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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 the influence law of outer wall concrete hydration heat on the temperature field of the frozen wall in the Cretaceous strata, by monitoring the temperature of two strata in the frozen wall of the return air shaft of Xinzhuang Coal Mine, the monitoring data are obtained as follows: After that, the temperature inside the frozen wall of both strata rapidly increased, and the highest temperature at the monitoring point reached 15.8 ℃. With the increase of depth, the influence of concrete hydration heat on the frozen wall increased, but the freezing wall maintained a positive temperature Of the time; under the action of hydration heat of concrete, the thawing depth of the frozen wall is between 250 and 600 mm; the reduction of hydration heat and the water-heat in the melting zone are largely migrated to the freezing zone under the action of the temperature gradient, The temperature inside the frozen wall inside the rapid decline in the temperature.