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 +5 more
doaj +8 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 +3 more
doaj +6 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 +4 more sources
Wear evaluation method of drilling shaft sinking hob based on rock slag morphology and rock abrasiveness [PDF]
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 +4 more sources
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. The rock-breaking mechanisms and efficiency of the cutter were systematically investigated.
Xiaoyun Wang +5 more
exaly +6 more sources
Simultaneous Operations of Pregrouting and Shaft Drilling in Shaft Construction [PDF]
Advances in Civil Engineering, 2020 In shaft construction, conducting shaft drilling and pregrouting simultaneously is expected to speed up the sinking rate and save the cost. Reasonable determination of the spatial locations of the drilled shaft and grouting holes and proper defining of ...
Zhipeng Xu +4 more
doaj +2 more sources
International Journal of Coal Science & 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 +7 more
doaj +2 more sources
Mathematical model of velocity and distribution law in gas lift reverse circulation well washing flow field for drilling shaft sinking [PDF]
Scientific ReportsHua Cheng, Longhui Guo, Yao Zhishu
exaly +2 more sources
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
Meitan kexue jishuThe drilling method has been successfully applied in the shaft construction of deep water-bearing weak cemented bedrock in the west, which shows the development direction of less people, safety, green and intelligent well construction technology.
Hua CHENG +7 more
doaj +1 more source