This paper attempts to disclose the distribution law of artificial freezing temperature field in Cretaceous sandstone of western China and determine the key parameters of freeze sinking. For this purpose, a numerical model was established in light of the general conditions of freeze sinking project, the model parameters were optimized according to onsite monitored data, and the optimized model was applied to explore the change law of the freezing temperature field. The simulation reveals that the temperature of each measuring point decreased linearly with time, but the mean daily decline differed from point to point: the daily decline is negatively correlated to the distance from the freezing point, i.e. the temperature is positively correlated to the distance from the freezing point at the same time. The freezing time for closure was 79d at the groundwater flow rate of 50m/d. When the freezing intensity was weak (freezing tube temperature: -22℃), the frozen wall failed to achieve closure. This means the groundwater directly bears on the distribution of the temperature field. The freezing intensity has a nonlinear impact on the temperature field. The higher the temperature, the smaller the impact on the closure.
artificial freezing, temperature field, seepage, closur
This paper is made possible thanks to the generous support from National Natural Science Foundation of China (Grant No.: 51404193), General Project of China Postdoctoral Fund (Grant No.: 2015M572581), and Youth Talent Project of Shaanxi Provincial Natural Science Foundation (Grant No.: S2015YFJQ1194).
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