{"title":"Study on Mechanical Properties of Water-Immersed Mudstone Based on Nanoindentation Tests","authors":"Junjie Zheng, Yanqi Song, Fuxin Shen, Zhixin Shao, Chuanpeng Liu, Juntao Yang","doi":"10.1007/s42461-024-01027-w","DOIUrl":null,"url":null,"abstract":"<p>To investigate the alterations in mechanical properties and damage mechanisms of water-immersed mudstone, the mudstone from the weak interlayer of an open-pit coal mine in eastern Inner Mongolia, China, was selected as the research focus. Mudstone samples with water contents of 0, 4.12%, 7.96%, 10.17%, and 12.73% were obtained through non-destructive immersion tests. Meso-mechanical tests on mudstone with different water contents were conducted using nanoindentation technology and scanning electron microscopy. The findings reveal a noticeable weakening of meso-mechanical properties of mudstone after water immersion. The elastic modulus, hardness, and fracture toughness all show a trend of non-linear attenuation with the increase of water content. Water-immersed mudstone exhibits changes characterized by volume expansion, decreased mineral cementation ability, reduced pore size, and increased quantity. The alteration in mudstone’s internal structure directly reflects the physical reasons for the weakening of mechanical properties after water immersion.</p>","PeriodicalId":18588,"journal":{"name":"Mining, Metallurgy & Exploration","volume":"11 1","pages":""},"PeriodicalIF":1.5000,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Mining, Metallurgy & Exploration","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s42461-024-01027-w","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
Abstract
To investigate the alterations in mechanical properties and damage mechanisms of water-immersed mudstone, the mudstone from the weak interlayer of an open-pit coal mine in eastern Inner Mongolia, China, was selected as the research focus. Mudstone samples with water contents of 0, 4.12%, 7.96%, 10.17%, and 12.73% were obtained through non-destructive immersion tests. Meso-mechanical tests on mudstone with different water contents were conducted using nanoindentation technology and scanning electron microscopy. The findings reveal a noticeable weakening of meso-mechanical properties of mudstone after water immersion. The elastic modulus, hardness, and fracture toughness all show a trend of non-linear attenuation with the increase of water content. Water-immersed mudstone exhibits changes characterized by volume expansion, decreased mineral cementation ability, reduced pore size, and increased quantity. The alteration in mudstone’s internal structure directly reflects the physical reasons for the weakening of mechanical properties after water immersion.
期刊介绍:
The aim of this international peer-reviewed journal of the Society for Mining, Metallurgy & Exploration (SME) is to provide a broad-based forum for the exchange of real-world and theoretical knowledge from academia, government and industry that is pertinent to mining, mineral/metallurgical processing, exploration and other fields served by the Society.
The journal publishes high-quality original research publications, in-depth special review articles, reviews of state-of-the-art and innovative technologies and industry methodologies, communications of work of topical and emerging interest, and other works that enhance understanding on both the fundamental and practical levels.