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      <doi>10.14455/ISEC.2026.13(2).GFE-09</doi>
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        <article-title>NUMERICAL SIMULATION OF PARTICLE ROTATION IN GRANULAR MEDIA DURING GENERAL, LOCAL, AND PUNCHING SHEAR FAILURE</article-title>
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      <author>HOSAM SHEHAB, BARAAH ALRABABA’A, IBRAHIM ALTAROUTI and UMAIR ALI</author>
      <aff>Civil and Environmental Engineering Dept, King Fahd Univ of Petroleum and Minerals, Dhahran, Saudi Arabia<br /></aff>
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      <title>ABSTRACT</title>
      <p>Particle rotation has an important influence in the mechanical response of granular materials and is closely linked to how deformation and failure develop under loading.  This study investigates the behavior of particle rotation in granular media subjected to general shear, local shear, and punching shear using the Discrete Element Method (DEM) in Particle Flow Code (PFC) 2D.  The analysis focuses on particle rotation, stress components (σxx and σyy), and displacement patterns to examine how these variables evolve under different failure conditions.  The numerical results show that each shear mode is associated with a distinct pattern of deformation and stress transfer.  In general shear, deformation is distributed over a broader zone, and stress is dissipated more gradually.  Local shear is characterized by strain concentration within narrower shear bands, while punching shear produces the most localized response, with intense particle rotation and stress concentration directly beneath the applied load.  These differences reveal the strong relationship between particle-scale motion and the macroscopic failure behavior of granular assemblies, especially those involving foundations and soil-structure interaction.</p>
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        <italic>Keywords: </italic>DEM simulation, PFC, Stress distribution, Shear band</p>
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      <hpdf>GFE-09</hpdf>
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