Experimental Study On The Load Transfer Characteristic Of Bored Pile In The Condition Of Artificial Freezes Soil Melt

Artificial freezing method was used more and more widely in the mine shaft sinking engineering, such projects often encountered the problems that pile foundation of tower was constructed in the artificial frozen soil, but it was studied at home and abroad less. If we got through the research of the load transfer behavior of bored concrete pile after artificial permafrost melting, we can provide a reference for this kind of pile foundation design and construction.Based on the background of a certain mine project in Inner Mongolia, this paper studied the load transfer behavior of bored concrete pile under the condition of artificial frozen soil melt. Experiment designed the scheme of model pile, model groove, filled and controlled of the soil around the pile, soil freeze-thaw and temperature control, low strain test of pile, static load test of single pile, and test of the internal force of pile body. According to the test scheme design, two groups model piles were bored including normal temperature and freeze-thaw, simulated the dense saturated sand foundation in two different states, and freeze-thaw piles were pouring and curing 28 days in artificial freezing soil, then the soil around piles was thawed; normal piles were pouring and curing 28 days in normal temperature saturated sand foundation. Then the single pile static load test was conducted on the two groups of piles. It obtained the influence that artificial frozen saturated medium sand melts for the load transfer behavior of bored concrete pile,through analyzed experimental data of internal force of pile body test element.The results of the research show that, artificial frozen saturated medium sand melt will affected to the load transfer behavior of bored concrete pile, it will led to a certain amount loss of the pile tip resistance and pile side resistance,and caused by the change of the pile axial force and pile side friction resistance distribution. On the basis of research results, this article puts forward some suggestions and measures for design and construction of this kind of pile foundation.