关键词: 井壁, 混凝土水化热, 温度场, 监测

Abstract: 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.

Key words: shaft lining, concrete hydration heat, temperature field, monitoring