Experimental Study on Pile‐Soil Interaction Response in Saturated Sand under Long‐Term Horizontal Cyclic Loading

Abstract

To explore the pile-soil interaction response in saturated sand under long-term horizontal cyclic loading, a series of indoor 1 g model tests were carried out with self-made loading equipment. In this paper, the self-made loading system and test program are introduced firstly. Then, the long-term horizontal cyclic loading-induced pile top cumulative displacement, the rotation angle, the mono-pile horizontal cyclic stiffness, the cyclic p-y curve, the pore water pressure, the soil settlement, and cracks around mono-pile are fully studied. Based on the experimental results, the pile-soil interaction response shows a two-stage characteristic with the change in cycle (N), and the short-term effects of horizontal cyclic loading are greater than the long-term effects. In the first 1000 cycles, the cumulative displacement of pile top, the rotation angle of mono-pile, and the pore water pressure could reach more than 90% of the final value. In addition, the cyclic p-y curve obtained by the test is generally smaller than the p-y curve calculated from the API specification, and the soil near the mono-pile will settle with annular cracks under the cyclic loading.

Study on the Damage Mechanism of Bank Slope-Bridge Pile Foundation Interaction under Reservoir Water Level Cycle

“…Sawant et al [15] further investigated the influence of the pro-slope distance and slope ratio on the pile force deformation characteristics by numerical simulation and found that the pile top displacement and pile bending moment were proportional to the slope ratio. Xing et al [16] analyzed the pile displacement deformation under the reservoir water level cycle based on the stiffness decay model and soil strength degradation model in conjunction with engineering practice and noted that the cumulative pile displacement continuously increased with the number of water level cycles. Liu [17] established a bank slope-bridge pile interaction model under the condition of rising reservoir water levels and found that with the rising water level, the continuous deformation of the soil around the pile generated a transverse shear force on the pile foundation, and the pile displacement continuously increased.…”