Title: Prediction of the specific energy requirement of hydraulic rock breaker based on laboratory impact hammer - a case study

Authors: Samir Kumar Pal; Akhil Avchar; Abhishek Vyas; Anup Kumar Tripathi

Addresses: Department of Mining Engineering, Indian Institute of Technology Kharagpur, West Bengal 721302, India ' Department of Mining Engineering, National Institute of Technology (NITK), NH 66, Srinivasnagar, Surathkal, Mangalore, Karnataka – 575 025, India ' Mining Engineering Department, Sangam University, Bhilwara, Rajasthan, India ' Department of Mining Engineering, National Institute of Technology (NITK), NH 66, Srinivasnagar, Surathkal, Mangalore, Karnataka – 575 025, India

Abstract: The present study was conducted in a limestone mine at central Rajasthan, India for correlating the impact energy of hydraulic rock breaker with laboratory size gravitational impact rock breaker. Data generation and results were obtained mainly to correlate the specific impact energy required by the hydraulic rock breaker field (IEF) in kJ/m³ for breaking boulders in the field versus the specific impact energy required by the gravitational impact rock breaker laboratory (IEL) in kJ/m³. Laboratory investigation values for Schmidt rebound number (RN) is between 27 to 44; UCS (σ_c) between 96.27 to 132.25 MPa; tensile strength (σ_t) between 9.14 to 14.66 MPa; and point load strength (I_s50) between 8.95 to 12.65 MPa. In the present research, an attempt is made to study impact energy utilised by hydraulic rock breaker in the field and comparison of specific energy requirements based on a laboratory-size impact hammer.

Keywords: limestone mines; oversize boulders; hydraulic rock breaker; specific impact energy; geotechnical properties; prediction.

DOI: 10.1504/IJMME.2024.140075

International Journal of Mining and Mineral Engineering, 2024 Vol.15 No.2, pp.237 - 259

Received: 13 Dec 2022
Accepted: 18 Dec 2023
Published online: 19 Jul 2024 *

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