Numerical investigation of hard rock breakage by high-pressure water jet assisted indenter impact using the coupled SPH/FEM method

The high pressure waterjet is widely applied for mine industry, mechanical manufacture, environmental engineering, and medicine field due to its particular characteristic. Recently, the application of high pressure waterjet for gas drainage in mine has been receiving increasing attention with the development of exploitative technology. The micro-damage mechanism of coal under high pressure water jet is key to drain gas effectively. Based on damage mechanics and rock dynamics, the paper analyzed the micro-structure deformation and damage of rock and the impulsive effect under high pressure water jet and developed the dynamic model. Further, on the assumption of that rock was homogeneous and isotropic, a computational model was established based on the Arbitrary Lagrangian Eulerian (ALE) fluid-solid coupling penalty function method. The rock damage under high pressure water jet was simulated by the dynamic contact method. The results showed that the damage and breakage of ruck was mainly attributed to impacting effect and was characterized by local effect, and the evolvement of rock breakage went through three stages and the figure of rock breakage trended a funnel. On the whole, numerical results agreed with experimental results.

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Numerical Investigation of Rock Breaking Mechanisms by High Pressure Water Jet

Procedia Engineering ◽

10.1016/j.proeng.2015.11.246 ◽

2015 ◽

Vol 126 ◽

pp. 295-299 ◽

Cited By ~ 3

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

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Breakage mechanism of hard-rock penetration by TBM disc cutter after high pressure water jet precutting

Engineering Fracture Mechanics ◽

10.1016/j.engfracmech.2020.107320 ◽

2020 ◽

Vol 240 ◽

pp. 107320 ◽

Cited By ~ 1

Author(s):

Jian-Long Cheng ◽

Zi-Hao Jiang ◽

Wei-Feng Han ◽

Ming-Li Li ◽

Yong-Xing Wang

Keyword(s):

High Pressure ◽

Hard Rock ◽

Water Jet ◽

Disc Cutter ◽

Pressure Water ◽

High Pressure Water Jet ◽

Breakage Mechanism

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

Applied Sciences ◽

10.3390/app10186294 ◽

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.

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Rock Breaking by Conical Pick Assisted with High Pressure Water Jet

Advances in Mechanical Engineering ◽

10.1155/2014/868041 ◽

2014 ◽

Vol 6 ◽

pp. 868041 ◽

Cited By ~ 7

Author(s):

Liu Songyong ◽

Chen Junfeng ◽

Liu Xiaohui

Keyword(s):

Numerical Simulation ◽

High Pressure ◽

Hard Rock ◽

Rock Breaking ◽

Water Jet ◽

Cutting Efficiency ◽

Conical Pick ◽

Pressure Water ◽

High Pressure Water Jet ◽

Better Than

In the process of hard rock breaking, the conical pick bears great cutting force and wear, and the cutting efficiency is lower. Thus different combination ways of water jet and conical pick were proposed to solve this issue; for instance, water jet placed in the front of pick (JFP) and water jet through the center of pick (JCP) was researched by numerical simulation and experiments in this paper. First, the models of rock breaking were built based on SPH combined with finite element method. Then, the stress distribution of rock and the cut force of pick were analyzed when the rock broken by the conical pick assisted with the high pressure water jet. It indicates that the effect of the JCP on rock breaking is better than the JFP. At last, experiments about rock breaking with a conical pick and the JCP were conducted to verify the reliability of the simulation. It indicates that the rock breaking with the assistance of high pressure water jet cannot only reduce the pick force, but also increase the rock crushing volume.

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