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Investigation of Fracture Damage and Breaking Energy Consumption of Hard Rock Repeatedly Cut by Abrasive Water Jet

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Abstract

Abrasive water jet is widely used in the field of deep hard rock cutting. To accurately and quantitatively evaluate the implementation effect of repeated cutting hard rock by jet, the ratio of the jet cutting speed to the cutting times is defined as an index to evaluate the rock-breaking effect and efficiency, and laboratory experiments of repeated cutting granite by abrasive water jet under different horizontal stress are carried out. The obtained results show that the increase of rock horizontal stress leads to a rougher cutting surface of the abrasive jet, the average growth rate of roughness is 34.8 and 15.8%, respectively, and increases the specific energy consumption rate of the rock breaking, the average growth rate of specific energy consumption is 11.8 and 38.9%, respectively. When the repeated cutting method is used to break rock, as the ratio of the cutting speed to the cutting times increases, the cutting surface roughness and the specific energy consumption of rock breaking decrease first and then increase. When the cutting speed is 9 mm/s and the cutting is repeated for 3 times, the breaking effect and efficiency are the best. Under the combined action of axial high-speed impact, radial rotary grinding, and water wedge cracking, the local mineral particles in the slot may undergo trans-granular or inter-granular fracture, which eventually evolves into spalling and macro-damage of mineral particles.

Highlights

  • The variation of geometric parameters of slot cut by abrasive water jet with different horizontal stress and repeated cutting times is analyzed.

  • The surface roughness changes after repeated jet cutting were analyzed using three-dimensional morphological scanning.

  • The micro morphological characteristics of the slot surface under repeated cutting by abrasive water jet are described.

  • The results could provide theoretical basis and production guidance for hydraulic cutting and breaking of deep hard rock.

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Data availability

All data generated or analysed during this study are included in this published article.

Abbreviations

\(Z\) :

The vertical elevation of the cutting surface

\(JR\mathrm{C}\) :

The cutting surface roughness

\(L\) :

The cutting length

\({Q}_{w}\) :

The water flow

\({Q}_{a}\) :

The flow of abrasive particles

\({\omega }_{a}\) :

The abrasive mass concentration

\({m}_{t}\) :

The total mass of the abrasive water jet

\({\rho }_{a}\) :

The abrasive density

\(c\) :

The flow coefficient

\(d\) :

The nozzle diameter

\(P\) :

The jet pressure at the nozzle outlet

SE:

The rock-breaking specific energy

\({Q}_{t}\) :

The total jet flow

\({E}_{t}\) :

The total rock-breaking energy

\(T\) :

The cutting time

\(V\) :

The slot volume

\({t}_{s}\) :

The cutting time

\({v}_{a}\) :

The cutting speed under a single cut

\({t}_{m}\) :

The cutting time in the repeatedly cutting process

\({v}_{b}\) :

The cutting speed in the repeatedly cutting process

\({h}_{1a}\) :

The slot depth of the jet when cutting once at a transverse velocity \({v}_{a}\)

\({E}_{1a}\) :

The jet output energy when cutting once at a transverse velocity \({v}_{a}\)

\({h}_{Nb}\) :

The kerf depth when cutting N times at the transverse velocity \({v}_{b}\)

\({E}_{Nb}\) :

The jet output energy when cutting N times at the transverse velocity \({v}_{b}\)

\(\gamma \) :

The specific weight of water

\(Q\) :

The jet flow

\(l\) :

The jet target distance

\({k}_{1}\), \({k}_{N}\), \(\alpha \), \(\beta \), \(n\) :

The coefficients of the abrasive water jet

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Acknowledgements

We acknowledge the financial support from the National Natural Science Foundation of China (No. 52074045, 52274112), and the Project No.2021CDJCGJ010, supported by the Fundamental Research Funds for the Central Universities. Furthermore, our deepest gratitude goes to the anonymous reviewers for their careful work and thoughtful suggestions that have helped improve this paper substantially.

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Authors and Affiliations

  1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, 400044, China

    Zhaolong Ge, Jianming Shangguan, Zhe Zhou, Zhongtan Li, Lei Liu, Changjiang Chen & Chuanfu Shao

  2. School of Resources and Safety Engineering, Chongqing University, Chongqing, 400044, China

    Zhaolong Ge, Jianming Shangguan, Zhe Zhou, Zhongtan Li, Lei Liu, Changjiang Chen & Chuanfu Shao

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  1. Zhaolong Ge
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  2. Jianming Shangguan
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  5. Lei Liu
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Contributions

ZG: Conceptualization, Methodology, Supervision. JS: Conceptualization, Formal analysis, Writing—original draft. ZZ: Validation, Visualization, Investigation. ZL: Resources, Data Curation. LL: Data curation, Reviewing and Editing. CC: Writing—Reviewing and Editing. CS: Writing—Reviewing and Editing.

Corresponding author

Correspondence to Zhe Zhou.

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Ge, Z., Shangguan, J., Zhou, Z. et al. Investigation of Fracture Damage and Breaking Energy Consumption of Hard Rock Repeatedly Cut by Abrasive Water Jet. Rock Mech Rock Eng 56, 3215–3230 (2023). https://doi.org/10.1007/s00603-023-03230-5

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