{"title":"Experimental Study on Pull-Out Behavior of Wedge-Grouted Rockbolt in Wind Turbine Tower Foundation","authors":"Haiyang Gao, Lianguang Wang, Xue Li, Yaosheng Zhang","doi":"10.1007/s13296-023-00793-5","DOIUrl":null,"url":null,"abstract":"<p>To investigate the the pull-out behaviors of wedge-grouted rockbolts and grouted rockbolts in strongly weathered and moderately weathered rocks, the rockbolts with lengths of 8.0 m, 10.5 m and 13.0 m were tested under freeze–thaw cycle and cyclic load. The test result shows that the minimum anchoring length of wedge-grouted rockbolt is less than 3.0 m and of grouted rockbolt is less than 4.0 m in the strongly weathered or moderately weathered rock. The effect of the wedge head on restricting the deformation of the rockbolt is not obvious when the anchoring length is less than 6.0 m. Freeze–thaw cycle had little effect on the stiffness and deformation of the two kinds of rockbolts. The wedge-grouted rockbolts have better deformation performance than the grouted rockbolts. The bonding force between the rockbolt and the grout or the grout and the surrounding rock is greater than the tensile strength of the rockbolt. Furthermore, the calculation models of shear stress and axial strain can provide reasonable predictions for two kinds of rockbolts, and the development trends of strain and shear stress under different pullout loads were calculated.</p>","PeriodicalId":596,"journal":{"name":"International Journal of Steel Structures","volume":null,"pages":null},"PeriodicalIF":1.1000,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Steel Structures","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s13296-023-00793-5","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
To investigate the the pull-out behaviors of wedge-grouted rockbolts and grouted rockbolts in strongly weathered and moderately weathered rocks, the rockbolts with lengths of 8.0 m, 10.5 m and 13.0 m were tested under freeze–thaw cycle and cyclic load. The test result shows that the minimum anchoring length of wedge-grouted rockbolt is less than 3.0 m and of grouted rockbolt is less than 4.0 m in the strongly weathered or moderately weathered rock. The effect of the wedge head on restricting the deformation of the rockbolt is not obvious when the anchoring length is less than 6.0 m. Freeze–thaw cycle had little effect on the stiffness and deformation of the two kinds of rockbolts. The wedge-grouted rockbolts have better deformation performance than the grouted rockbolts. The bonding force between the rockbolt and the grout or the grout and the surrounding rock is greater than the tensile strength of the rockbolt. Furthermore, the calculation models of shear stress and axial strain can provide reasonable predictions for two kinds of rockbolts, and the development trends of strain and shear stress under different pullout loads were calculated.
期刊介绍：
The International Journal of Steel Structures provides an international forum for a broad classification of technical papers in steel structural research and its applications. The journal aims to reach not only researchers, but also practicing engineers. Coverage encompasses such topics as stability, fatigue, non-linear behavior, dynamics, reliability, fire, design codes, computer-aided analysis and design, optimization, expert systems, connections, fabrications, maintenance, bridges, off-shore structures, jetties, stadiums, transmission towers, marine vessels, storage tanks, pressure vessels, aerospace, and pipelines and more.
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