Results 41 to 50 of about 9,646,321 (185)
An impedance approach to reduce the contact-instability whilst drilling with active heave compensation [PDF]
, 2012 The bit-bounce, or contact-instability, phenomenon which occurs in the drill string suspended from a floating vessel with an active drill string compensator to maintain a steady weight on the drill bit is investigated.
Hatleskog, Jan, Dunnigan, Mathew Walter
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Strain energy analysis of floor heave in longwall gateroads [PDF]
Royal Society Open Science, 2018 Floor heave in longwall gateroads is a severe issue that affects mining safety and efficiency. Researchers, however, have limited understanding on the floor heave mechanism because the deformation of post-failure rocks in the floor was seldom considered ...
Meng Wang +3 more
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, 2023 Severe extrusion floor heave is the most common type of failure of floors in deep roadways, and it is also a major problem restricting the safe and efficient mining of deep coal resources.
Liuan Zhao +7 more
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Study on floor heave mechanism and control technology of roadway based on slip line field theory
矿业科学学报, 2021 Based on the slip line field theory, the slip line field model of roadway floor is established.Taking 1021 roadway of Huipodi coal mine in Shanxi Province as the engineering background, the mechanism of asymmetric floor heave of roadway is studied, and ...
Cheng Hui +5 more
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Meikuang Anquan, 2022 Aiming at the serious problem of floor heave of the high-stress deep roadway, take 4# bottom-draining roadway in the north wing of the first mining area of Chiyu Coal Mine as an example, the law of non-linear large deformation of the floor of the roadway
XIONG Huaixin +6 more
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Yantu gongcheng xuebao, 2022 Under the complex stress environment of deep high ground stress and interlayer weak interlayer (structural surface), the deformation of the surrounding rock of composite coal (rock) roadway is severe, and the floor heave is particularly prominent.
ZHANG Dong 1, BAI Jian-biao 1, 2, YAN Shuai 2, WANG Rui 1, MENG Ning-kang 1, WANG Gong-yuan 1
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Energies, 2023 Due to their tense mining succession relationship, gob-side roadways may undergo significant deformation under multi-mining pressure. In this article, many methods, such as on-site research, a theoretical analysis, a numerical simulation and an ...
Deqiu Wang +11 more
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Control of floor heaves with steel pile in gob-side entry retaining
International Journal of Mining Science and Technology, 2016 Abstract A new approach named as steel pile method is innovatively proposed in this study to control severe floor heaves in gob-side entry retaining. It is required that the steel piles be installed in the floor corners with a certain interval before the influence of the dynamic pressure induced by current panel extraction. Using numerical simulation
Ying Xu, Jin Chen, Jianbiao Bai
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, 2023 Aiming at the problems of large deformation, long duration, and difficult control of floor heave in gob-side entry driving in weakly cemented soft rock, this paper takes the weakly cemented soft rock mining area in Western China as the engineering ...
Fenghai Yu +5 more
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Control Technology of Soft Rock Floor in Mining Roadway with Coal Pillar Protection: A case study
Energies, 2019 This study considered the mining roadway with coal pillar protection in the fully mechanized caving face of the Dananhu No.1 Coal Mine, China. Theoretical analysis, numerical simulation, and field tests were conducted, and the stress environment ...
Housheng Jia +4 more
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