Experimental study on pile driving process of grouted enlarged toe pile
The transparent soil model test was conducted for the construction process of a new grouted enlarged-toe (GET) precast pile. The end resistance and side friction resistance can be significantly improved because of the expansion of the enlarged toe structure at the end and the solidification of the cement slurry around the pile,which makes the new pile type have higher uplift resistance compared with traditional prefabricated piles. Then the transparent soil material Laponite RD was used to simulate the construction environment of soft clay,and comparative model tests were conducted on conventional precast piles,precast piles with enlarged toe,and grouted enlarged-toe (GET) precast pile. Particle image velocimetry (PIV) technology was used to visualize the post processing of the pile construction process in order to explore the mechanism of the pile formation process of the new pile and provide theoretical support for the further promotion and application. Results showed that the distribution of soil displacement field in the construction of new pile types was different from that of conventional prefabricated piles,showing a vortex shape. The influence range was reduced by the enlarged toe structure and synchronous grouting technology of surface and internal construction disturbances on the soil surrounding pile,which is very beneficial for the construction of squeezed soil pile foundations.
万方数据
