Title: A review study of thermal conductivity and influencing physico-mechanical properties of rocks

Authors: G. Dileep; A.K. Tripathi; Ch. S.N. Murthy; S.K. Pal

Addresses: Department of Mining Engineering, National Institute of Technology Karnataka, Surathkal, 575025, Karnataka, India ' Department of Mining Engineering, Faculty of Mining Engineering, National Institute of Technology Karnataka, Surathkal, 575025, Karnataka, India ' Department of Mining Engineering, Faculty of Mining Engineering (Retd.), National Institute of Technology Karnataka, Surathkal, 575025, Karnataka, India ' Department of Mining Engineering, Faculty of Mining Engineering (Retd.), Indian Institute of Technology Kharagpur, Kharagpur, 721302, West Bengal, India

Abstract: Geothermal exploration and heat flow studies rely heavily on rock's thermal conductivity, and it controls the subsurface temperature distribution. A broad study of rock thermal properties has become progressively indispensable for geotechnical, civil, mining, and tunnel engineers. The thermal properties of rocks are essential to the ground modification technique of geothermal heat pumps, environmentally conscious projects like dumping high-level nuclear waste in underground sites, and a wide range of engineering projects. The steady-state technique is commonly employed for homogeneous materials, providing a more precise thermal conductivity value despite longer testing times. Conversely, the transient technique is preferred for heterogeneous materials with moisture content, considering this factor but requiring multiple tests to achieve accurate results. This paper explores the predominant approaches used to measure rock thermal conductivity and identify the factors that influence it. Additionally, researchers present a generic equation for predicting the thermal conductivity of rocks using data they have gathered. According to this article, the thermal conductivity of rocks is influenced by several factors such as porosity, density, pressure, moisture content, variations in mineral composition, temperature, and more.

Keywords: thermal conductivity; rock; heat transfer; porosity; density; temperature.

DOI: 10.1504/IJMME.2023.137299

International Journal of Mining and Mineral Engineering, 2023 Vol.14 No.3, pp.247 - 273

Received: 06 Apr 2023
Accepted: 30 Aug 2023
Published online: 11 Mar 2024 *

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