Effect of geosynthetic reinforcement on the bearing capacity of strip footing on sandy soil
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Effect of geosynthetic reinforcement on the bearing capacity of strip footing on sandy soil L. Al‑Subari1 · M. Hanafi2 · A. Ekinci1 Received: 27 April 2020 / Accepted: 24 July 2020 © Springer Nature Switzerland AG 2020
Abstract Due to the increasing presence of problematic soils, expansive clays and highly compressive sand engineers are using a verity of soil improvement techniques to treat such soils. While geosynthetics are extensively used for improving soil characteristics in roads, pavements and embankments, it can also be used to increase the lack of bearing capacity of residential housing or lightweight structures constructed on sandy soils. In order to simulate site conditions in the laboratory environment, a laboratory-scale testing platform has been manufactured to assess the behaviour of geosynthetics reinforced and un-reinforced strip footing. The first group of tests were performed on the unreinforced compacted sandy soils with different densities where the other group of tests were carried out in the soil that has been reinforced individually with three different types of geosynthetic materials having distinct tensile strengths. Furthermore, interface direct shear tests and consolidated undrained triaxial tests have been carried out to determine the shear parameters which is directly influencing the bearing capacity a strip footing. Geosynthetic reinforcement has considerably enhanced the mechanical behaviour of sandy soil in regarding the type of geosynthetic. Furthermore, it was observed that coir geosynthetic has provided increased interfacial friction when compared to other geosynthetic types and improved bearing capacity. Moreover, the adopted testing method found to represent well the behaviour of such materials in the laboratory environment. Keywords Bearing capacity · Geosynthetics · Lightweight constructions · Sand · Ground engineering
1 Introduction Sandy soils are located all around the world, and it has been increasingly used for construction. However, many problems are associated with the use of sandy soils in structures such as stability of slopes, bearing capacity of foundations, and liquefaction. Many techniques were developed to overcome these problems and to enhance the ground condition [1]. Among these methods, reinforcing soil beneath the foundation is a typical practice used to improve the bearing capacity and reduce the settlement of foundations.
Practice of improving unsuitable soil for structural use has a long history. Babylonians in 2300 BC at ancient Mesopotamia embedded woven reed mats in sand between straw clay bricks to form shallow foundations and build temples, dykes, houses etc. on compressible soils [2]. Furthermore, in ancient Greece (about 400 BC) isolated pad footings have been used to overcome differential settlement. Pad foundation excavated up to 2.6 m depth was back filed with layers of 0.2 m thick limestone gravel mix [3]. The modern practice started in the middle of the 70 s by Binquet and Lee [4] where authors assess the behaviour of sandy soil bearing
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