Based on field tests on the new developed grouted gravel pile, the bearing performance, working mechanism and improvement effect on the adjacent ground were studied. The variation of pore water pressure, pile-soil stress ratio, ground surface settlement, layered settlement, and lateral displacement of improved zone adjacent to grouted gravel pile were monitored and presented in this paper. It indicates that the properties of adjacent soil surrounding both pile body and pile toe were improved due to the infiltration and cementation of cement grout, therefore both shaft friction and end bearing resistance were remarkably increased and apparently the ultimate bearing capacity was increased.
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