Results 1 to 10 of about 489 (102)
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 +5 more
doaj +2 more sources
Numerical investigation on rock‐breaking mechanism and cutting temperature of compound percussive drilling with a single PDC cutter [PDF]
Energy Science & Engineering, 2021 Compound percussive drilling technology is a new method to improve the rock‐breaking efficiency in deep hard formation. In order to study the rock‐breaking mechanism of compound impact drilling, the thermal‐structure coupling simulation of the dynamic ...
Wei Wang +5 more
doaj +3 more sources
The effects of process parameters on the rock-breaking efficiency of multi-nozzle jet
Journal of Petroleum Science and Engineering, 2021 Abstract This paper examines the effect of multi-nozzle bit on sandstone specimens by means of numerical simulation and experiment, and the rationality is verified. Numerically, the effects of jets with different diameters and angles on rock were simulated by using LS-DYNA, and the rock-breaking shapes of jets with different angles are analyzed ...
Liu Yanbao, Yanqing Wu, Xuelin Yang
exaly +2 more sources
Research on influencing factors of rock breaking efficiency under ultrasonic vibration excitation
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 +3 more
doaj +2 more sources
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 +6 more
doaj +3 more sources
Influences of Microwave Irradiation on Rock-Breaking Efficiency of a Reduced-Scale TBM Cutter
Applied Sciences (Switzerland), 2023 To explore the influences of microwave irradiation on the rock-breaking efficiency of tunnel boring machine (TBM) cutters, a multimode cavity with a microwave power of 2100 W was used to conduct microwave irradiation tests on Chifeng basalt for different durations.
Gaoming Lu, Zhou Jianjun
exaly +3 more sources
Engineering ReportsIn 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 +5 more
doaj +2 more sources
Research on the modulation mechanism and rock breaking efficiency of a cuttings waterjet
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 +5 more
doaj +2 more sources
Energy Exploration and ExploitationTo expedite drilling operations in hard rock of coal mines, a new type of impact-shear drill bit was developed, and its mechanism of speed-up and efficiency increase was studied. The RHT constitutive model was used to describe the structural behavior of rock, and the rock-breaking simulation model of full-size bit was established. Compared with PDC bit
Pei Ju
exaly +3 more sources
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.
Xiaoyun Wang +5 more
doaj +2 more sources