Results 1 to 10 of about 141,334 (202)

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

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.
Xiaoyun Wang, Hua Cheng, Jian Lin, Zhishu Yao, Longhui Guo, Liangliang Zhang   +5 more
doaj   +5 more sources

Rock‐breaking mechanism and efficiency of straight‐swirling mixed nozzle for the nondiagenetic natural gas hydrate in deep‐sea shallow [PDF]

Energy Science & Engineering, 2020
Jet breaking using a high‐pressure nozzle is one solution for breaking natural gas hydrate (NGH) formations, creating a larger breaking volume and fluidizing broken solid fragments.
Yang Tang, Peng Sun, Guorong Wang, Biwei Fu, Jiaxin Yao   +4 more
doaj   +6 more sources

Identifying Effective Rock-Breaking Ratio Based on Rock Chip Information for Rock-Breaking Efficiency Evaluation of TBM [PDF]

Geofluids, 2023
The rock chip information (shape, size, and particle size distribution) could comprehensively reflect the characteristics of rock mass and rock-breaking efficiency of TBM.
Chuigang Zeng, Changbin Yan, Gaoliu Li, Xiao Xu, Fengwei Yang, Weilin Su   +5 more
doaj   +3 more sources

Study on rock-breaking efficiency evaluation of TBM disc cutters based on Rostami prediction equations [PDF]

Frontiers in Earth Science, 2023
As the main cutting tool of Tunnel Boring Machine (TBM) for rock-breaking, the rock-breaking efficiency of TBM disc cutters directly affects the TBM’s boring speed, which in turn affects the overall progress of the tunnelling project. Therefore, a simple
Guanghong Zhou, Xuchun Wang, Ding Wang, Ding Wang, Minhe Luo, Zhanpeng Hao, Wenrui Wu   +6 more
doaj   +5 more sources

Research the Surrounding Rock Pressure and Temperature Effect on the Rock‐Breaking Efficiency of TBM Cutter [PDF]

Engineering Reports
In the process of rock breaking, the surrounding rock pressures exert a remarkable influence on the rock‐breaking efficiency of disc cutters. This study focuses on the rock‐breaking efficiency of tunnel breaking machine (TBM) disc cutters under varying ...
Peng Zhou, Xiaotong Ma, Jianxu Shang, Tianyu Zhang, Jiacan Xu, Zinan Wang   +5 more
doaj   +3 more sources

Research on influencing factors of rock breaking efficiency under ultrasonic vibration excitation [PDF]

AIP Advances, 2023
The ultrasonic vibration rock-breaking technique shows broad application prospects in the hard-rock-breaking domain. The rock-breaking efficiency strongly depends on vibration parameters.
Zhanbiao Yang, Xufeng Wang, Lei Zhang, Jiyao Wang   +3 more
doaj   +3 more sources

Study on the mechanism of multidimensional cutting teeth and the influencing factors of rock breaking efficiency. [PDF]

PLoS One
The innovative cutting mechanism of multi-dimensional teeth presents a groundbreaking approach to drill bit design, particularly optimizing drilling efficiency in challenging geological formations such as interlayers and gravel-rich layers within the Changqing Oilfield.
Chen L, Li D, He J, Meng L, Chi Q, Li G, Chen W, Zhao Y, Yi X, Xia C.   +9 more
europepmc   +5 more sources

Study on the Mechanism of High-Efficiency Rock Breaking by Hydraulic Jet Based on Explicit Dynamics [PDF]

Processes, 2023
High-efficiency rock breaking by hydraulic jetting is the key to radial horizontal drilling technology. In order to improve the drilling efficiency of hydraulic jet rock breaking in radial horizontal wells, based on LS-Dyna display dynamics, a numerical simulation model of single-nozzle jet rock breaking was established to analyze the influence of ...
Gang Bi
exaly   +5 more sources

Physical Simulation Experiment on the Rock Breaking Efficiency of Pulse Type Controllable Shock Wave. [PDF]

ACS Omega
Given that conducting controllable shock wave tests in actual rock formations underground in coal mines affects coal mine production with the parameters required for equipment design and incurs significant costs, a series of ground tests were conducted separately. First, the impact of energy storage on rock breaking efficiency was analyzed.
Wang S, Zhang S, Ma L, Zhao Y, Gao L, Cao Y, Xie P.   +6 more
europepmc   +5 more sources

Research on the modulation mechanism and rock breaking efficiency of a cuttings waterjet [PDF]

Energy Science & Engineering, 2019
The feasibility of a cuttings waterjet directly modulated in the bottom hole is discussed from the aspects of cuttings suction and rock‐breaking efficiency.
Peng Wang, Bo Zhao, Hongjian Ni, Zhina Li, Yuandong Liu, Xinyong Chen   +5 more
doaj   +3 more sources