基于冻结壁地层相变环境下大体积混凝土温度场研究

发布时间：2018-06-02 23:01

  本文选题：大体积混凝土 + 冻结法凿井　； 参考：《应用基础与工程科学学报》2017年02期

【摘要】：介绍了中国矿山冻结法凿井井壁混凝土温度问题的现状和发展,研究了井筒冻结相变导热环境下大体积混凝土井壁温度场数学模型;介绍了营盘壕冻结副立井套内壁的工程概况、垂深704m壁座结构和温度监测方案,7个实测点数据,图形展示了混凝土浇筑72h内井壁及围岩的实测温度发展.有限元数值模型计算获得了对应实测点的温度数据,和实测结果相当接近,并预测了在停止冻结后直至全部融化的井壁及围岩温度分布发展情况.数值计算还原了井壁距内缘深682mm测点2的一段丢失数据,弥补了对测温量程考虑不足导致数据丢失的遗憾,并显示出在混凝土搅拌后37.5h时井壁测点最高温度可达到92.3℃,高温发生在内壁中间部位,井壁内外温差最高达到了65℃以上,如此高的内外温差值得设计和施工人员关注.模型还揭示了停冻120d后冻结壁全部融化,即围岩都上升到摄氏正温以上.
[Abstract]:This paper introduces the present situation and development of the temperature problem of shaft wall concrete in Chinese mine freezing method, and studies the mathematical model of mass concrete wall temperature field under the condition of freezing phase change heat conduction of shaft. This paper introduces the engineering situation of the casing inner wall of freezing auxiliary shaft in Yingpan trench, the structure of vertical 704m wall pedestal and temperature monitoring scheme, the data of 7 measured points, and the actual temperature development of shaft lining and surrounding rock within 72 hours of concrete pouring. The temperature data of the corresponding measured points are obtained by the finite element numerical model, which is quite close to the measured results, and the temperature distribution of the shaft wall and surrounding rock after freezing and melting is predicted. The numerical calculation reduced the missing data of the 682mm measuring point 2 from the inner edge of the shaft wall, made up for the regret of missing the data caused by the insufficient consideration of the temperature measuring range, and showed that the maximum temperature of the shaft wall measuring point could reach 92.3 鈩，

本文编号：1970517