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为了得到深厚表土多圈管冻结温度场的演变规律,考虑压力对土体结冰温度的影响,研制了深厚表土冻结壁温度场试验系统.依据相似理论,以赵楼风井井筒冻结工程为原型,进行加载后的多圈管冻结温度场试验研究。结果表明:3圈冻结管冻结锋面交圈时间为50 d,冻结壁厚11.2 m,冻结壁平均温度-22.8℃,拟合得到冻结壁平均温度随时间变化函数T1=-3×10-93τ+2×10-52τ-0.0358τ+2.932,井帮温度随时间变化函数T2=-0.0207τ+10.32.特征面温度场进入拟稳定阶段后,冻结壁厚度基本稳定,冻结壁平均温度、井帮温度满足井筒开挖要求;特征面温度场进入稳定阶段后,冻结管冷负荷主要用于维护冻结壁向内扩展区和向外扩展区的温度.
In order to obtain the evolvement regularity of freezing temperature field of multi-ring tube with deep surface soil and to consider the influence of pressure on freezing temperature of soil, a temperature field test system of deep frozen soil wall was developed. According to the similarity theory, , After loading the multi-ring tube freezing temperature field test study. The results show that the freezing time of the freezing tube is 50 d, the freezing wall thickness is 11.2 m, and the average temperature of the freezing wall is -22.8 ℃. The fitting function of the average temperature of the freezing wall with time T1 = -3 × 10-93τ + 2 × 10-52τ-0.0358τ +2.932, the function of wellbore temperature with time T2 = -0.0207τ + 10.32. After entering the quasi-stable stage, the frozen wall thickness is basically stable, and the average temperature of frozen wall, well temperature To meet the requirements of wellbore excavation; after the temperature field of the characteristic surface enters a stable stage, the cooling load of the freezing pipe is mainly used for maintaining the temperature of the inward expansion zone and the outward expansion zone of the freezing wall.