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Abstract To accurately know the refreezing time and capacity of the bridge bored pile constructed in polygonal permafrost regions，two test sites were chosen. Within each site，two 15 m test piles were built. The temperature monitoring system was established in one of the two sites to record and monitor the pile refreezing process. Based on the refreezing condition，static load and dynamic load tests were performed to determine the bearing capacity of the pile. Test results indicate that the mean permafrost temperature is －1.9 ℃. The trend of temperature change within the pile in refreezing process is similar to that of the permafrost temperature change 1 m beside the pile，which indicates that the difference of temperature change is smaller than 0.1 ℃. The calculated pile capacity fits well with the testing data by introducing the refreezing pile lateral frictional parameter to modify the soil mechanical model. The capacity error obtains from static load test and dynamic load test is 3.91%，which matches the test results. This reacher provides an evidence to design and test the pile foundations in permafrost areas.
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2015, Vol. 34 
