Numerical Analysis of Bearing Capacity of Strip Footing Built on Geogrid-Reinforced Sand Slope Over Soft Clay Layer (rev
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RESEARCH ARTICLE-CIVIL ENGINEERING
Numerical Analysis of Bearing Capacity of Strip Footing Built on Geogrid‑Reinforced Sand Slope Over Soft Clay Layer (revised version 3) Ahmed Hamidi1 · Khelifa Abbeche1 Received: 13 January 2020 / Accepted: 14 May 2020 © King Fahd University of Petroleum & Minerals 2020
Abstract The paper presents the numerical investigations into the ultimate bearing capacity of the rigid strip footing built on geogridreinforced sand over soft clay slope, by means of a detailed parametric study based on a finite element modeling. The parameters investigated are the effect of the vertical distance ratio between consecutive layers (h/B), depth ratio of the topmost layer of geogrid (u/B), number of geogrid layers (N) and the effective depth ratio of reinforcement (H/B), where B is the footing width, and also the effect of friction angle (φ), density of the sand (loose, moderately dense and dense) and the angle of the slope inclination (β). A series of finite element analyses were performed on strip footing using the two-dimensional plane strain model using the computer code Plaxis 2D. The soil was represented by nonlinear Mohr–Coulomb model and Cam clay, which is an elastoplastic hyperbolic stress–strain model, while reinforcement was represented by elastic elements. The results illustrated that by increasing the number of reinforcement sheets and the friction angle, the bearing capacity increased, and by decreasing the slope angle, the depth of reinforcement decreased. The improvement in the bearing capacity of the strip footing on a reinforced slope was found to be strongly dependent on the slope angle and the friction angle of the sand. The best improvement in the bearing capacity was noticed if the spacing between the reinforcement layers (u/B) and (h/B) is small. Numerical results obtained from a series of finite element model tests have been presented and discussed in the paper. Keywords Bearing capacity · Geogrids · Sand · Slope · Soft clay and Strip footing List of symbols BCR Bearing capacity improvement factor iβ Coefficient of reduction in bearing capacity qur Ultimate bearing capacity of reinforced soil qu Ultimate bearing capacity of unreinforced soil N Number of reinforcement layers H Total depth of reinforcement L Length of reinforcement B Foundation width u Top layer spacing, i.e., spacing between top layer of reinforcement and bottom of footing h Vertical spacing between reinforcement layers
* Ahmed Hamidi [email protected] Khelifa Abbeche k.abbeche@univ‑batna2.dz 1
Department of Civil Engineering, Faculty of Technology, University of Batna 2, Batna, Algeria
NC Factor of cohesion If Friction angle factor
1 Introduction Stabilizing a soil, in the broad sense of term, consists of the soil property modification to improve its technical performance. In the last several years, the soil reinforcement below superficial foundations has been applied to improve the bearing capacity and the settlement of the foundations; in this aspect, several research works were do
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