漕河落地矩形渡槽施工期温度实时仿真

渡槽防裂标准非常严格,尤其是对南水北调中线工程这样的长距离、大流量的输水建筑物,其限裂标准要求很严,必须严格保证,而施工早期的裂缝将影响渡槽的安全运行,日气温的变化对渡槽这样的薄壁结构施工期温度场的分布有着非常大的影响.利用有限元程序对南水北调中线京石段应急供水工程漕河渡槽段落地矩形渡槽的施工过程进行仿真模拟,计算施工期温度场,将计算结果与实测温度进行比对.结果表明,通过仿真计算可以真实地模拟施工期温度场,对指导施工和选择施工方案有重要意义,同时还可以推广到类似的工程.实测和计算结果还表明,最大温差小于规范要求,漕河渡槽在施工期不会出现危害性裂缝.

Real-time temperature simulation of Caohe River landing rectangular aqueduct for Project during construction period

The cracking control standard of water delivery structure is quite strict especially for middle-route of South-to-North Water Transfer Project with long distance water transfer,large discharge;the crack prevention standard is extraordinary strict and must be reached.Early crack during construction period will affect safe operation of aqueduct;and diurnal variation of air temperature has significant effect on temperature field of thin-walled structure.Construction process simulation and temperature field calculation during construction period about Caohe River landing rectangular aqueduct of Beijing-Shijiazhuang emergency water supply engineering of middle-route of South-to-North Water Transfer Project are carried out by FEM code;then the calculation result and monitoring value are compared.The comparison result shows that the temperature field during construction can be accurately simulated by simulation calculation;it is helpful for guiding construction and choosing construction scheme,and worthy to popularize to other similar projects.From the calculation and monitoring,the maximum temperature difference is less than the standard;so there will be no serious cracks during construction in Caohe River aqueduct;and construction schemes and temperature control measures are available.