长江科学院院报2024，Vol.41Issue(3)：142-147,6.DOI:10.11988/ckyyb.20221363
无粘结环锚预应力衬砌张拉工艺足尺模型试验研究
Full-scale Model Test on Tensioning Technology of Prestressed Lining with Unbonded Circular Anchor
摘要
Abstract
This study focuses on improving stress distribution and preventing crack formation during the tensioning process.To achieve this,we conducted full-scale model test and proposed a tension sequence and quality control in-dexes.Initially,we calculated the friction coefficient based on steel strand friction test.Subsequently,we applied the tension sequence and quality control indexes using an automated tension system.To monitor stress changes,we used elastomagnetic sensors for the steel strand,and strain gauges for the lining concrete.Field tensile tests yield the following key findings:1)The steel strand experiences a prestress loss of approximately 16.3％.However,by utilizing double-layered steel strands,we ensure a highly effective prestress in practical applications.2)Applying the proposed tension sequence in the anchorage slots results in the lining concrete achieving a relatively uniform an-nular compressive stress,with an average compressive stress of-10.9 MPa.3)The three control indexes we recom-mend can be quantitatively managed,and when combined with automated tension technology,they effectively guar-antee the quality of tension.关键词
无粘结环锚/预应力内衬/分级分步张拉/质量控制/足尺模型试验Key words
unbonded circular anchor/prestressed lining/sequential tensioning/quality control/full-scale model test分类
建筑与水利引用本文复制引用
陆岸典,唐欣薇,严振瑞,麦胜文,姚广亮..无粘结环锚预应力衬砌张拉工艺足尺模型试验研究[J].长江科学院院报,2024,41(3):142-147,6.基金项目
广东省重点领域研发计划项目(2019B111108001) （2019B111108001）
珠江三角洲水资源配置工程科研课题(CD88GC0220200034) （CD88GC0220200034）
