Influence of the α Angle of Flexible Concrete Expanded-Plate Piles on the Bearing Capacity under Horizontal Load

Abstract

Concrete expanded-plate piles have significant advantages in the bearing capacity, settlement, and construction period. The added bearing expanded plate is the key reason for their many advantages; moreover, the slope angle (α angle: the maximum diameter of the bearing expanded plate and the angle formed on the plate) of the bearing expanded plate is the main factor to control the longitudinal symmetry. However, the concrete expanded-plate piles in practical engineering do not exist in a rigid body state, and elastic deformation will occur under variable engineering conditions. In addition, the research in this paper mainly focuses on a flexible concrete expanded-plate pile (F-CEP pile). The flexible pile mentioned in this paper refers to the bending deformation of the pile body under horizontal load, which produces large pile top displacement. This study uses the two methods of small-scale half-plane pile model test and finite element simulation analysis of ANSYS, after referring to the equipotential pile test at the actual site. In this paper, the variation law of the displacement curve and the failure law of the soil around the pile under the horizontal force when the α angle changes are analyzed, and the calculation model of the bearing capacity of F-CEP pile under the α angle change is put forward. This research aims to verify the reliability of existing research and provides strong support for the application, promotion, design, and research of F-CEP piles in construction engineering.

Effects of disc overhang diameter on the uplift bearing capacity of new-type concrete expanded-plate pile groups

“…New-type concrete-expanded plate (NT-CEP) piles are variable-section grouting piles 1 – 3 with low construction costs, high bearing capacities, and small settlements 4 – 6 ,depicted in Figs. 1 and 2 .They are different from ordinary equal diameter piles, and the ultimate tensile bearing capacity of single plate piles is 178% higher than that of equal diameter piles.Their use in engineering is increasing 7 , 8 ; however, previous studies have mainly focused on single and double NT-CEP piles,with most studies conducted by the research group of this paper 9 – 11 and few have considered pile groups 12 , 13 . Therefore, a systematic investigation of NT-CEP pile groups is required.…”