{"title":"统一强度承载环理论中混凝土填充钢管支架的应用","authors":"","doi":"10.1016/j.jcsr.2024.109013","DOIUrl":null,"url":null,"abstract":"<div><p>This paper takes the deep high-stress fractured soft-rock roadway of Jinfeng Gold Deposit as the research object, analyzes the stress state and deformation failure reasons of the roadway via on-site surveys and physical and mechanical test of the surrounding rock, and reveals the main control difficulties of roadway. The axial compression performance tests of circular and square concrete-filled steel tubular (CFST) columns were carried out. A unified strength-bearing ring mechanical model was established, and the bearing ring strengthening composite support mechanism was clarified. The results show that the bearing capacity of circular CFST column is 1.20 to 1.43 times that of square CFST column when the steel content, concrete strength, and wall thickness of the steel tube were identical. When the intermediate principal stress influence coefficient <em>b</em> = 0, the roadway stability criterion of the unified strength-bearing ring and the bearing ring was consistent, indicating the correctness of the unified strength-bearing ring theory. Engineering practice has shown that, based on the support scheme of circular CFST support, the deformation of the two sides and roof decreased by 82.35 % and 73.12 % respectively, effectively controlling the deformation of the roadway surrounding rock, which is an important guiding significance for the roadway support under similar conditions.</p></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":null,"pages":null},"PeriodicalIF":4.0000,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Application of concrete-filled steel tubular support in unified strength-bearing ring theory\",\"authors\":\"\",\"doi\":\"10.1016/j.jcsr.2024.109013\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>This paper takes the deep high-stress fractured soft-rock roadway of Jinfeng Gold Deposit as the research object, analyzes the stress state and deformation failure reasons of the roadway via on-site surveys and physical and mechanical test of the surrounding rock, and reveals the main control difficulties of roadway. The axial compression performance tests of circular and square concrete-filled steel tubular (CFST) columns were carried out. A unified strength-bearing ring mechanical model was established, and the bearing ring strengthening composite support mechanism was clarified. The results show that the bearing capacity of circular CFST column is 1.20 to 1.43 times that of square CFST column when the steel content, concrete strength, and wall thickness of the steel tube were identical. When the intermediate principal stress influence coefficient <em>b</em> = 0, the roadway stability criterion of the unified strength-bearing ring and the bearing ring was consistent, indicating the correctness of the unified strength-bearing ring theory. Engineering practice has shown that, based on the support scheme of circular CFST support, the deformation of the two sides and roof decreased by 82.35 % and 73.12 % respectively, effectively controlling the deformation of the roadway surrounding rock, which is an important guiding significance for the roadway support under similar conditions.</p></div>\",\"PeriodicalId\":15557,\"journal\":{\"name\":\"Journal of Constructional Steel Research\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.0000,\"publicationDate\":\"2024-09-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Constructional Steel Research\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0143974X24005637\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CONSTRUCTION & BUILDING TECHNOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Constructional Steel Research","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0143974X24005637","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
Application of concrete-filled steel tubular support in unified strength-bearing ring theory
This paper takes the deep high-stress fractured soft-rock roadway of Jinfeng Gold Deposit as the research object, analyzes the stress state and deformation failure reasons of the roadway via on-site surveys and physical and mechanical test of the surrounding rock, and reveals the main control difficulties of roadway. The axial compression performance tests of circular and square concrete-filled steel tubular (CFST) columns were carried out. A unified strength-bearing ring mechanical model was established, and the bearing ring strengthening composite support mechanism was clarified. The results show that the bearing capacity of circular CFST column is 1.20 to 1.43 times that of square CFST column when the steel content, concrete strength, and wall thickness of the steel tube were identical. When the intermediate principal stress influence coefficient b = 0, the roadway stability criterion of the unified strength-bearing ring and the bearing ring was consistent, indicating the correctness of the unified strength-bearing ring theory. Engineering practice has shown that, based on the support scheme of circular CFST support, the deformation of the two sides and roof decreased by 82.35 % and 73.12 % respectively, effectively controlling the deformation of the roadway surrounding rock, which is an important guiding significance for the roadway support under similar conditions.
期刊介绍:
The Journal of Constructional Steel Research provides an international forum for the presentation and discussion of the latest developments in structural steel research and their applications. It is aimed not only at researchers but also at those likely to be most affected by research results, i.e. designers and fabricators. Original papers of a high standard dealing with all aspects of steel research including theoretical and experimental research on elements, assemblages, connection and material properties are considered for publication.