摘要
管身混凝土结构在冬季施工期易发生裂缝,认为结构的内外温差、基础温差是这类裂缝产生的主要原因。通过三维有限单元法对施工期倒虹吸进行仿真计算,分析混凝土施工期应力场的时空变化规律,得出管身裂缝容易出现的部位。在南水北调中线工程勒马河倒虹吸冬季施工中采用了模板外面贴聚乙烯苯板(泡沫保温板),仿真表明,优化后保温措施对混凝土防裂有很好的效果,值得类似工程应用推广。
In view of the problem of mass concrete cracks during construction in winter,the corresponding measures and methods are put forward.Generally speaking,the difference between the internal and external temperature and the basic difference of temperature are considered as the main factors influencing the phenomena.Under the 3-D FEM is adopted to simulate the stresses field of Inverted siphon during construction in winter.Through analyzing the time-space variation law,it is fund that cracks easily appear.In the part of the middle line of the South-North Water Transfer Project,the quality of concrete surface of The Lemahe Inverted Siphon Project has been improved obviously through the method of external insulation board,so it deserves to be popularized.
出处
《混凝土》
CAS
CSCD
北大核心
2010年第12期111-113,共3页
Concrete
关键词
冬季
温控
防裂
温度场
仿真
winter
temperature control
cracks prevention
temperature field
simulation
作者简介
作者简介：杨俊成（1972-），男，高级工程师，专业水工结构。单位地址：湖北省宜昌市葛洲坝集团基础工程有限公司（443002）联系电话：15039116967
