倒虹吸管身冬季施工温控仿真分析及应用实例  

Simulation and application on concrete temperature control measures for inverted siphons in winter

作　　者：郭磊[1] 汪伦焰[1] 许庆伟[2] 

机构地区：[1]华北水利水电学院水利学院,郑州450045 [2]黄河建工集团有限公司,郑州450052

出　　处：《农业工程学报》2010年第7期175-180,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金资助项目(50579080)

摘　　要：倒虹吸管是输水引水及灌溉工程中的一种重要交叉建筑物。针对管身混凝土结构施工期易开裂问题,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。结合混凝土温度场应力场的基本原理的精确算法,通过三维有限单元法对施工期沁河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。首次在南水北调中线工程焦作市段采用了模板外面贴高压聚乙烯苯板的保温方法,计算结果表明,混凝土的允许抗拉强度能达到1.6的安全系数,因而得到成功的防裂效果,值得类似工程应用推广。Inverted siphon is an important cross-building project for water diversion and irrigation.In view of the problem of mass concrete cracks during construction,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 basic theories of temperature field and stress field of concrete,the 3-D FEM is adopted to simulate the stresses field of Qinhe river Inverted siphon during construction.Through analyzing the time-space variation law,it is found that cracks easily appear.In the middle section of the South to North Water Transfer Project,for the first time,the quality of concrete has been improved obviously through the method of external insulation board.The results show that the safety coefficient of tensile strength of concrete can be greater than 1.6,so it deserves to be popularized for other engineering applications.

关 键 词：倒虹吸 温控防裂 温度场 仿真计算 

分 类 号：TV521[水利工程—水利水电工程] TV672.5