水力发电学报2016，Vol.35Issue(10)：103-111,9.DOI:10.11660/slfdxb.20161011
固结灌浆期间盖重抬动对混凝土应力的影响研究
Effects of cover-weight lift on concrete stress during consolidation grouting
摘要
Abstract
To study cracking in concrete during consolidation grouting,this paper reports three-dimensional finite element simulations of the cover weight lift in the process of consolidation grouting for the cases of applying different grouting pressures or different lifting displacements of the cover weight,along with a case study of the dam section No.11 of the Huangdeng hydropower station.Focusing on concrete surface cracks,we have examined pouring process and stress field in 12 cases of different grouting pressures,lifting displacements and temperature loads,using practical conditions of concrete grouting,temperature control,and data collection practically implemented in the construction of this dam section.The simulation results show that a limited grouting pressure generally causes no significant increase in the tensile stress of concrete,but its tensile safety factor could become quite low if the grouting pressure applied is low enough in the condition of considerable temperature stress.A certain amount of cover weight displacement will cause large tensile stress near concrete surface,and the superposition of temperature loads on the displacement effect often results in higher risks of concrete cracking.关键词
固结灌浆/盖重抬动/表面裂缝/开裂机理Key words
consolidation grouting/cover weight lift/surface cracks/cracking mechanism分类
建筑与水利引用本文复制引用
徐江宇,常晓林,周伟,张超,郭华伟..固结灌浆期间盖重抬动对混凝土应力的影响研究[J].水力发电学报,2016,35(10):103-111,9.基金项目
国家重点基础研究发展计划项目(973计划)(2013CB035901) （973计划）
国家自然科学基金(51579192) （51579192）
