Non-dimensional solutions for the stabilising piles in landslides in layered cohesive soils considering non-linear soil–pile interactions

Abstract

The pile response is of great importance to the effectiveness of a row of piles used as a landslide mitigation method. However, the current classifications of the pile responses and failure modes do not consider the effects of soil displacement and the relative pile rigidity. This paper attempts to improve this using a nondimensional model based on a simplified ground consisted of two layers of cohesive soils. A hyperbolic p-y model is adopted to consider nonlinear soil reactions. The calculations of three case histories show that the proposed model predicts the pile responses well. The dependencies for obtaining a pile response with maximum pile resistance have been identified and the influencing factors have been examined. The efficacy of the proposed approach has been demonstrated by the satisfactory result that it achieves in reproducing the more complex 3D finite-element analyses. The application of the nondimensional solutions indicates that it can increase the efficiency of the preliminary pile design.

Practical Considerations in the Design of Passive Free Piles in Sliding Soil

“…To overcome this limitation, a model of rigid passive piles was proposed, embedded in a landslide with both subgrade reaction modulus and strength linearly increasing with depth [16,17]. In addition, a model of flexible piles embedded in cohesive layered soils was proposed, where both the subgrade reaction modulus and the strength are constant with depth [18]. The purpose of these studies is to analyse the pile response with regard to the soil movement, so that the mobilised pile strength can be evaluated not only at the ultimate but also at the intermediate states.…”