大体积高性能混凝土冻结井壁水化热温度场实测与分析  

Monitoring and analysis of hydration heat temperature field for high performance mass concrete freezing shaft lining

作　　者：张涛[1,2] 杨维好[1,2] 陈国华 黄家会[2] 韩涛[2] 张驰[1] 

机构地区：[1]中国矿业大学深部岩土力学与工程国家重点实验室,江苏徐州221116 [2]中国矿业大学力学与建筑工程学院,江苏徐州221116 [3]乌审旗蒙大矿业有限责任公司,内蒙古乌审旗017317

出　　处：《采矿与安全工程学报》2016年第2期290-296,共7页Journal of Mining & Safety Engineering

基　　金：国家高技术研究发展计划(863)项目(2012AA06A401);国家自然科学基金项目(51174194;51323004)

摘　　要：大体积高性能混凝土井壁水化热温度场发展规律对于研究井筒温度应力、提高井壁质量极为重要,为获得实测资料,对国内井筒直径和井壁厚度均最大的冻结井壁开展了早龄期温度场实测研究与分析。设置4个监测层位,实时监测获得了一次浇注厚度达2.5 m的C60高性能混凝土井壁温度场的分布规律及井壁内径向各点的温升规律,获得不同厚度和标号井壁的最高温度达61.4~73.1℃、最大温升39.6~48.8℃、内部最大温差24.3~33.0℃。拟合得到了较符合现场浇注井壁内最高温升与龄期的双指数关系式。并结合工程实践,从混凝土材料、水化热温升、降低约束和养护条件等方面分析了大体积混凝土井壁预防开裂的技术措施。实测数据为冻结井壁设计与施工提供宝贵的基础资料,为工程建设提供借鉴。The development law of hydration heat temperature field for high performance mass concrete freezing shaft lining is very important for the study on shaft temperature stress and key to improve the quality of shaft wall lining. In order to obtain the measured data, the early age temperature field of freezing shaft lining concrete, which has the largest shaft diameter and thickness in the domestic, has been monitored and analyzed. 4 monitoring layers have been set up. Through the real-time monitoring, the research has obtained the temperature field distribution rules and radial temperature rise laws, for high performance concrete freezing shaft lining whose strength up to C60 and thickness to 2.5 m by one-time pouring. For different strength and thickness of shaft, the maximum temperature has reached 61.4-73.1 ℃, and the maximum temperature rise has reached 39.6-48.8 ℃, and the maximum internal temperature difference has run up to 24.3-33.0 ℃. Double exponential relation has been obtained, which fits the maximum temperature rise and age of cast-in-place concrete shaft. Combined with the engineering practice. Besides, the technical measures taken to prevent the crack of mass concrete shaft from aspects of concrete materials, temperature rise of hydration heat, constraints reduction and curing conditions. The measured data have provided valuable basic information for the design and construction of freeze shaft, and provided reference for construction of mining.

关 键 词：井壁 混凝土水化热 温度场 监测 

分 类 号：TD265[矿业工程—矿井建设]