关键词: 地基处理, PHC管桩, 现场试验, 大型炼厂

Abstract:

The soft foundation treatment of large-scale refinery is very complex. In view of this condition, a series of in-situ tests of PHC pipe pile, including low/high strain dynamic test, horizontal and compressive static load test of single pile, were carried out. Based on results of low/high strain test, the quality and completeness of the pile was analyzed. The bearing capacity of single pile was verified by results of high strain test and static load test. And some economical comparison was carried out among various piles of different diameter. The results of static load test showed that the bearing capacity of single pile has reached the standards; when the diameter of PHC pipe pile is 400mm, the ultimate bearing capacity of single pile is affected by pile length greatly; however for PHC pipe pile of 500 mm or 600 mm, the influence from pile length is smaller; the ultimate bearing capacity of single piles that have the same length increases with pile diameter, and the increasing forms are different among piles of various length; the horizontal bearing capacity of PHC pipe pile with concrete core is 50% larger than that of pile without concrete core; In economic terms, the best choice for compressive PHC pipe pile is 500 type, the bearing strata of PHC pipe piles should be intensively-weathered to medium-weathered mudstone or completely-weathered to medium-weathered sandstone.

Key words: foundation treatment, PHC pipe piles, in-situ test larger-scale refinery