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<p>Orthogonal cutting of soft rocks has a myriad of applications in tunneling and excavations. A study has been made here to understand the response of soft rocks to severe plastic deformations over a wide range of strain rates. Experiments were conducted on 4% and 8% artificially reconstituted model soft rocks. PIV analysis of the high-speed, high-resolution images collected allowed a detailed study of the initiation and propagation of regions of localization or fractures. The formation of a major fracture and progressive fragmentation, which occurs periodically, is also discernible in the force signatures. The damage to the material was quantified using the grain size distribution of the cut material. Damage and specific energy reduced by <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\sim \)</EquationSource> <EquationSource Format="MATHML"><math> <mo>∼</mo> </math></EquationSource> </InlineEquation> 25% and <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\sim \)</EquationSource> <EquationSource Format="MATHML"><math> <mo>∼</mo> </math></EquationSource> </InlineEquation> 13%, respectively, with increasing cutting depth by twice, while both only marginally increased when the cutting speeds increased by 4 orders. The force estimations from a brittle tensile model provided the best estimate of force. The study is presented in a framework of applied strain (depth of cut), strain rate (cutting speed) and the damage accrued. The results are especially critical for choosing the cutting parameters in various applications in infrastructure.</p>

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Cutting, Localization and Damage in Soft Rocks

  • 期刊论文

  • 发表日期：

    2026年3月5日

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  • Sudhanshu Rathore,
  • Tejas G. Murthy

摘要

Orthogonal cutting of soft rocks has a myriad of applications in tunneling and excavations. A study has been made here to understand the response of soft rocks to severe plastic deformations over a wide range of strain rates. Experiments were conducted on 4% and 8% artificially reconstituted model soft rocks. PIV analysis of the high-speed, high-resolution images collected allowed a detailed study of the initiation and propagation of regions of localization or fractures. The formation of a major fracture and progressive fragmentation, which occurs periodically, is also discernible in the force signatures. The damage to the material was quantified using the grain size distribution of the cut material. Damage and specific energy reduced by \(\sim \) ∼ 25% and \(\sim \) ∼ 13%, respectively, with increasing cutting depth by twice, while both only marginally increased when the cutting speeds increased by 4 orders. The force estimations from a brittle tensile model provided the best estimate of force. The study is presented in a framework of applied strain (depth of cut), strain rate (cutting speed) and the damage accrued. The results are especially critical for choosing the cutting parameters in various applications in infrastructure.