Experimental and numerical study on the indentation behavior of TBM disc cutter on hard-rock precutting kerfs by high-pressure abrasive water jet

A high-pressure water jet can break rock efficiently, which is of great potential to overcome the problems of a tunnel boring machine (TBM) in full-face hard rock tunnel digging, such as low digging efficiency and high disc cutter wear rate. Therefore, this paper presented a new tunneling method that is a TBM coupled with a high-pressure water jet. The rock failure mechanism under the coupled forces of a disc cutter and water jet was analyzed at first. Then, the finite element method (FEM) and smoothed particle hydrodynamics (SPH) method were used to establish a numerical model of rock broken by the disc cutter and water jet. Effects of parameters on rock breaking performance were studied based on the numerical model. Moreover, an experiment of the water jet cutting marble was carried out to verify the reliability of the numerical simulation. Results showed that the high-pressure water jet can increase the TBM digging efficiency and decrease the forces and wear rate of the disc cutter. The optimum nozzle diameter is 1.5 mm, while the optimum jet velocity is 224.5 m/s in this simulation. The results can provide theoretical guidance and data support for designing the most efficient system of a TBM with a water jet for digging a full-face hard rock tunnel.

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Permeability Enhancement Properties of High-Pressure Abrasive Water Jet Flushing and Its Application in a Soft Coal Seam

Frontiers in Energy Research ◽

10.3389/fenrg.2021.679623 ◽

2021 ◽

Vol 9 ◽

Author(s):

Xinzhe Zhang ◽

Piotr Wiśniewski ◽

Sławomir Dykas ◽

Guojie Zhang

Keyword(s):

High Pressure ◽

Coal Seam ◽

Water Jet ◽

Gas Pressure ◽

Theory And Practice ◽

Abrasive Water Jet ◽

Gas Drainage ◽

Permeability Enhancement ◽

Soft Coal ◽

Soft Coal Seam

High-pressure abrasive water jet flushing (HPAWJF) is an effective method used to improve coal seam permeability. In this study, based on the theories of gas flow and coal deformation, a coupled gas-rock model is established to investigate realistic failure processes by introducing equations for the evolution of mesoscopic element damage along with coal mass deformation. Numerical simulation of the failure and pressure relief processes is carried out under different coal seam permeability and flushing length conditions. Distributions of the seepage and gas pressure fields of the realistic failure process are analyzed. The effects of flushing permeability enhancement in a soft coal seam on the gas drainage from boreholes are revealed by conducting a field experiment. Conclusions can be extracted that the gas pressure of the slotted soft coal seam is reduced and that the gas drainage volume is three times higher than that of a conventional borehole. Field tests demonstrate that the gas drainage effect of the soft coal seam is significantly improved and that tunneling speed is nearly doubled. The results obtained from this study can provide guidance to gas drainage in soft coal seams regarding the theory and practice application of the HPAWJF method.

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Basis of Novel Technique for Spatial Objects Shaping With High-Pressure Abrasive Water Jet

Journal of Manufacturing Science and Engineering ◽

10.1115/1.4002376 ◽

2010 ◽

Vol 132 (5) ◽

Cited By ~ 1

Author(s):

P. J. Borkowski ◽

J. A. Borkowski

Keyword(s):

High Pressure ◽

Feed Rate ◽

Spatial Model ◽

Theoretical Basis ◽

Water Jet ◽

Abrasive Water Jet ◽

Spatial Objects ◽

Novel Technique ◽

Raster Image ◽

Novel Method

Novel method for the 3D shaping of different materials using a high-pressure abrasive water jet is presented in the paper. For the steering movement process of the jet, a principle similar to the raster image way of record and readout was used. However, respective colors of pixels of such a bitmap are connected with adequate jet feed rate that causes erosion of material with adequate depth. Thanks to that innovation, one can observe spatial imaging of the object. Theoretical basis as well as spatial model of material shaping including steering program is presented in. There are also presented experimental erosion results as well as practical examples of the object’s bas-relief made of metal.

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Investigation of the breaking manifestations of bedded shale impacted by a high-pressure abrasive water jet

Powder Technology ◽

10.1016/j.powtec.2021.11.065 ◽

2021 ◽

Author(s):

Fei Huang ◽

Zhiqi Zhao ◽

Dan Li ◽

Jianyu Mi ◽

Rongrong Wang

Keyword(s):

High Pressure ◽

Water Jet ◽

Abrasive Water Jet

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COMPUTATIONAL FLUID DYNAMICS SIMULATION OF EROSION-CORROSION IN ABRASIVE WATER JET MACHINING

Surface Review and Letters ◽

10.1142/s0218625x21500311 ◽

2021 ◽

pp. 2150031

Author(s):

H. DENİZ ADA ◽

MEHMET ERDEM ◽

KADİR GOK

Keyword(s):

High Pressure ◽

Water Jet ◽

Dynamics Simulation ◽

Abrasive Water Jet ◽

Manufacturing Method ◽

Water Jet Cutting ◽

Erosion Corrosion ◽

Computer Environment ◽

Manufacturing Methods ◽

Traditional Manufacturing

Today, conventional machining with chip or machining without chip machining manufacturing methods is used to bring to the desired dimensions sizes the machines and equipment used in the industry. However, non-traditional manufacturing methods are used in cases where traditional machining manufacturing methods are inadequate. Cutting with water jet which is one of the non-traditional manufacturing methods is commonly used in several fields of industry. Unlike traditional manufacturing methods such as turning and milling, not using of a physical cutting tool is among the advantages of the method. Abrasive water jet manufacturing method was started to be applied by adding abrasive particles in the water jet. Apart from the superior properties of the method, possible damages occur in the water jet nozzle due to processes such as cutting or drilling by applying high pressure. Erosion-corrosion is the leading damage among these damages. In this study, the erosion-corrosion in the nozzle caused by high-pressure water and abrasive during the abrasive water jet cutting process was simulated in the computer environment. In this paper, the erosion rate in the nozzle was calculated as 6,90E-06[Formula: see text]kg/m2[Formula: see text]s. This value was converted as 0,30[Formula: see text]mm (27,09[Formula: see text]mm for yearly) via developed software for 100[Formula: see text]h.

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A numerical and experimental study of oblique impact of ultra-high pressure abrasive water jet

Advances in Mechanical Engineering ◽

10.1177/1687814016636791 ◽

2016 ◽

Vol 8 (3) ◽

pp. 168781401663679 ◽

Cited By ~ 4

Author(s):

Can Kang ◽

Haixia Liu ◽

Xiuge Li ◽

Ya Zhou ◽

Xiaonong Cheng

Keyword(s):

Experimental Study ◽

High Pressure ◽

Oblique Impact ◽

Water Jet ◽

Abrasive Water Jet ◽

Ultra High Pressure

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Design of the Circular Cutting Device

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.556-562.1126 ◽

2014 ◽

Vol 556-562 ◽

pp. 1126-1128

Author(s):

Chao Kun Wei ◽

Shan Shan Tang ◽

Hao Yang

Keyword(s):

High Pressure ◽

Water Jet ◽

Abrasive Water Jet ◽

Pressure Water ◽

High Pressure Water Jet

Currently, abrasive water jet technology is widely applied to cutting while it has been difficult in circular cutting, as travel mechanism is not easy to realize or the structure is too complex. To solve this problem, this paper presents a simple circular cutting device for high-pressure water jet technology. The cutting device completes cutting work by rotating clamping devices around the center thimble through electromotor. At the same time,the paper introduces the components of the circular cutting device and analyzes the reliability of the slider part by ANSYS.

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