注浆成型螺纹桩接触面特性试验研究

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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.

Key words： pile foundations grouting-screw pile uplift pile interface large-scale direct shear test

Received: 02 May 2013

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/I9/1744

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