An experimental and numerical investigation on dynamic mechanical behavior and fracture characteristics of sandstone under active confining pressures

An experimental and numerical investigation on dynamic mechanical behavior and fracture characteristics of sandstone under active confining pressures | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article An experimental and numerical investigation on dynamic mechanical behavior and fracture characteristics of sandstone under active confining pressures Sheng-Qi Yang, Ye Li, Wen-Ling Tian, Bo-Wen Sun, Zhen zhong, Xiao-Shuang Li This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5763124/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 12 Jun, 2025 Read the published version in Geomechanics and Geophysics for Geo-Energy and Geo-Resources → Version 1 posted 10 You are reading this latest preprint version Abstract This study aims to investigate the dynamic mechanical properties and failure mechanisms of red sandstone under varying strain rates and confining pressures, using a modified confining pressure split Hopkinson pressure bar (SHPB) system, focus on investigating the mechanical behavior, stress-strain response, energy dissipation mechanisms, and ultimate failure modes of red sandstone specimens subjected to varying strain rates and confining pressures. The findings reveal that red sandstone exhibited significant plastic yielding, with strain rate effects enhancing its ductility and peak strain. As strain rate and confining pressure increased, parameters for instance elastic modulus, compressive strength, and strain rate strengthening also elevated. Confining pressure constrained deformation, resulting in a decrease in strain rate as confining pressure increased, while maintaining a constant impact velocity. Reflection energy exhibited a positive correlation with strain rate but remained unaffected by confining pressure, suggesting that it was solely influenced by the strain rate. Dissipated energy demonstrated a clear dependence on both confining pressure and strain rate, with an increase observed for both factors. Furthermore, a positive correlation was established between dissipated energy and dynamic compressive strength. Additionally, the failure mode of red sandstone was found to be predominantly shear failure, characterized by core-retaining cones and large fragments, with fragmentation following a fractal distribution law. The fractal dimension of the fragments ranged from 2.20 to 2.80 under active confining pressure. Dynamic rock mechanics Active confining pressures SHPB SPH-FEM coupling simulation Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 12 Jun, 2025 Read the published version in Geomechanics and Geophysics for Geo-Energy and Geo-Resources → Version 1 posted Editorial decision: Accepted 18 May, 2025 Reviews received at journal 05 May, 2025 Reviews received at journal 03 May, 2025 Reviewers agreed at journal 29 Apr, 2025 Reviews received at journal 28 Apr, 2025 Reviewers agreed at journal 28 Apr, 2025 Reviewers agreed at journal 27 Apr, 2025 Reviewers invited by journal 27 Apr, 2025 Submission checks completed at journal 15 Apr, 2025 First submitted to journal 06 Apr, 2025 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-5763124","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":448833458,"identity":"1e763eca-ae89-4d3b-9690-8a0cca6fb822","order_by":0,"name":"Sheng-Qi Yang","email":"","orcid":"","institution":"Shaoxing University","correspondingAuthor":false,"prefix":"","firstName":"Sheng-Qi","middleName":"","lastName":"Yang","suffix":""},{"id":448833459,"identity":"c1b71447-e387-40a9-b9ce-9a4de66955d9","order_by":1,"name":"Ye 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