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| EXPERIMENTAL STUDY OF MECHANICAL BEHAVIOURS OF GROUTING-SCREW PILE INTERFACE |
| QIAN Jiangu1，2，CHEN Hongwei1，2，JIA Peng1，2，HUANG Maosong1，2，HU Yuyin3 |
| (1. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；3. Shanghai Construction(Group) General Co.，Ltd.，Shanghai 200080，China) |
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Abstract In order to understand the uplift bearing mechanism of a new-developed grouting-screw uplift pile，experimental investigation of mechanical behaviors of the pile-soil interface was carried out. A large-scale self-developed shear apparatus is used to measure the shear stress-displacement of pile-soil interface and to observe the corresponding failure mode. Experimental results show that the non-screw pile-soil interface generates a failure plane，whilst the screw pile-soil interface produces an arch-curvature failure surface. The screwing effect on the pile-soil interface behavior leads to an increase in cohesion and shear resistance. There exist some critical interval spaces between the two neighboring screws，where the largest arch-curvature failure surface is reached and the maximum soil-pile friction resistance is activated.
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Received: 02 May 2013
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2013, Vol. 32 
