Limiting equilibrium method for slope/drilled shaft system

Abstract

SUMMARYThe use of drilled shafts to stabilize an unstable slope has been a widely accepted practice. There are two basic design and analysis issues involved: one is to determine the global factor of safety of the drilled shafts stabilized slope and the other one is to determine the design earth thrust on the drilled shafts for structural design of the shafts. In this paper, a limiting equilibrium method of slices based solution for calculating global factor of safety (FS) of a slope with the presence of a row of drilled shafts is developed. The arching mechanisms due to the presence of the drilled shafts on slope were taken into account by a load transfer factor. The method for calculating the net force applied to the drilled shaft from the soil mass was also developed. The interrelationships among the drilled shaft location on the slope, the load transfer factor, and the global FS of the slope/shaft system were derived utilizing the developed numerical closed-form solution. An illustrative example is presented to elucidate the use of the solution in optimizing the location of the drilled shafts on slope to achieve the desired global factor of safety of the slope/shaft system.

Evaluation of the Lateral Forces Acting on Stabilizing Piles Considering the Resistance of the Lower Zone of A Landslide in the Three Gorges Reservoir, China

“…The lateral forces from the present study and those of Yamin and Liang [24] and Zhou et al [25] were also compared in Table 5. The proposed method was developed not only to estimate the upper lateral forces acting on a stabilizing pile but also the lower lateral resistance forces.…”

“…A conventional simplified Bishop slip circle approach can be employed to analyze the slope stability and the resisting moment generated by a pile at the depth of the sliding surface. The method can account for the effects of the soil arching mechanism [24]. Zhou et al [25] considered the influence of reservoir water fluctuations, rainfall amounts, and shear strength of a slip surface on the lateral force.…”

Three‐dimensional finite element study of arching behavior in slope/drilled shafts system

“…Both objectives have not been dealt with in the existing literature. It should also be noted that the numerical solution in the framework of limiting equilibrium method, utilizing the quantified load transfer factor derived in this paper, is presented in a companion paper [28] for evaluating FS of a slope stabilized with a row of drilled shafts.…”

Application of the Strain Wedge Model in Soil-pile Interaction Analysis of Pile-stabilized Slopes

“…Over the last few years, the numerical methods have been used by several researchers (Chow 1996, Jeong et al 2003, and Yamin and Liang 2010 to investigate soil-pile interaction in pile-stabilized slopes. These methods are becoming increasingly popular because they offer the ability to model complex geometries, 3D soil-structure phenomena, such as pile group effects, and soil and pile non-linearity.…”