Experimental Study on Bearing Features of Bored Pile under Non-Refreezing Condition in Permafrost Region

Facing the problems such as pile cap and bridge pier construction, super structure construction, time limit for construction etc, a key problem is to solve the bearing capacity and deformation of large diameter bored pile under non-refreezing condition. In-situ experiment was carried out at high-temperature in fine-granular frozen soil region of Qinghai-Tibet plateau. On the basis of ground temperature data and in-situ experimental data, the authors analyzed the shaft resistance and tip resistance of the pile under different ground temperature conditions. In the meantime, the authors also analyzed the deformation features of non-refreezing large diameter bored pile in permafrost. The experimental results can be used as some guides and references in the process of pile foundation construction.