Research on layout optimization of freezing pipes based on numerical calculation of hydro-thermal model

In order to study the influence of seepage flow on the development of frozen curtain in the artificial ground freezing project and optimize the distribution of freezing pipes. A coupled hydro-thermal model base on Darcy law and thermal balance equation has established and verified by the model test. The result shows that it can effectively improve the efficiency, reduce the completed freezing time and strength of frozen soil curtain. And the best distance which is all gratefully acknowledged between freeze pipe in upstream and section of original design freeze pipes is 75% of the distance of freeze pipes. In the end, the influence range of one pipe in upstream will be 3 similar to 4 times the distance of freeze pipes.