{"title":"优化地下露天止水带周围应力松弛区的冠状柱厚度","authors":"Vishal Babu Guggari, Gnananandh Budi","doi":"10.1007/s42461-024-01058-3","DOIUrl":null,"url":null,"abstract":"<p>The excavation of steeply dipping ore deposits using sub-level mining techniques with delayed backfill can cause stress relaxation and concentration in the stope hanging wall and footwall at deeper depths. Designing adequate crown pillars that can withstand significant horizontal stress and prevent the collapse of the hanging wall and footwall is crucial for ensuring safe mining operations. This study developed a methodology for predicting the appropriate crown pillar thickness for depths between 510 and 1000 m based on 240 non-linear numerical models with Mohr–coulomb elastoplastic failure criteria under plane strain conditions with five parameters affecting crown pillar stability. A precise and reliable empirical equation has been devised to compute the safety factor (<i>SF</i>) of the crown pillar. The equation has a high predictive capability with an <i>R</i><sup>2</sup> value of 0.85. Design charts were developed for various geo-mining conditions and working depths to estimate the optimal crown pillar thickness.</p>","PeriodicalId":18588,"journal":{"name":"Mining, Metallurgy & Exploration","volume":"65 1","pages":""},"PeriodicalIF":1.5000,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Optimization of Crown Pillar Thickness in the Stress Relaxation Zone Surrounding Sub-Level Open Stopes\",\"authors\":\"Vishal Babu Guggari, Gnananandh Budi\",\"doi\":\"10.1007/s42461-024-01058-3\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The excavation of steeply dipping ore deposits using sub-level mining techniques with delayed backfill can cause stress relaxation and concentration in the stope hanging wall and footwall at deeper depths. Designing adequate crown pillars that can withstand significant horizontal stress and prevent the collapse of the hanging wall and footwall is crucial for ensuring safe mining operations. This study developed a methodology for predicting the appropriate crown pillar thickness for depths between 510 and 1000 m based on 240 non-linear numerical models with Mohr–coulomb elastoplastic failure criteria under plane strain conditions with five parameters affecting crown pillar stability. A precise and reliable empirical equation has been devised to compute the safety factor (<i>SF</i>) of the crown pillar. The equation has a high predictive capability with an <i>R</i><sup>2</sup> value of 0.85. Design charts were developed for various geo-mining conditions and working depths to estimate the optimal crown pillar thickness.</p>\",\"PeriodicalId\":18588,\"journal\":{\"name\":\"Mining, Metallurgy & Exploration\",\"volume\":\"65 1\",\"pages\":\"\"},\"PeriodicalIF\":1.5000,\"publicationDate\":\"2024-08-14\",\"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/s42461-024-01058-3\",\"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}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Mining, Metallurgy & Exploration","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s42461-024-01058-3","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}
Optimization of Crown Pillar Thickness in the Stress Relaxation Zone Surrounding Sub-Level Open Stopes
The excavation of steeply dipping ore deposits using sub-level mining techniques with delayed backfill can cause stress relaxation and concentration in the stope hanging wall and footwall at deeper depths. Designing adequate crown pillars that can withstand significant horizontal stress and prevent the collapse of the hanging wall and footwall is crucial for ensuring safe mining operations. This study developed a methodology for predicting the appropriate crown pillar thickness for depths between 510 and 1000 m based on 240 non-linear numerical models with Mohr–coulomb elastoplastic failure criteria under plane strain conditions with five parameters affecting crown pillar stability. A precise and reliable empirical equation has been devised to compute the safety factor (SF) of the crown pillar. The equation has a high predictive capability with an R2 value of 0.85. Design charts were developed for various geo-mining conditions and working depths to estimate the optimal crown pillar thickness.
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.