water-cooling treatment is important in enhanced geothermal system (EGS). Two types of fractured Gonghe granite specimens, containing either a Brazilian-induced artificial fracture and or a pre-existing natural fracture, respectively, were considered. Before direct shear tests, all specimens were suffered from slow heating and rapid water-cooling treatment, and the thermal treatment temperatures range...
4 CitationsSource
#1Dong Zhou (Tongji University)H-Index: 1
#1Dong Zhou (THU: Tsinghua University)H-Index: 2
Last. Wenqi Ding (Tongji University)H-Index: 13
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Abstract Fractures in rock masses not only are main flow conduit for groundwater, but also provide planes of weakness on which further displacement can more readily occur. Grouting has been widely used to reduce the permeability of fractured rocks, as well as to improve the stability of fractured rocks. Therefore, fractures infilled with grout appear extensively in practice, and may be subjected to different in-situ stress conditions during the construction and operation life of tunnels and unde...
1 CitationsSource
#1Yuedu ChenH-Index: 5
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#1Yuedu Chen (THU: Tsinghua University)H-Index: 5
#2Zhihong Zhao (THU: Tsinghua University)H-Index: 20
Abstract A clear understanding of the convective heat transfer characteristics in the three-dimensional (3D) rough rock fracture is important for evaluating heat recovery in fractured reservoirs. A granite sample containing a Brazilian-induced artificial fracture, which was tested at increasing normal compressive stresses, was adopted to build 3D numerical models for rough rock fractures. At each stress level, flow-through simulation tests with different injection velocities were performed to ex...
7 CitationsSource