Results 1 to 10 of about 115 (84)
Rotary cutting test on rock-breaking mechanism and efficiency of milled-tooth rolling cutters for shaft sinking by drilling methods [PDF]
Scientific ReportsTo address the low rock-breaking efficiency of milled-tooth rolling cutters used for shaft sinking via drilling methods in the Jurassic strata of Western China, this study conducted rotational cutting tests using a mechanical rock-breaking test platform.
Hua Cheng +2 more
exaly +5 more sources
CFD–DEM method is used to study the multi-phase coupling slag discharge flow field of gas-lift reverse circulation in drilling shaft sinking [PDF]
Scientific ReportsTo 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 established by CFD–
Longhui Guo, Hua Cheng, Yao Zhishu
exaly +5 more sources
Mathematical model of velocity and distribution law in gas lift reverse circulation well washing flow field for drilling shaft sinking [PDF]
Scientific ReportsTo reveal the velocity distribution law of a gas lift reverse circulation well washing flow field in drilling shaft sinking, a velocity mathematical model of well washing flow field is established.
Longhui Guo, Hua Cheng, Yao Zhishu
exaly +5 more sources
Numerical analyses of the influences of rock properties and joints on rock fragmentation in shaft sinking by drilling method [PDF]
Scientific ReportsThe mechanical rock-crushing efficiency is directly influenced by rock properties and joint structure. Tipped-hob is widely used in the construction of shafts.
Pingping Xu, Jiuqun Zou, Jihuan Han
exaly +5 more sources
International Journal of Coal Science and TechnologyCombined with the advanced drilling of the central return air shaft in Kekegai Coal Mine, the distribution law of slag discharge flow field by drilling method and the influencing factors of slag discharge effect are studied.
Longhui Guo, Hua Cheng, Chuanxin Rong
exaly +3 more sources
Calibration of Ultrasonic Transducer Based on Ultrasonic Logging Instrument for Shaft Sinking [PDF]
Sensors, 2022 High-precision logging equipment is critical for measuring the borehole diameter and drilling offset in coal mining and petroleum drilling. We propose a module composition and positioning principle for an ultrasonic transducer based on an ultrasonic ...
Maoyong Cao +5 more
doaj +2 more sources
Meitan xuebaoAiming at the serious wear problem of hob in deep and large vertical shaft constructed by drilling method in Jurassic strata in western China, a method for evaluating the wear of hob in drilling method is put forward, taking the drilling method of ...
Hua CHENG +4 more
doaj +2 more sources
Meitan kexue jishu, 2023 The shaft is a key project, including the mining of shaft engineering minerals and the development and utilization of underground space. As the lower part of the proposed shaft has the advantage of a production system, the use of gravity slag removal is ...
LIU Zhiqiang +6 more
doaj +1 more source
Meitan kexue jishu, 2023 Aiming at the technical problems of comprehensive treatment of shaft deflection in thick loose bed and thin bedrock strata, taking the ground grouting treatment engineering of the deflected shaft in Guotun Coal Mine in Juye Mining Area, Shandong Province
CHENG Hua +4 more
doaj +1 more source
Yantu gongcheng xuebao, 2022 The drilling with pre-stressed concrete pipe cased pile (Referred to as DPC pile) is a typical non-squeezing soil PHC pipe pile foundation. During the process of its hole drilling, soil dumping and pile sinking, the hole collapse around its pile shaft ...
HOU Zhen-kun 1, 2, 3, TANG Meng-xiong 1, 3, HU He-song 1, LIU Chun-lin 1, SU Ding-li 1
doaj +1 more source