Study About the Effects of Pile Spacing on the Performance of Pile Group Under Composite Loads, Adjacent Structure Loads, and Bending Moment in Sand

Abstract

SUMMARYPile group is a particular type of deep foundations which is designed and installed as the ultimate solution to foundation construction, load transition to the resistant subsurface layers, providing lateral resistance, and overcoming the poor performance of surface soils. Pile design should be done with respect to structural consideration, the load-carrying capacity of the surface and surrounding soil, settlement, and constructional, technical and environmental problems. Piles are mostly and widely utilized in coastal and offshore structures, and sustain vertical and lateral loads. Considering the imposed loads on structure, the effect of these loads on the pile behavior should be analyzed with an appropriate method. In this study, a 4x4 pile group with piles of 100-cm diameter and center-to-center spacing of 2, 3, 4 times the diameter is modeled using the Plaxis 3D foundation program, which uses the finite element method, and the Mohr-Coulomb model, and the behavior of piles subjected to loading, driven in sand, are investigated. Taking the achieved results, the mechanism of the pile group behavior under composite loads, adjacent structure loads, and bending moment are calculated, and displacement in the x-direction, y-direction and along the length, the bending moment and the axial force for each pile within a distance of 2, 3, 4 times the diameter are attained.

Review of the Double-Row Pile Supporting Structure and Its Force and Deformation Characteristics

“…In this way, the problem soil interaction is weakened, and the calculation model cannot truly and effectively the interaction between the whole pile supporting structure and the soil between p Under the action of horizontal load, with the increase in pile displacement, around the pile will also be compressed, and the soil in some large displacemen enters a plastic state, and the soil resistance will not increase with the increase in di ment. Based on the numerical modeling, the nonlinear expression of the pile displa and the soil reaction force is obtained by the p-y curve method and the proportion ficient method, which can well reflect the effect of the double-row pile crown [138,139]. On the whole, the calculation model based on the soil arch effect and th kler foundation model can obtain more accurate simulation results and is widel However, these three classical calculation models do not take the pile row sup structure as a whole space system to calculate the whole, and the relationship betw deformation coordination effect of the pile, crown beam, and connected beam an pressure needs to be further studied.…”

“…Based on Wu et al [60], Deng et al [140], and other scholars who established a Under the action of horizontal load, with the increase in pile displacement, the soil around the pile will also be compressed, and the soil in some large displacement areas enters a plastic state, and the soil resistance will not increase with the increase in displacement. Based on the numerical modeling, the nonlinear expression of the pile displacement and the soil reaction force is obtained by the p-y curve method and the proportional coefficient method, which can well reflect the effect of the double-row pile crown beam [138,139]. On the whole, the calculation model based on the soil arch effect and the Winkler foundation model can obtain more accurate simulation results and is widely used.…”