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. An attempt is made in this paper to improve this using a non-dimensional model based on simplified ground consisted of two layers of cohesive soils. A hyperbolic p–y model is adopted to consider non-linear 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 three-dimensional finite-element analyses. The application of the non-dimensional solutions indicates that it can increase the efficiency of the preliminary pile design.
Highlights
Mass movements are catastrophic events which threaten both infrastructure and human lives
It is commonly concluded that the soil arching between adjacent piles can be maintained when the pile spacing is smaller than a limit value, often referred as about 4 times the pile diameter
The objectives of this study are: (a) to reveal the evolution of pile response with the sliding soil displacement and the relative pile stiffness, and explore the boundary between mode B and C; (b) to demonstrate the efficacy of the proposed approach by the satisfactory result that it achieves in reproducing the more complex 3D finite-element analyses; and (c) to show the ability of the proposed method to facilitate the design of piles as a mitigation structure
Summary
Mass movements are catastrophic events which threaten both infrastructure and human lives. The main factor influencing the soil arching effect is the axis-to-axis pile spacing This factor has been studied by many research groups, using various approaches (Chen & Martin, 2002; Liang & Zeng, 2002; Durrani et al, 2008; Yoon & Ellis, 2009; Ellis et al, 2010; Kourkoulis et al, 2011; Li et al, 2013). From these works, it is commonly concluded that the soil arching between adjacent piles can be maintained when the pile spacing is smaller than a limit value, often referred as about 4 times the pile diameter.
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