Model Testing of Encased Stone Column Composite Foundations under Traffic Loads

Abstract

In soft soil foundations, geogrid encased stone column composite foundation technology has been widely applied and developed in recent years due to its efficient treatment. In this study, eight groups of laboratory model tests were performed in a large-scale testing tank to investigate the bearing mechanism and stress characteristics of the composite foundation of geogrid encased stone columns under traffic loads with different cyclic load ratios. The stress at the bottom of the stone column and settlement of the composite foundation were measured and analysed. The test results show that cyclic shearing will cause the rearrangement of the soil particles at the column-soil interface, which will cause changes in the face pressure and effective stress state of the column-soil boundary. The cyclic load has a substantial influence on the accumulation settlement of the composite foundation and the development of the lateral stress state of the column. Based on the test results, the development law of the cumulative settlement is summarized, and the change mechanism of the column stress state is analysed and discussed.

Three-Dimensional Discrete Element Analysis of Bearing Characteristics of Concrete–Cored Sand–Gravel Pile Composite Foundation under Cyclic Dynamic Load

“…Li Tianbao et al [12] carried out an indoor model test of a rigid-flexible, pile-bearing, reinforced bedding composite foundation and compared and analysed the bearing properties of a rigid-flexible pile and flexible pile-bearing reinforced bedding composite foundation under cyclic loading. Yuan et al [13] carried out an indoor model test of a reinforced gravel pile composite foundation under multiple sets of traffic loads and analysed the effect of the cyclic loading ratio on the bearing properties of a reinforced gravel pile composite foundation. Zhu et al [14,15] investigated the bearing characteristics of a pile-soil composite foundation under long-term cyclic loading by indoor dynamic modelling tests.…”

Settlement Analysis of a Sandy Clay Soil Reinforced with Stone Columns

“…Therefore, alternative methods that do not involve massive excavation but can reinforce the soil in place have come to be preferred. Among them, the use of stone columns has gained attention in the geotechnical community [8][9][10].…”

“…Various researchers [20][21][22] analyzed the behavior of stone columns in the soft soil using the finite-element method and investigated the role of various parameters, such as the depth ratio, the column diameter and stiffness, and the soil's friction angle and Poisson's ratio. A study [8] concluded that the stiffness of the stone column material is a critical parameter controlling the settlement of the treated soil, observing that stiffer columns are associated with smaller vertical and lateral displacements. Finally, it was also pointed out [23] that stone columns can be used to reduce the liquefaction potential.…”