Frost heaving deformation control of pile-anchor retaining structure of deep foundation pits in seasonal frozen soil regions

The frost heaving effects of pile-anchor retaining structure of deep foundation pits in seasonal frozen soil regions are easily neglected owing to the small temperature difference and the short frozen time. However, the collapse accidents of foundation pit caused by the influence of the frost heaving are not uncommon in some special circumstances. Firstly, the frost heaving mechanism of the foundation pit slope is described, and its calculation methods are summarized. Then based on the support of a deep foundation pit in Beijing, through monitoring the process of frost heaving in the winter of 2011, the implementation effects of the corresponding measures are analyzed. The influence factors of frost heaving on pile-anchor supporting system are summarized. The points for attention and the relevant prevention and treatment measures are proposed.