LAUSR

To investigate the groundwater influence on the performance of artificial freezing wall, especially the higher salt concentration in groundwater, a double-pipe seepage-freezing model test system was established to analyze the effects of different seepage velocities and salt concentrations on the formation of frozen walls. Results show that the frozen wall is uneven under seepage, and the thickness of the upstream frozen wall is small when the downstream is large. The salt concentration affects the development of the frozen wall, and the thickness of the frozen wall decreases with the increase of salt concentration. The maximum reduction rate of the frozen wall thickness is about 80.4% in upstream and 59.5% in downstream. As the flow velocity and salt concentration increase during the freezing process, the decrease rate of the seepage flow slows down, which in turn makes the freezing front expand slowly and closure time of the frozen wall extends. The conclusions obtained in this study can provide a theoretical reference for the design and construction of the similar engineering.