The Experts below are selected from a list of 243 Experts worldwide ranked by ideXlab platform
Gao-feng Zhao - One of the best experts on this subject based on the ideXlab platform.
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A Preliminary Study of 3D Printing on Rock Mechanics
Rock Mechanics and Rock Engineering, 2015Co-Authors: Gao-feng ZhaoAbstract:3D printing is an innovative manufacturing technology that enables the printing of objects through the accumulation of successive layers. This study explores the potential application of this 3D printing technology for Rock Mechanics. Polylactic acid (PLA) was used as the printing material, and the specimens were constructed with a “3D Touch” printer that employs fused deposition modelling (FDM) technology. Unconfined compressive strength (UCS) tests and direct tensile strength (DTS) tests were performed to determine the Young’s modulus (E) and Poisson’s ratio (υ) for these specimens. The experimental results revealed that the PLA specimens exhibited elastic to brittle behaviour in the DTS tests and exhibited elastic to plastic behaviour in the UCS tests. The influence of structural changes in the mechanical response of the printed specimen was investigated; the results indicated that the mechanical response is highly influenced by the input structures, e.g., granular structure, and lattice structure. Unfortunately, our study has demonstrated that the FDM 3D printing with PLA is unsuitable for the direct simulation of Rock. However, the ability for 3D printing on manufactured Rock remains appealing for researchers of Rock Mechanics. Additional studies should focus on the development of an appropriate substitution for the printing material (brittle and stiff) and modification of the printing technology (to print 3D grains with arbitrary shapes).
Zhangxin Chen - One of the best experts on this subject based on the ideXlab platform.
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Rock Mechanics of shear rupture in shale gas reservoirs
Journal of Natural Gas Science and Engineering, 2016Co-Authors: Shigang Yang, Ray Rui, Zhangxin ChenAbstract:Abstract Hydraulic fracturing is an effective technology to improve shale gas wells production. The key problem in shale gas well hydraulic fracturing is opening hydraulic fractures to connect natural fractures and weak planes, in turn, creates the fracture network. The shear failure of matrix, natural fracture and weak plane are the main Rock rupture models used in shale gas reservoirs. In this paper, firstly, a bottom hole pressure calculation model is built to show that large hole perforations and big pipeline diameters should be used to decrease perforation friction. Secondly, shale Rock, natural fracture and weak plane shear failure models, based on Rock Mechanics theory, are presented. The calculated results show that horizontal differential principal stress has a significant influence on shear failure and the slippage of natural fracture and weak plane. A higher value of differential principal stress indicates a lower shale Rock shear failure pressure, which brings benefits to weak plane slippage. Elastic modulus and Poisson's ratio all have effects on weak plane shear slippage. The influences of elastic modulus on shear slippage have a greater impact than Poisson's ratio. A reasonable dip angle of weak plane is also provided to enhance weak plane slippage. The practical-approach built in the paper does not require more Rock Mechanics parameters. The results have potential to enrich shale Rock shear rupture theory and benefit fracture mesh system research.
Guoqing Liu - One of the best experts on this subject based on the ideXlab platform.
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Rock Mechanics Characteristics Test and Optimization of High-Efficiency Mining in Dajishan Tungsten Mine
Geofluids, 2018Co-Authors: Kang Zhao, Gu Shuijie, Yajing Yan, Li Qiang, Wanqi Xiao, Guoqing LiuAbstract:Rock Mechanics test is not only the basis for obtaining the mechanical parameters of Rock but also an important means for studying Rock Mechanics and engineering. In this paper, the uniaxial compression deformation test, Brazilian splitting test, and cornea pressure shear test are carried out for Rocks in the Dajishan tungsten mine. The basic mechanical parameters such as uniaxial compressive strength, tensile strength, elastic modulus, Poisson’s ratio, and internal friction angle of ore Rock and surrounding Rock are obtained. Meanwhile, damage characteristics of Rock are deeply studied and analyzed under different experimental conditions. According to Rock Mechanics parameters which are obtained from indoor Rock Mechanics tests, three design schemes of stope structure parameters are optimized by using the FLAC3D numerical simulation software. On the premise of ensuring the stability of the stope structure, the recovery rate of ore and the production capacity of the stope are taken into consideration. It is suggested that the second scheme should be adopted for mines (18 m for ore room and 7 m for ore pillar), which provides scientific guidance for the safe and efficient mining of mines.
Ahmad Ghassemi - One of the best experts on this subject based on the ideXlab platform.
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a review of some Rock Mechanics issues in geothermal reservoir development
Geotechnical and Geological Engineering, 2012Co-Authors: Ahmad GhassemiAbstract:Rock Mechanics and geomechanical studies can provide crucial information for economic geothermal reservoir development. Although significant progress has been made in reservoir geoMechanics, technical challenges specific to the geothermal area (high temps, data collection, experimentation issues) have prevented widespread use of geoMechanics in geothermal reservoir development. However, as the geothermal industry moves to develop more challenging resources using the concept of enhanced geothermal systems (EGS), and to maximize productivity from conventional resources, the need for improved understanding of geomechanical issues and developing specific technologies for geothermal reservoirs has become critical. Rock Mechanics research and improved technologies can impact areas related to in-situ stress characterization, initiation and propagation of artificial and natural fractures, and the effects of coupled hydro-thermo-chemo-mechanical processes on fracture permeability and induced seismicity. Rock Mechanics/geoMechanics research, including experimental and theoretical investigations as well as numerical and analytical solutions, has an important role in optimizing reservoir design and heat extraction strategies for sustainable geothermal energy development. A number of major areas where Rock Mechanics research can facilitate geothermal systems development are reviewed in this paper with particular emphasis on EGS design and management.
Shigang Yang - One of the best experts on this subject based on the ideXlab platform.
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Rock Mechanics of shear rupture in shale gas reservoirs
Journal of Natural Gas Science and Engineering, 2016Co-Authors: Shigang Yang, Ray Rui, Zhangxin ChenAbstract:Abstract Hydraulic fracturing is an effective technology to improve shale gas wells production. The key problem in shale gas well hydraulic fracturing is opening hydraulic fractures to connect natural fractures and weak planes, in turn, creates the fracture network. The shear failure of matrix, natural fracture and weak plane are the main Rock rupture models used in shale gas reservoirs. In this paper, firstly, a bottom hole pressure calculation model is built to show that large hole perforations and big pipeline diameters should be used to decrease perforation friction. Secondly, shale Rock, natural fracture and weak plane shear failure models, based on Rock Mechanics theory, are presented. The calculated results show that horizontal differential principal stress has a significant influence on shear failure and the slippage of natural fracture and weak plane. A higher value of differential principal stress indicates a lower shale Rock shear failure pressure, which brings benefits to weak plane slippage. Elastic modulus and Poisson's ratio all have effects on weak plane shear slippage. The influences of elastic modulus on shear slippage have a greater impact than Poisson's ratio. A reasonable dip angle of weak plane is also provided to enhance weak plane slippage. The practical-approach built in the paper does not require more Rock Mechanics parameters. The results have potential to enrich shale Rock shear rupture theory and benefit fracture mesh system research.
