Zobrazeno 1 - 10
of 83
pro vyhledávání: '"Zhishu YAO"'
Publikováno v:
Meitan kexue jishu, Vol 52, Iss 7, Pp 168-177 (2024)
The coal mine drilling shaft wall is a single-layer structure, and water leakage in the deep alluvium will seriously threaten mine safety. If there are construction defects in the stubble part of the well wall at the construction stage, it will lead
Externí odkaz:
https://doaj.org/article/2be6526f88a84a15a3d89d653ca6f667
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-22 (2024)
Abstract To elucidate the distribution law of the multiphase coupling slag discharge flow field in gas-lift reverse circulation during drilling shaft sinking, a numerical analysis model of gas–liquid–solid multiphase coupling slag discharge was e
Externí odkaz:
https://doaj.org/article/2d7c9f58afca4bcc85dca370c67fb762
Publikováno v:
Meitan xuebao, Vol 49, Iss 1, Pp 426-441 (2024)
Aiming at the problems of gas lift reverse circulation shaft washing slag discharge and low drilling efficiency in the application of vertical shaft drilling method in the Jurassic strata coal mines in western China, taking ϕ4.2 m advanced drilling
Externí odkaz:
https://doaj.org/article/d8379432ea5947a2b0e1fce8c33f395a
Publikováno v:
Case Studies in Construction Materials, Vol 20, Iss , Pp e02749- (2024)
To reveal the evolution mechanism of concrete permeability under stress-seepage coupling in drilling shaft linings of water-rich and weakly cemented formations, this study conducted an experimental investigation on concrete permeability under various
Externí odkaz:
https://doaj.org/article/7f2136122afd4bd5aaf1237e6b439aee
Publikováno v:
Meitan xuebao, Vol 48, Iss 11, Pp 4001-4010 (2023)
The surface movement duration is a key parameter for the evaluation of the stability of surface movement and deformation, and accurately predicting the surface movement duration under different geological conditions and mining intensity is crucial fo
Externí odkaz:
https://doaj.org/article/d30e310f154d42c8848f2b582b085c76
Publikováno v:
International Journal of Concrete Structures and Materials, Vol 16, Iss 1, Pp 1-15 (2022)
Abstract To prevent damage to shaft walls in mines due to uneven loading, the mechanical properties of a shaft wall structure made of hybrid-fiber-reinforced concrete were studied. First, through orthogonal testing, the optimal mix proportion of the
Externí odkaz:
https://doaj.org/article/a9b00ef1f88f407e9c244626b868dde3
Publikováno v:
Case Studies in Construction Materials, Vol 18, Iss , Pp e01911- (2023)
The drilling activities at the mining sites in western China generally involve an extremely high drilling depth and complex formation environment, and the external load borne by the drilling shaft lining is also very high. Hence, in this study, fiber
Externí odkaz:
https://doaj.org/article/f2c7d1f0043648b28b1f65cf0f43a7b3
Publikováno v:
Materials Research Express, Vol 11, Iss 8, p 085305 (2024)
Metakaolin has been incorporated into high-performance fiber-reinforced concrete for wellbore wall drilling to enhance its durability in strata with highly mineralized water. This study established a benchmark, utilizing fly ash, slag powder, and met
Externí odkaz:
https://doaj.org/article/f5e65c87fd574326b847f69443da3fa7
Publikováno v:
Journal of Materials Research and Technology, Vol 14, Iss , Pp 888-900 (2021)
Deep mine shafts are susceptible to rupture under dynamic loading. To solve this problem, hybrid fiber-reinforced concrete (HFRC) is proposed as a construction material for mine shaft lining. Herein, its dynamic mechanical properties are experimental
Externí odkaz:
https://doaj.org/article/dd9ec3e2787e4feaaaacc0f88eb66fc3
Publikováno v:
Applied Sciences, Vol 13, Iss 7, p 4504 (2023)
During the construction of coal mine shafts through Cretaceous water-rich stratum using the freezing method, the frozen shaft lining can break and lose stability. Hence, it is necessary to examine the mechanical properties and constitutive relationsh
Externí odkaz:
https://doaj.org/article/15862574d3db4abe89faacd8b6a29d4a