关键词: 温度, 水化热, 冻结壁, 外壁, 监测

Abstract: In the process of coal mine shaft freezing sinking construction in Cretaceous strata, through analyzing the monitored data of two representative horizontal layers, the basic law of the temperature variations of the outer wall and the freezing wall has been obtained. Research shows that the temperature increases rapidly after the outer walls have been poured; the temperature of the two horizontal layer rises up to 68.4 ℃ in 1.5 d, and the coarse sandstone’s temperature rising rate of hydration heat effect is faster than that of fine grained sandstone. Amount of hydration heat makes the positive temperature maintenance of the two monitoring levels longer, which can benefit concrete strength at its early growth of the out wall concrete. Meanwhile, the heat causes the frozen wall wide-range temperature rise and partial melting (melting depth reaching 305 mm), which causes negative impact on the strength of frozen wall. The analysis and investigation of the hydrated heat of concrete effection has instructive significance to shaft freezing design and construction in Cretaceous strata.

Key words: temperature, heat of hydration, frozen wall, the outer wall, monitoring