Investigation of factors influencing behavior of single geocell-reinforced bases under static loading

Geotextiles and Geomembranes (Impact Factor: 2.38). 12/2010; 28(6):570-578. DOI: 10.1016/j.geotexmem.2010.06.002


Geocell, one type of geosynthetics manufactured in the form of three-dimensional interconnected cells, can be used as a reinforcement to improve the behavior of base courses by providing lateral confinement to increase their stiffness and strength and reduce surface permanent-deformation. However, the use of geocells for base reinforcement is hindered by the existing gap between applications and theories. This study experimentally investigated the factors influencing the behavior (stiffness and bearing capacity) of single geocell-reinforced bases including shape, type, embedment, height of geocells, and quality of infill materials. Three of the four types of geocells investigated in this study were made of novel polymeric alloys using a new manufacturing technology. Repeatability and potential scale effects on test results were examined. The test results showed that the geocell placed in a circular shape had a higher stiffness and bearing capacity than that placed in an elliptical shape. The performance of the geocell-reinforced base depended on the elastic modulus of the geocell sheet. The unconfined geocell had a lower stiffness but a higher ultimate load capacity than the confined geocell. The benefit of the geocell was minimized when the infill material, quarry waste with apparent cohesion, was used as compared with the Kansas River sand without apparent cohesion. The single geocell-reinforced base had a lower stiffness and bearing capacity than the multiple geocell-reinforced base.

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    • "The beneficial ability of cellular geosynthetic mattress constructions to improve the bearing capacity and settlement of footings has been reported by several authors [11] [12] [13] [14] [15] [16]. Appropriate geocell reinforcement of soil, trench backfill or granular pavement construction over pipes seems likely to have the possibility of reducing the stress imposed on the pipe [17] [18]. "
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    ABSTRACT: A numerical simulation of laboratory model tests was carried out to develop an understanding of the behaviour of pipes in a trench prepared with 3-Dimensional reinforced (namely geocell-reinforced in the present study) sand and rubber-soil mixtures, under repeated loadings. The study reports overall performance of buried pipes in different conditions of pipe-trench installations and the influence of pipe stiffness on backfill settlements, stress distribution in the trench depth and stress distribution along the pipe's longitudinal axis. Good agreements between the numerical results and experimental results were observed. The results demonstrate that combined use of the geocell layer and rubber-soil mixture can reduce soil surface settlement and pipe deflection and eventually provide a secure condition for buried pipe even under strong repeated loads.
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    • "The interconnected cells in the geocell form a slab that behaves like a large pad that spreads the applied load over a wider area. Many researchers in the past have highlighted the advantages of using the geocells in geotechnical engineering applications (Moghaddas Tafreshi and Dawson, 2010; Pokharel et al., 2010; Lambert et al., 2011; Yang et al., 2012; Thakur et al., 2012; Sitharam and Hegde, 2013; Mehdipour et al., 2013; Hegde and Sitharam, 2014a, b; Moghaddas Tafreshi et al., 2014; Hegde et al., 2014; Indraratna et al., 2014). Tavakoli et al. (2013) highlighted the beneficial use of geocells in protecting the buried pipelines in their studies. "

    Geotextiles and Geomembranes 05/2015; · 2.38 Impact Factor
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    • "(Marto et al., 2013). Pokharel et al. (2010) stated that the concept of lateral confinement cell structures dating back to 1970. Geocells come in different shapes and sizes. "
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    ABSTRACT: In general, the tensile strength of the soil is poor. For this reason, the soil will need to be strengthened. The main objective of strengthening the soil mass is to improve stability, increase bearing capacity and reduce settlements and lateral deformation. There are several methods for improving the soil. One of the approaches is the use of geosynthetic materials. Geosynthetic is a well known technique in soil reinforcement. The use of geosynthetic three dimensions, can significantly improve the soil performance and reduce costs in comparison with conventional designs. In this paper, a review of experimental test carried out by different researchers for optimum depth of geocell in the sand had been made. The test results indicated that the inclusion of reinforcement in optimum depth of sand, decreased settlements and leading to an economic design of the footings.
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