Analytical Method for Capped Pile–Soil Interaction considering the Load Action of Soil under the Pile Cap

Abstract

To study the pile–soil interaction mechanism of capped pile, an analytical method considering the load action of soil under the pile cap is proposed. The shearing displacement method is used to derive the lateral friction of pile body under the pile top load, and the Boussinesq solutions is used to derive the lateral friction of pile body considering the load of soil under the cap. The theoretical expressions of axial force and load-settlement curves are also achieved by means of establishing and solving the equilibrium differential equation of the pile body. Comparison of calculation results with the ordinary pile indicates that soil load under the pile cap reduces the lateral friction value; the influenced depth is about four times of the load action radius. The axial force and the load-settlement curve data are verified by a case history data. The results show that the computed data agree well with the measured data. The proposed method can direct the design of capped pile composite foundations.

Effects of Shear Characteristics of Anchoring Interface on Bearing Performance of Fully Grouted Bolts Based on Variable Controlling Method

“…Benmokrane et al [7] proposed a tri-linear bond-slip model by experiments to describe the shear behavior of the anchoring interface. Wu et al [8][9][10][11], Ren et al [12], Martín et al [13], Yan et al [14,15], Cao et al [16] and Chen et al [17] analyzed the pullout bearing capacity and force evolution characteristics of fully grouted bolts using a tri-linear bond-slip model. Lu et al [18,19] and Wu et al [20,21] analyzed the mechanical response of fully grouted bolts during the whole pullout process by adopting an improved tri-linear bond-slip model.…”

“…where τ p is the peak shear stress of the anchoring interface, d is the bolt diameter and L is the bolt bonding length. At present, the tri-linear bond-slip model of the anchoring interface is widely used for the analysis of the bearing performance of fully grouted bolts [7][8][9][10][11][12][13][14][15][16], as shown in Figure 1. It is not difficult to find that the indicators that determine the shear strength parameters of the anchoring interface include peak shear stress τ p , displacement u p at peak shear stress, residual shear stress τ f and displacement u f at residual shear stress.…”