Results 21 to 30 of about 6,595 (218)
Effect of hydraulic radius on long-term drainage capacity of geosynthetics drains
Geotextiles and Geomembranes, 2004 The results of the long-term drainage capacity of four types of prefabricated vertical drains (PVDs) and three types of prefabricated horizontal drains (PHDs), and as well of the transmissivity of a dual function (reinforcement and drainage) geotextile (DFG) are presented. PVD, PHD and DFG are together called geosynthetics drains in this study.
Chai, Jin-Chun +2 more
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Energy Science & Engineering, 2023 Aiming at the application of hydraulic punching technology in soft, low permeability, and high gas coal seams in Changping Coal Mine, there are problems such as large workload, poor permeability enhancement effect, and the formation of “blank zones” in ...
Rui Min +4 more
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Shock and Vibration, 2021 To solve the problems of gas predrainage in deep seams with “three softs” and low-air permeability, hydraulic punching pressure relief antireflection technology is proposed on the basis of the research background of gas predrainage technology in Lugou ...
Beifang Gu, Yanling Wu
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Engineering Applications of Computational Fluid Mechanics, 2022 A major drainage systemwhich uses urban roadways as flood passages during extreme storm events has been proven to be effective and low-cost. However, to date, the amount of flow diverted at a bifurcating road crossing still could not be accurately ...
Wang Feng +6 more
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Geofluids, 2020 Mining high-gas coal seams in China has the characteristics mining of deep, high storage and low permeability, and low drainage efficiency, which seriously restrict the efficient prevention and control of mine gas disasters.
Hu Wen +7 more
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Optimal submerged waterjet for gas recovery based on Arbitrary Lagrange‐Euler
Energy Science & Engineering, 2019 This paper proposes a coupled model of waterjet cutting coal containing gas with the Arbitrary Lagrange‐Euler algorithm assistance. The dynamic evolution of coal damage and the cutting performance under different jet conditions, including jet pattern ...
Long Wang +4 more
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Meikuang Anquan, 2021 In this paper, a gas roadway with multiple coal seams in southwest China is taken as the test site, and the separate-layer hydraulic fracturing and multilayers comprehensive hydraulic fracturing are carried out.
FENG Renjun
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Advances in Civil Engineering, 2021 Based on artificial freezing engineering practice, the comprehensive technology is suggested to realize safe and fast rock cross-cut coal uncovering, which mainly includes four steps of drilling, water injection wetting coal, gas drainage, and injection ...
Heyi Ma +3 more
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White Matter and Perivascular Imaging Changes in Alzheimer's Disease and Cerebral Amyloid Angiopathy
Annals of Clinical and Translational Neurology, EarlyView.ABSTRACT Objective Peak‐width of skeletonized mean diffusivity (PSMD) and diffusion tensor imaging–analysis along the perivascular space (DTI‐ALPS), reflecting white matter integrity and glymphatic function, are altered in Alzheimer's disease (AD).
Debina Laishram +3 more
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Meikuang Anquan, 2020 The effective pressure drop radius of coal reservoir should be enlarged as far as possible to improve the gas production of CBM well. By analyzing the complementary variation law of water production and gas production during the process of CBM well ...
HU Haiyang, ZHAO Lingyun, CHEN Jie
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