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Abstract Due to the high bearing capacity，high productivity of installation and non-pollution on site，such soil displacement screw(SDS) pile has been widely applied in many countries. But there is no successfully engineering application report in China yet. To study soil compaction effect，bearing characteristics，distribution of side friction resistance of SDS pile and the difference between SDS pile and cement flyash gravel(CFG) pile，two field tests are carried out in a site in Beijing. Test results show that the surface vertical displacement during construction is mainly completed from the beginning of auger drilling to the auger′s compaction part squeezing into the soil wholly；then the surface vertical displacement tends to stabilize. The soil compaction effect is mainly completed within 4 times the pile diameter；and the higher the soil compressibility is，the larger the soil compaction scope is. The ultimate bearing capacity of SDS pile can be increased by 30%–50% compared with CFG pile at the same settlement of the pile top.
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Received: 06 August 2010
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2011, Vol. 30 
