FIELD TEST STUDY OF NEW-TYPE SOIL DISPLACEMENT SCREW PILE
(1. Central Research Institute of Building and Construction Co.，Ltd.，China Metallurgical Group Corporation，
Beijing 100088，China；2. China Jingye Engineering Technology Co.，Ltd.，Beijing 100088，China)
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.
李志毅1，2，刘 钟1，2，赵琰飞1，2，张慧东1，2. 新型螺旋挤土灌注桩现场试验研究[J]. 岩石力学与工程学报, 2011, 30(2): 411-417.
LI Zhiyi1，2，LIU Zhong1，2，ZHAO Yanfei1，2，ZHANG Huidong1，2. FIELD TEST STUDY OF NEW-TYPE SOIL DISPLACEMENT SCREW PILE. , 2011, 30(2): 411-417.
BOTTIAU M，CORTVRINDT G. Recent experience with the omega-pile[C]// Proceedings of the 5th International Conference and Exhibition on Piling and Deep Foundations. Bruges，Belgium：[s.n.]，1994：111-117.
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2011, Vol. 30 
