The Experts below are selected from a list of 45 Experts worldwide ranked by ideXlab platform
Hailing Kong - One of the best experts on this subject based on the ideXlab platform.
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the variation of Grain size distribution in Rock granular material in seepage process considering the mechanical hydrological chemical coupling effect an experimental research
Royal Society Open Science, 2020Co-Authors: Hailing Kong, Luzhen Wang, Hualei ZhangAbstract:As a common solid waste in geotechnical engineering, Rock granular material should be properly treated and recycled. Rock granular material often coexists with water when it is used as the filling material in geotechnical engineering. Water flowing in Rock granular materials is a complex progress with the mechanical-hydrological-chemical (MHC) coupling effect, i.e. the water scours in the gaps and spaces in the Rock granular material structure, produces chemical reactions with Rock Grains, Rock Grains squeeze each other under the water pressure and compression leading to re-breakage and producing secondary Rock Grains, and the fine Rock Grains are migrated with water and rushed out. In this process, Rock Grain size distribution (GSD) changes, it affects the physical and mechanical characteristics of the Rock granular materials, and even influences the seepage stability of the Rock granular materials. To study the variation of GSD in the Rock granular material considering the MHC coupling effect after the seepage process, seepage experiments of Rock Grain samples are carried out and analysed in this paper. The result is expected to have a positive impact on further studies of the properties of the Rock granular material.
Hualei Zhang - One of the best experts on this subject based on the ideXlab platform.
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the variation of Grain size distribution in Rock granular material in seepage process considering the mechanical hydrological chemical coupling effect an experimental research
Royal Society Open Science, 2020Co-Authors: Hailing Kong, Luzhen Wang, Hualei ZhangAbstract:As a common solid waste in geotechnical engineering, Rock granular material should be properly treated and recycled. Rock granular material often coexists with water when it is used as the filling material in geotechnical engineering. Water flowing in Rock granular materials is a complex progress with the mechanical-hydrological-chemical (MHC) coupling effect, i.e. the water scours in the gaps and spaces in the Rock granular material structure, produces chemical reactions with Rock Grains, Rock Grains squeeze each other under the water pressure and compression leading to re-breakage and producing secondary Rock Grains, and the fine Rock Grains are migrated with water and rushed out. In this process, Rock Grain size distribution (GSD) changes, it affects the physical and mechanical characteristics of the Rock granular materials, and even influences the seepage stability of the Rock granular materials. To study the variation of GSD in the Rock granular material considering the MHC coupling effect after the seepage process, seepage experiments of Rock Grain samples are carried out and analysed in this paper. The result is expected to have a positive impact on further studies of the properties of the Rock granular material.
Yasuto Kuwahara - One of the best experts on this subject based on the ideXlab platform.
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Laboratory studies of seismic wave propagation in inhomogeneous media using a laser Doppler vibrometer
Bulletin of the Seismological Society of America, 1997Co-Authors: Osamu Nishizawa, Xinglin Lei, Takashi Satoh, Yasuto KuwaharaAbstract:We performed physical model experiments by utilizing a laser doppler vibrometer (LDV). Because LDV converts velocity of vibration to the Doppler shift frequency, it enables very precise measurements of ultrasonic waves without any resonating element that conventional transducers usually include. A piezoelectric transducer (PZT) was used as a source of elastic waves, and the waveform was measured in a very small area of about 400 {micro}m in diameter by focusing the beam. We can easily perform very precise measurements of wave field in a physical model, and thus physical model experiments of wave propagation can simulate realistic seismic field observations. For models of inhomogeneous material, we used three granitic Rocks with different Grain sizes: Westerly granite (fine Grained), Oshima granite (medium Grained), and Inada granite (coarse Grained). Large Rock prisms, 300 x 300 x 80 to 90 mm, were used to prevent contamination by multiple reflections from the side ends in the earlier portion of waveforms. The direct P and S waves and reflected waves were identified by their travel times. Observations were made by long in-line, circular, and small-aperture arrays. When the Rock Grain size becomes comparable to the wavelength, transmitted waves are strongly attenuated by backward scattering, and a large amount of wave energy is transferred to the coda portion. Semblance plots in the time-slowness plane obtained from the small-aperture array suggest that incoherent waves become dominant as the Grain size becomes large and comparable to the wavelength.
Anthony R Kovscek - One of the best experts on this subject based on the ideXlab platform.
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mechanisms of multiphase reactive flow using biogenically calcite functionalized micromodels
Lab on a Chip, 2018Co-Authors: Wen Song, Folake Ogunbanwo, Marianne Steinsbo, Martin A Ferno, Anthony R KovscekAbstract:Dissolution of carbonate minerals in porous media is important to many instances of subsurface flow, including geological carbon dioxide (CO2) sequestration, karst formation, and crude-oil reservoir stimulation and acidizing. Of particular interest, geological CO2 storage in deep carbonate reservoirs presents a significant long-term opportunity to mitigate atmospheric carbon emissions. The reactivity of carbonate reservoirs, however, may negatively impact storage formation integrity and hence jeopardize sequestered CO2 storage security. In this work, we develop a novel biogenically calcite-functionalized microvisual device to study the fundamental pore-scale reactive transport dynamics in carbonate formations. Importantly, we discover a new microscale mechanism that dictates the overall behavior of the reactive transport phenomenon, where the reaction product, CO2, due to carbonate Rock dissolution forms a separate, protective phase that engulfs the carbonate Rock Grain and reduces further dissolution. The presence of the separate, protective CO2 phase determines overall dissolution patterns in the storage reservoir and leads to formation of preferential leakage paths. We scale these results using nondimensional numbers to demonstrate their influence on industrial CO2 storage security, safety, and capacity.
Zhang Qing-gu - One of the best experts on this subject based on the ideXlab platform.
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Characteristics and Effective Thickness of the Low Porosity and Low Permeability Reservoir
Contemporary Chemical Industry, 2014Co-Authors: Zhang Qing-guAbstract:By the theory of reservoir geology, core analysis, well logging, mud logging, thin section, scanning electron microscope, X diffraction analysis were used to establish the foundation database of the first member of Yaojia formation. Then the lithologic characteristics, reservoir sedimentary characteristics, reservoir diagenesis, pore structure and physical characteristics were determined. The results show that the first member of Yaojia formation is mainly subaqueous distributary channel of delta front facies;the Rock types are mainly lithic feldspar sandstone and feldspathic lithic sandstone, Rock Grain size are relatively coarse, mainly composed of silt and fine sand; reservoir porosity is mainly primary pores and secondary dissolution extension; reservoir porosity is mainly distributed between 10% and 20%, permeability is mainly distributed between 0.01×10-3 and 20×10-3 μm2. The limit of the lithology, physical property, oiliness, and electrical standards were determined by logging and geological comprehensive comparative study and test data. Interpretation coincidence rate was increased by 10% by 442 layer test validation of 68 Wells in the regional reservoir.
