Numerical research on rock breaking performance of water jet based on SPH

2015 ◽  
Vol 286 ◽  
pp. 181-192 ◽  
Author(s):  
Xiaohui Liu ◽  
Songyong Liu ◽  
Huifu Ji
Keyword(s):  
Rock Breaking ◽  
Water Jet ◽  
Numerical Research

scholarly journals Numerical Investigation of Rock Breaking Mechanisms by High Pressure Water Jet

2015 ◽  
Vol 126 ◽  
pp. 295-299 ◽  
Author(s):  
Hailong Chen ◽  
Zhaomin Li ◽  
Zhihan Gao ◽  
Yuanyuan Sun
Keyword(s):  
High Pressure ◽  
Numerical Investigation ◽  
Rock Breaking ◽  
Water Jet ◽  
Pressure Water ◽  
High Pressure Water Jet

scholarly journals Theoretical and Numerical Research on V-Cut Parameters and Auxiliary Cuthole Criterion in Tunnelling

2020 ◽  
Vol 2020 ◽  
pp. 1-13 ◽  
Author(s):  
Xiaoming Lou ◽  
Bao Wang ◽  
En Wu ◽  
Mingwu Sun ◽  
Ping Zhou ◽  
...  
Keyword(s):  
Numerical Modelling ◽  
Cutting Parameters ◽  
Rock Breaking ◽  
Theoretical Solution ◽  
Critical Depth ◽  
Forming Mechanism ◽  
Breaking Mechanism ◽  
Numerical Research ◽  
Explosive Properties ◽  
Dip Angle

This paper aims at providing a sound theoretical solution to auxiliary central hole and the cutting parameters. For this purpose, the forming mechanism of V-cut cavity for cutting blasting was performed based on the hypothetical rock breaking mechanism of V-cut blasting. A theoretical solution for increasing the critical depth of the auxiliary center cuthole and the criteria for increasing the cuthole diameter of various types of cutholes when the rock attributes, explosive properties, and cuthole dip angle are constant are proposed. (1) If charging length le < 0.75H/sin θ, no auxiliary cuthole is needed. (2) If 0.75H/sin θ < le < 0.75H/sin θ + (2∼4) × 0.1, a central vertical auxiliary hole is needed. (3) If 0.75H/sin θ + (2∼4) × 0.1 < le < 0.75(H/sin θ + Hi/sin θi), a shallow inclined hole is needed. (4) If le > 0.75(H/sin θ + Hi/sin θi), both the central vertical cuthole and the shallow inclined cuthole are needed. Meanwhile, the theoretical solution was verified by numerical modelling with ANSYS/LS-DYNA. Moreover, the field implementation of the V-cut and the auxiliary hole effectively improved the blasting effect in both efficiency and economy.

scholarly journals Rock Breaking Performance of TBM Disc Cutter Assisted by High-Pressure Water Jet

2020 ◽  
Vol 10 (18) ◽  
pp. 6294
Author(s):  
Fengchao Wang ◽  
Dapeng Zhou ◽  
Xin Zhou ◽  
Nanzhe Xiao ◽  
Chuwen Guo
Keyword(s):  
High Pressure ◽  
Hard Rock ◽  
Rock Breaking ◽  
Water Jet ◽  
Disc Cutter ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
Full Face ◽  
Rock Tunnel ◽  
Digging Efficiency

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.

scholarly journals Experiment on Conical Pick Cutting Rock Material Assisted with Front and Rear Water Jet

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Xiaohui Liu ◽  
Songyong Liu ◽  
Lie Li ◽  
Xinxia Cui
Keyword(s):  
Cutting Tools ◽  
Rock Breaking ◽  
Water Jet ◽  
Break Rock ◽  
Conical Pick ◽  
Advantages And Disadvantages ◽  
Pressure Water ◽  
Quantitative Results ◽  
Conical Picks ◽  
High Pressure Water Jet

Conical picks are one kind of cutting tools widely used in engineering machinery. In the process of rock breaking, the conical pick bears great cutting force and wear. To solve the problem, a new method, conical pick assisted with high pressure water jet, could break rock effectively, and four different configuration modes of water jet were presented. In this paper, based on the analysis of the different water jet configuration’s advantages and disadvantages, experiments on front water jet, new typed rear water jet, and the combination of those two water jet configuration modes were conducted to study the assisting cutting performance and obtain the quantitative results.

Experimental Study on Rock Breaking with Impacting Water Jet by Modulation of Chaos

2012 ◽  
Vol 535-537 ◽  
pp. 1751-1754 ◽  
Author(s):  
Chang Liu Tian ◽  
Xue Li Cheng ◽  
Wei Wang
Keyword(s):  
Experimental Study ◽  
High Pressure ◽  
Mass Loss ◽  
Rock Breaking ◽  
Water Jet ◽  
Breaking Effect ◽  
Erosion Depth ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
Pump Pressure

The experiment focused on the contrast with rock breaking effect of impacting water jet by modulation of chaos and common cavitation jet. Investigated the influences of various water jet parameters and conditions on rock breaking, such as standoff distance, pump pressure, transverse speed and erosion time and the mass loss and erosion depth were measured in the experiment. The results show that the impacting water jet by modulation of chaos can efficiently use the energy of water jet and increase ability in rock-breaking, which will have a wide application prospect in high pressure water jet technology field.

Experimental Investigation of Hard Rock Breaking Using a Conical Pick Assisted by Abrasive Water Jet

2020 ◽  
Vol 53 (9) ◽  
pp. 4221-4230 ◽  
Author(s):  
Songyong Liu ◽  
Fangyue Zhou ◽  
Hongsheng Li ◽  
Yueqiang Chen ◽  
Fengchao Wang ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Hard Rock ◽  
Rock Breaking ◽  
Water Jet ◽  
Abrasive Water Jet ◽  
Conical Pick
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