Effect of the Geotextile Arrangement on the Bearing Capacity of a Strip Footing
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(2020) 6:36
ORIGINAL PAPER
Effect of the Geotextile Arrangement on the Bearing Capacity of a Strip Footing Ahad Ouria1 · Arsam Mahmoudi1 · Hamid Sadeghpour1 Received: 11 April 2020 / Accepted: 19 July 2020 © Springer Nature Switzerland AG 2020
Abstract A series of laboratory tests were conducted to investigate the effect of the three-dimensional arrangement of geotextile strips on the load-bearing capacity of a strip foundation on sand reinforced by geotextile strips. The load-bearing capacity of a 24.5 × 7.5 × 1.5 cm strip foundation on a 90 × 25 × 30 cm sandbox reinforced with three different types of geotextiles in seven different forms of three-dimensional arrangement was studied. Geotextile arrangements consisted of one, two, and three layers of continuous strips with 1 cm vertical spacing, two and three strips of 5 cm wide reinforcements in 5 cm horizontal intervals beneath each other in the vertical plane, and 5 cm shifted in the horizontal plane. The results indicate that the improvement of the bearing capacity of the foundation on reinforced soil per unit width of the reinforcements is the maximum for one-layer continuous reinforcement. The bearing capability of the footing per unit width of the reinforcements decreases by increasing the number of reinforcements layers. For multi-layer reinforced models, using reinforcement strips in interval arrangements increases the effectiveness of the geotextile on the improvement of the bearing capacity of the footing. Using a proper threedimensional arrangement of reinforcement strips results in a similar ultimate bearing capacity with approximately 50% less reinforcement when compared to continuous multi-layer reinforcement arrangement. Keywords Geotextile · Strip footing · Bearing capacity · Arrangement · Laboratory model · Reinforced soil
Introduction The implementation of geosynthetics in the soil mass improves the strength parameters of the soil [1]. Mechanical soil stabilization methods are extensively used to improve the stability and performance and of pavements, retaining walls, foundations, and embankments [2–11]. Geosyntheticreinforced earth structures are essential in sustainable development [12]. The use of properly designed reinforcement elements within a soil mass helps it to withstand its weight and external loads [13]. The stability of a geosynthetic-reinforced earth structure depends on three criteria, including axial failure of the reinforcement elements, their pullout, and * Ahad Ouria [email protected]; [email protected] Arsam Mahmoudi [email protected] Hamid Sadeghpour [email protected] 1
Civil Engineering Department, University of Mohaghegh Ardabili, Ardabil, Iran
sliding [1]. Based on these criteria, the number of reinforcement layers, their length, their tensile capacity, and the interface parameters of the soil and the reinforcement in addition to the embedment depth are effective parameters on the loadbearing capability of a footing [13–19]. The additional layers of reinforcements enhance the bearing capability of
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