混凝土水化热对白垩系地层冻结壁温度场影响的实测分析

Site Measurement Analysis on Concrete Hydration Heat Affected to Temperature Field of Freezing Wall in Cretaceous Stratum

为了了解外井壁混凝土水化热对白垩系地层冻结壁温度场的影响规律,通过对新庄煤矿回风立井冻结壁的两个地层进行温度的现场监测,分析监测数据得到：外井壁混凝土浇筑后,两个地层的冻结壁内侧温度迅速升高,监测点处的温度最高点达到15.8℃;随着深度的增加,混凝土水化热对冻结壁的影响范围增大,但冻结壁维持正温的时间减少;在混凝土水化热的作用下,冻结壁的融化深度介于250~600mm之间;水化热的减少及融化区的水热在温度梯度的作用下大量向冻结区迁移,致使冻结壁内侧高温部分的温度迅速下降。

In order to understand an influence law of the concrete hydration heat from the mine shaft outer liner to the temperature field of the freezing wall in a Cretaceous stratum, a site temperature monitoring and measuring was conducted in two strata of the freezing wall of a mine air returning shaft in Xinzhuang Mine. The analysis on the monitoring and measuring data showed that after the outer liner concrete poured in place, inner temperatures of the freezing wall at the two strata were rapidly increased and a max temperature at the monitoring and measuring point was reached to 15.8~C. With the depth increased, the influence scope of the concrete hydration heat to freezing wall was increased and a time of the freezing wall to keep the normal temperature was reduced. Under the role of the concrete hydration heat, a thawing depth of the freezing wall would be ranging from 250 ~ 600mm. the hydration heat reduced and the water heat in the thawing zone would be greatly migrated to the freezing zone under a role of temperature gradient and thus the temperature of the high temperature section at the inner freezing wall would rapidly reduced.