Results 1 to 10 of about 49 (34)

CFD–DEM method is used to study the multi-phase coupling slag discharge flow field of gas-lift reverse circulation in drilling shaft sinking

Scientific Reports
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 established by CFD–
Longhui Guo, Hua Cheng, Zhishu Yao, Chuanxin Rong, Zongjin Wang, Xiaoyun Wang   +5 more
doaj   +6 more sources

Wear evaluation method of drilling shaft sinking hob based on rock slag morphology and rock abrasiveness [PDF]

Meitan xuebao
Aiming 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, Bao XIE, Zhishu YAO, Chuanxin RONG, Jian LIN   +4 more
doaj   +3 more sources

Numerical analyses of the influences of rock properties and joints on rock fragmentation in shaft sinking by drilling method

Scientific Reports
The 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, Xin Huang, Jihuan Han   +3 more
doaj   +5 more sources

Calibration of Ultrasonic Transducer Based on Ultrasonic Logging Instrument for Shaft Sinking

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, Xiaoan Si, Hui Zhang, Fengying Ma, Peng Ji, Hui Yao   +5 more
doaj   +2 more sources

Simultaneous Operations of Pregrouting and Shaft Drilling in Shaft Construction

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, Xuhai Feng, Shengsheng Li, Liming Fan, Changwu Liu   +4 more
doaj   +2 more sources

Research on vertical structure stability before cementing ultra-deep wellbore by drilling method

Meitan xuebao
To address the problem of vertical stability of ultra-deep wellbore by drilling method, firstly, the results of the equation of critical height of equal section for non-full counterweighted water drilled wellbore are compared with the results of the ...
Renliang SHAN, Tianyu HAN, Guoye JING, Jie TAN, Weijie LI, Dongjie QIAO, Zhenyu XU, Xinpeng FU   +7 more
doaj   +2 more sources

Rotary cutting test on rock-breaking mechanism and efficiency of milled-tooth rolling cutters for shaft sinking by drilling methods

Scientific Reports
To 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, Hua Cheng, Jian Lin, Zhishu Yao, Longhui Guo, Liangliang Zhang   +5 more
openaire   +5 more sources

Study on the flow field of multi-phase coupling slag discharge and the influencing factors of slag discharge effect in gas lift reverse circulation of drilling shaft sinking

International Journal of Coal Science & Technology
Combined 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, Zhishu Yao, Chuanxin Rong, Guang Yang, Xiaoyun Wang, Yu Fang, Bao Xie   +7 more
doaj   +2 more sources

Comprehensive treatment technology for wellbore deflection in thick loose bed and thin bedrock formation

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, PENG Shilong, YAO Zhishu, RONG Chuanxin, CAI Haibing   +4 more
doaj   +1 more source

Excavation and drilling at a spent-fuel test facility in granitic rock [PDF]

, 1981
Funding for a project to test the feasibility of safe and reliable storage and retrieval of spent fuel from a commercial nuclear reactor was approved by the Department of Energy on June 2, 1978. By May 28, 1980, 11 spent-fuel assemblies had been emplaced
Patrick, W.C., Mayr, M.C.
core   +1 more source