MgO微膨胀混凝土的温降补偿在三江拱坝的研究和应用  

Application and study of MgO micro-expanding concrete for construction of Sanjiang Arch Dam

作　　者：张国新[1] 杨为中 罗恒 杨波[1] 

机构地区：[1]中国水利水电科学研究院结构材料所,北京100038 [2]贵州省水利水电设计研究院,贵州贵阳550002

出　　处：《水利水电技术》2006年第8期20-23,共4页Water Resources and Hydropower Engineering

基　　金：自然科学重点基金项目(E50539010);水利部"948"计划:技术创新与转化项目(CT200513)

摘　　要：三江拱坝是以外掺MgO加2条诱导缝的方式,利用一个低温季节建成的第一座拱坝。MgO的膨胀性补偿了混凝土的部分收缩,2条诱导缝张开后释放了多余的温度应力。现已经过一个严冬的考验并已蓄水运行,至今未发现裂缝。实践证明,外掺MgO加少量分缝的方式既简化了施工、节省了投资、加快了施工速度,又保证大坝不出现裂缝。文中介绍该坝的应力仿真分析、MgO掺量和分缝方式的选择过程和研究结果。Sanjiang Arch Dam is the first arch dam constructed by MgO micro-expanding concrete with two inducing joints during cold season. In this way, a part of thermal shrink of the concrete is compensated by the expandability of the MgO and the additional thermal stress is released by openings of two inducing joints. After the operation with empty reservoir through a cold winter and the impounding operation at present, no cracks have been observed. The practice shows that the construction mode of using MgO concrete with few construction joints can not only simplify the construction, save investment and speed up the construction, but also can ensure that no cracks will occur on the dam body. The stress simulation analysis, design of MgO content and the selection of layout of the inducing joints on SanJiang Arch Dam are described herein.

关 键 词：MGO 微膨胀混凝土 应力仿真分析 三江拱坝 

分 类 号：TV544.91[水利工程—水利水电工程] TV431.9