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<p>To explore the influence of high-temperature heat treatment on rock cuttability with distinct lithologies, the physical and mechanical properties were measured for ten types of rocks with different lithologies. The mechanical properties of the rocks were tested through uniaxial compression test, Brazilian splitting test, Vickers hardness test, and Cerchar abrasivity index test. Subsequently, the rock indentation test was conducted using a conical pick. The test results revealed that, after applying high-temperature heat treatment with varying temperature gradients to the rocks, the physical and mechanical properties of rocks with different lithologies changed significantly. The impact of high-temperature heat treatment on rock cuttability manifested in three trends: increase followed by decrease (type I), continuous decrease (type II) and decrease followed by increase (type III). The results further indicated that there were diverse temperature thresholds for the effect of high-temperature heat treatment on the physical and mechanical properties of rocks with different lithologies. For sedimentary rocks (such as red sandstone and mudstone), high-temperature heat treatment mainly induced mineral thermal reactions and thermal cementation. Mineral thermal reactions would reduce the strength of rocks, while thermal cementation would lead to an increase in the rocks' strength. For magmatic rocks (such as granite), high temperature caused mineral thermal reactions and the development of microscopic cracks, ultimately resulting in a reduction in rock strength. Meanwhile, based on the test results, two-dimensional regression models were established to analyze the relationship between rock cuttability parameters and rock mechanical properties. These finally validated that high-temperature heat treatment affected rock strength and, in turn, affected rock cuttability. It can be found that high-temperature heat treatment can be applied to improve the cuttability of rock mass with low cuttability and high heat thermal reaction before rock breaking using a mechanical cutter.</p>

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Rock Cuttability Using Conical Pick Indentation and Rock Property Variations: Effects of High-temperature Heat Treatment and Implications for Mining

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Shaofeng Wang,
  • Changyuan Wei,
  • Zilong Zhou,
  • Shanyong Wang

摘要

To explore the influence of high-temperature heat treatment on rock cuttability with distinct lithologies, the physical and mechanical properties were measured for ten types of rocks with different lithologies. The mechanical properties of the rocks were tested through uniaxial compression test, Brazilian splitting test, Vickers hardness test, and Cerchar abrasivity index test. Subsequently, the rock indentation test was conducted using a conical pick. The test results revealed that, after applying high-temperature heat treatment with varying temperature gradients to the rocks, the physical and mechanical properties of rocks with different lithologies changed significantly. The impact of high-temperature heat treatment on rock cuttability manifested in three trends: increase followed by decrease (type I), continuous decrease (type II) and decrease followed by increase (type III). The results further indicated that there were diverse temperature thresholds for the effect of high-temperature heat treatment on the physical and mechanical properties of rocks with different lithologies. For sedimentary rocks (such as red sandstone and mudstone), high-temperature heat treatment mainly induced mineral thermal reactions and thermal cementation. Mineral thermal reactions would reduce the strength of rocks, while thermal cementation would lead to an increase in the rocks' strength. For magmatic rocks (such as granite), high temperature caused mineral thermal reactions and the development of microscopic cracks, ultimately resulting in a reduction in rock strength. Meanwhile, based on the test results, two-dimensional regression models were established to analyze the relationship between rock cuttability parameters and rock mechanical properties. These finally validated that high-temperature heat treatment affected rock strength and, in turn, affected rock cuttability. It can be found that high-temperature heat treatment can be applied to improve the cuttability of rock mass with low cuttability and high heat thermal reaction before rock breaking using a mechanical cutter.